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Mathematical Theory and Modeling www.iiste.org
ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online)
Vol.2, No.4, 2012
67
A Family of Implicit Higher Order Methods for the Numerical
Integration of Second Order Differential Equations
Owolabi Kolade Matthew
Department of Mathematics, University of Western Cape, 7535, Bellville, South Africa
*E-mail of the corresponding author: kowolabi@uwc.ac.za; kmowolabi2@gmail.com
Abstract
A family of higher order implicit methods with k steps is constructed, which exactly integrate the initial
value problems of second order ordinary differential equations directly without reformulation to first order
systems. Implicit methods with step numbers }6,...,3,2{∈k are considered. For these methods, a
study of local truncation error is made with their basic properties. Error and step length control based on
Richardson extrapolation technique is carried out. Illustrative examples are solved with the aid of
MATLAB package. Findings from the analysis of the basic properties of the methods show that they are
consistent, symmetric and zero-stable. The results obtained from numerical examples show that these
methods are much more efficient and accurate on comparison. These methods are preferable to some
existing methods owing to the fact that they are efficient and simple in terms of derivation and computation
Keywords: Error constant, implicit methods, Order of accuracy, Zero-Stability, Symmetry
1. Introduction
In the last decade, there has been much research activity in the area of numerical solution of higher order
linear and nonlinear initial value problems of ordinary differential equations of the form
10
)1()(
)(,0)...,,,,( −
−
== m
mm
tyyyytf η
n
ytm ℜ∈= },{,...,2,1
(1)
which are of great interest to Scientists and Engineers. The result of this activity are methods which can be
applied to many problems in celestial and quantum mechanics, nuclear and theoretical physics, astrophysics,
quantum chemistry, molecular dynamics and transverse motion to mention a few. In literature, most models
encountered are often reduced to first order systems of the form
],[,)(),,( 00 batytyytfy ∈==′
(2)
before numerical solution is sought [see for instance, Abhulimen and Otunta (2006), Ademiluyi and
Kayode (2001), Awoyemi (2005), Chan et al. (2004)].
In this study, our interest is to develop a class of k-steps linear multistep methods for integration of general
second order problems without reformulation to systems of first order. We shall be concerned primarily
with differential equations of the type
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Vol.2, No.4, 2012
68
1,0,),,(],,[,)(),,,( 0
)(
=ℜ∈′∈=′=′′ myytfbattyyytfy n
m
m
η
(3)
Theorem 1 If f(t,y), f:Ʀ x Ʀ → Ʀ is defined and continuous on all tЄ[a, b] and
∞<<∞− y and a constant
L exist such that
**),(),( yyLytfytf −<−
(4)
for every pair (t, y) and (t, y*) in the quoted region then, for any y0ЄƦ the stated initial value problem
admits a unique solution which is continuous and differentiable on [a, b].
Efforts are made to develop a class of implicit schemes of higher step-numbers with reduced functions
evaluation for direct integration of problem (3) for k=2,3,... ,6.
The remainder of the paper is organized in the following way. Under materials and methods, construction
of the schemes for approximating the solutions of (3) is presented with the analysis of their basic properties
for proper implementation. Some sample problems coded in MATLAB are equally considered. Finally,
some concluding comments are made to justify the obtainable results and suitability of the proposed
schemes on comparisons.
2. Materials and methods
2.1 Construction of the schemes: The proposed numerical method of consideration for direct integration of
general second order differential equations of type (3) is of the form
)...(... 110
2
11110 knknnknknnkn fffhyyyy ++−+−++ +++++++= βββααα ,
(5)
taken from the classical K-step method with the algorithm
∑ ∑= =
++ ==
k
j
k
j
jnjjnj nfhy
0 0
2
...,1,0,βα
(6)
where yn+j is an approximation to y(xn+j) and fn+j =f(xn+j, yn+j, y’n+j). The coefficients αj
and βj
are constants
which do not depend on n subject to the conditions
0,1 00 ≠+= βααk
are determined to ensure that the methods are symmetric, consistent and zero stable. Also, method (4) is
implicit since βk≠0.
The values of these coefficients are determined from the local truncation error (lte)
)]...(...[ 110
2
11110 knknnknknnknkn fffhyyyyT ++−+−+++ +++++++−= βββααα
(7)
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generated by one-step application of (5) for numerical solution of (3). Clearly, accuracy of these
schemes depend on the real constants αj
and βj
. In attempt to obtain the numerical values of these constants,
the following steps were adopted;
Taylor series expansion of kny + , 121 .,..,, −+++ knnn yyy and knnn fff +++ .,..,, 21 about the point
),( nn yt yields
)(0
!
)(
...
!2
)(
)( )1()()2(
2
)1( +
+ +++++= pp
n
p
nnnkn hy
p
kh
y
kh
ykhyT
}
)!1(
)(
0
!
)(
...
!2
)(
)({ )1(
1
)()2(
2
)1(
1
0
+
+−
= +
+++++− ∑ p
n
p
p
n
p
nnn
k
j
j y
p
jh
y
p
jh
y
jh
yjhyα






−
+
−
++++− +
−−
=
∑ )1(
1
)(
2
)4(
2
)3()2(
0
2
)!1(
)(
0
)!2(
)(
...
!2
)(
)( p
n
p
p
n
p
nnn
k
j
j y
p
jh
y
p
jh
y
jh
yjhyh β
(8)
Terms in equal powers of h are collected to have
+







−−+







−+







−= ∑ ∑∑∑
−
= =
−
=
−
=
+
)2(2
1
0 0
22
)1(
1
0
1
0 !2
)(
!2
1 n
k
j
k
j
jjn
k
j
jn
k
j
jkn yh
jk
hyjkyT βααα
++







−− ∑∑ =
−
=
...
!3
)(
!3
)3(3
0
1
0
33
n
k
j
j
k
j
j yhj
jk
βα
( )1)(
0
21
0
0
)2(!
)(
!
+
=
−−
=
+







−
−− ∑∑ pp
n
p
k
j
j
pk
j
j
pp
hyh
p
j
p
j
p
k
βα
(9)
Accuracy of order p is imposed on Tn+k to obtain Ci=0, 0 ≤ i ≤ p. Setting k=2(3)6, j=0(1)6 in equation (9),
the obtainable algebraic system of equations are solved with MATLAB in the form AX=B for various
step-numbers to obtain coefficients of the methods parameters displayed in Table 0.
Using the information in Table 0 for k=2(3)6 in (5), we have the following implicit schemes
)10(
12
2 12
2
12 nnnnn fff
h
yyy n
+++−= ++++
(10)
P=4, Cp+2 ≈ -4.1667x10-3
which coincides with Numerov’s method of Lambert (see for more details in [7])
)99(
12
33 123
2
123 nnnnnnn ffff
h
yyyy n
−−+++−= ++++++
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(11)
P=5, Cp+2 ≈ -4.1667x10-3
)8188(
12
464 1234
2
1234 nnnnnnnnn fffff
h
yyyyy n
−+−++−+−= ++++++++
(12)
P=6, Cp+2 ≈ -4.1667x10-3
)726267(
12
510105
12345
2
12345
nnnnnn
nnnnn
ffffff
h
yyyyyy n
−−+−++
+−+−=
+++++
+++++
(13)
P=7, Cp+2 ≈ -4.1667x10-3
)63352336(
12
61520156
123456
2
123456
nnnnnnn
nnnnnn
fffffff
h
yyyyyyy n
++−+−++
−+−+−=
++++++
++++++
(14)
P=7, Cp+2 ≈ -4.1667x10-3
2.2 Analysis of the basic properties of methods (10),...,(14).
To justify the accuracy and applicability of our proposed methods, we need to examine their basic
properties which include order of accuracy, error constant, symmetry, consistency and zero stability.
Order of accuracy and error constant:
Definition1. Linear multistep methods (10)-(14) are said to be of order p, if p is the largest positive integer
for which C0 =C1 = ... =Cp =Cp+1 =0 but Cp+2 ≠0. Hence, our methods are of orders p =4(5)8 with principal
truncation error Cp+2 ≈ -4.1667x10-3
.
Symmetry: According to Lambert (1976), a class of linear multistep methods (10)-(14) is symmetric if
jkj −= αα
jkj −= ββ , j=0(1) k/2, for even k
(15)
jkj −−= αα
jkj −−= ββ , j=0(1) k, for odd k
(16)
Consistency
Deinition2: A linear multistep method is consistent if;
a). It has order p≥1
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b). ∑=
=
k
j
j
0
0α
c). 0)()( =′= rr ρρ
d).
)(!2)( rr δρ =′′
where )(rρ and )(rδ are the first and second characteristic polynomials of our methods. Obviously,
conditions above are satisfied using the information as contained in Table1 for k=2(3)6.
Zero stability
Definition3: A linear multistep method is said to be zero-stable if no root ρ(r) has modulus greater than
one (that is, if all roots of ρ(r) lie in or on the unit circle). A numerical solution to class of system (3) is
stable if the difference between the numerical and theoretical solutions can be made as small as possible.
Hence, methods (10)-(14) are found to be zero-stable since none of their roots has modulus greater than
one.
Convergence
Definition 4: The method defined by (5) is said to be convergent if, for all initial value problems satisfying
the hypotheses of the theorem 1, the fixed station limit
hnat
tyyh n
max
lim
)(0 max
+=
=→
(17)
holds for all tЄ [a, b] and for all solutions of the equation (5) satisfying starting conditions
10),( −<<= kjhy jj φ ,limh→0 )(hjφ =y0
(18).
Theorem 2 The necessary and sufficient conditions for the method (5) or ((10)-(14)) to be convergent
is that be both consistent and zero-stable.
3. Numerical Experiments: The discrete methods described above are implicit in nature, meaning that
they require some starting values before they can be implemented. Starting values for yn+j, y’n+j, 2≤j≤6 are
predicted using Taylor series up to the order of each scheme. For a numerical solution we introduce a
partition of [a, b]: t0=a, tn=t0+nh, (n=1, 2, ..., nmax)such that tnmax =b which means that nmax and h are
linked, h=(b-a)/nmax.
Accuracy of our methods are demonstrated with five sample initial value problems ranging from general
and special, linear and nonlinear and inhomogeneous second order differential equations.
Example 1:
003125.0,5.0)0(,1)0(,0)( 2
==′==′−′′ hyyyy
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Analytical solution: 





−
+
+=
t
t
ty
2
2
ln
2
1
1)(
Example 2:
025.0,1)0(,0)0(,0 ==′==+′′ hyyyy
Analytical solution: y(t)=sin(t)
Example 3:
003125.0,1)1(,1)1(,0
46
2
==′==+′+′′ hyyy
t
y
t
y
The analytical solution is: 4
3
2
3
5
)(
tt
ty −=
Example 4:
11)0(,1)0(,0)sin(99100 =′==+−′′ yytyy
Whose analytical solution is:
)sin()10sin()10cos()( tttty ++=
Example 5:
0)0(,1)0(),cos(001.0 =′==+′′ yytyy
With analytical solution:
).sin(0005.0)cos()( tttty +=
4. Results and Discussion
Tables 1-5 present the numerical solutions in terms of the global maximum errors obtained for each of the
problems considered respectively. The errors of the new methods (10)-(14) denoted as methods [A]-[E] are
compared with those of block method of Badmus and Yahaya (2009) represented as [BMY],
exponentially-fitted RK method of Simos (1998) taken to be [SIM]and exponentially fitted RK methods of
Vanden Berghe et al. (1999) denoted as [VAN].
Discussion
In tables 1 and 2, we compare the maximum errors obtained for the proposed schemes in equations (10)-(14)
denoted as methods [A]-[E] respectively for the problems considered, results are given at some selected
steps. In columns 3-7 we give the absolute errors.
In Tables 3 and 5, we compare the block method of Badmus and Yahaya ([BMY]) and the
exponentially-fitted Runge-Kutta methods of Vanden Berghe et al. ([VAN]) with the new method [C] for
problems 3 and 5 respectively. The results in both cases show that our new method is much more efficient
on comparison.
Finally, we also compare the exponentially-fitted method of Simos ([SIM]) with our new method [D] for
problem 4, the end-point global error is presented in columns 4-5 of Table 4.
5. Conclusion
Mathematical Theory and Modeling www.iiste.org
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Vol.2, No.4, 2012
73
In this paper, a new approach for constructing a family of linear multistep methods with higher
algebraic orders is developed. Using this new approach, we can construct any k-step method which directly
integrates functions of the form (3) without reformulation to first order systems. Based on the new approach,
the methods are symmetric, consistent, zero-stable and convergence.
All computations were carried out with a MATLAB programming language. It is evident from the results
presented in Tables 1-5 that the new methods are considerably much more accurate than the other numerical
methods that we have considered.
References
Abhulimen, C.E. & Otunta, F. O. (2006). “A Sixth-order Multiderivative Multisteps Methods for Systems
of differential Equations”, International Journal of numerical Mathematics, 1, 248-268.
Ademiluyi, R. A. & Kayode S. J. (2001). “Maximum Order Second-derivative hybrid multistep methods for
Integration of Initial Value problems in Ordinary Differential Equations”, Journal of Nigerian Association
of Mathematical Physics, 5, 251-262.
Aruchunan, E. & Sulaiman, J. (2010). “Numerical Solution of Second-order Linear Fredholm
Integro-differential Equation using Generalized Minimal Residual method”, American Journal of Applied
Science, 7, 780-783.
Awoyemi, D. O. (2001). “A New Sith-order Algorithm for General Second-order Differential Equations”,
International Journal of Computational Mathematics, 77, 117-124.
Awoyemi, D. O. (2005). “Algorithmic Collocation Approach for Direct Solution of Fourth-order Initial
Value problems of ODEs”, International Journal of Computational Mathematics, 82 271-284.
Awoyemi, D. O. & Kayode, S. J. (2005). “An Implicit Collocation Method for Direct Solution of
Second-order ODEs”, Journal of Nigerian Association of Mathematical Physics, 24, 70-78.
Badmus, A. M. & Yahaya, Y. A. (2009). “An Accurate Uniform Order 6 Blocks Method for Direct Solution
of General Second-order ODEs”, Pacific Journal of Science , 10, 248-254.
Bun, R. A. Vasil’Yer, Y. D. (1992). “ANumerical method for Solving Differential Equations of any Orders”,
Computational Maths Physics, 32, 317-330.
Chan, R. P. K. & Leon, P. (2004). “Order Conditions and Symmetry for Two-step Hybrid Methods”,
International Journal of Computational Mathematics , 81, 1519-1536.
Kayode, S. J. (2010). “A zero-stable Optimal method for Direct Solution of Second-order differential
Equation ”, Journal of mathematics & Statistics, 6, 367-371.
Lambert, J. D. & Watson, A. (1976). “Symmetric Multistep method for periodic Initial Value Problems”,
Journal of Inst. Mathematics & Applied, 18, 189-202
Lambert, J. D. (1991). “Numerical Methods for Ordinary Differential Systems of Initial Value Problems”,
John Willey & Sons, New York.
Owolabi, K. M. (2011). “An Order Eight Zero-stable Method for direct Integration of Second-order
Ordinary Differential Equations ”, Mathematics Applied in Science & Technology, 3(1), 23-33.
Owolabi, K. M. (2011). “4th
-step Implicit formula for Solution of Initial-value problems of Second-order
ordinary Differential equations ”, Academic Journal of Mathematics & Computer Science Research, 4,
270-272.
Simos, T. E. (1998). “An Exponentially-fitted Runge-Kutta Method for the Numerical Integration of
Initial-value Problems with periodic or Oscillating Solutions”, Computational Physics Communications,
115, 1-8.
Vanden Berghe, G., De Meyer, H., Van Daele, M., Van Hecke, T. 1999. Exponentially-fitted explicit
Mathematical Theory and Modeling www.iiste.org
ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online)
Vol.2, No.4, 2012
74
Runge-Kutta methods, Computer Phys Commun. 123:7-15.
Table 0.
K
0α 1α 2α 3α 4α 5α kα 0β 1β 2β 3β 4β 5β 6β
p Cp+2
2 1 -2 1
12
1
12
10
12
1 4
-
240
1
3 -1 3 -3 -
-
12
1
-
12
9
12
9
12
1 5 -
4 1 -4 6 -4 -
12
1
12
8
-
12
18
12
8
12
1 6 -
5 -1 5 -10 10 -5 -
-
12
1
-
12
7
12
26
-
12
26
12
7
12
1 7 -
6 1 -6 15 -20 15 -6 -
12
1
12
6
-
12
33
12
52
-
12
33
12
6
12
1 8 -
Table 1: Comparison of errors arising from the new methods for example 1
t Exact [A] [B] [C] [D] [E]
0.100
0.125
0.150
0.175
0.200
1.050041676
1.100335360
1.151140451
1.202732563
1.255412817
3.9101E-06
7.8321E-06
1.3721E-05
2.1982E-05
3.3021E-05
1.5497E-08
5.8113E-08
1.3682E-07
1.3721E-07
2.2006E-06
2.3801E-09
4.3400E-09
1.9070E-08
3.6951E-07
6.0871E-07
7.3310E-10
3.5810E-09
8.6691E-09
4.6490E-08
7.5481E-08
2.6314E-12
1.1900E-11
1.9211E-11
2.0601E-10
5.5816E-09
Table 2: Comparison of errors arising from the new methods for example 2
t Exact [A] [B] [C] [D] [E]
0.100
0.150
0.200
0.250
0.300
0.074929707
0.149438143
0.198669344
0.247403994
0.295520246
1.5616E-06
5.4621E-06
1.3098E-05
2.5699E-05
4.4484E-05
6.2414E-07
3.1184E-06
8.7225E-06
1.8667E-05
3.4171E-05
8.2001E-10
6.4122E-09
2.6520E-08
8.0170E-08
1.9819e-07
8.9611E-10
7.6048E-09
2.2781E-08
9.9998E-08
2.4736E-07
8.8862E-12
5.3631E-12
1.2370E-10
9.6901E-10
3.5761E-08
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Table 3: Comparison of errors of the new scheme [C] with method [BMY] for example 3
t Exact [C] Computed [C] [BMY]
0.025000
0.015625
0.012500
0.006250
0.003125
1.022049164
1.014447543
1.011741018
1.006057503
1.003076526
1.022049012
1.014447461
1.011741018
1.006057499
1.003076525
1.52E-07
8.18E-08
3.63E-08
4.09E-09
1.40E-09
2.21E-04
1.56E-04
1.35E-04
7.50E-04
3.84E-05
Table 4: Comparison of errors of scheme [D]with method [SIM] for example 4
t Exact [D] Computed [D] [SIM]
1.00000
0.50000
0.02500
0.12500
0.06250
0.03125
-0.541621655
-0.195836551
0.044732488
1.388981715
1.458519710
1.290251377
-0.424800002
-0.175498054
0.044721485
1.388981253
1.458551881
1.290251373
1.1E-01
2.3E-02
1.1E-05
4.6E-07
8.9E-08
3.4E-09
1.4E-01
3.5E-02
1.1E-03
8.4E-05
5.5E-06
3.5E-07
Table 5: Comparison of the end point errors of scheme [C] with method [VAN] for example 5
T Exact [C] Computed [C] [VAN]
1.00000
0.50000
0.02500
0.12500
0.06250
0.540723041
0.877702418
0.968943347
0.992205459
0.998049463
0.539941907
0.877693052
0.968942743
0.992205416
0.998049460
7.81E-04
9.37E-06
6.05E-07
4.32E-08
2.88E-09
1.20E-03
7.54E-05
4.74E-06
2.96E-07
1.86E-08
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11.a family of implicit higher order methods for the numerical integration of second order differential equations

  • 1. Mathematical Theory and Modeling www.iiste.org ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online) Vol.2, No.4, 2012 67 A Family of Implicit Higher Order Methods for the Numerical Integration of Second Order Differential Equations Owolabi Kolade Matthew Department of Mathematics, University of Western Cape, 7535, Bellville, South Africa *E-mail of the corresponding author: kowolabi@uwc.ac.za; kmowolabi2@gmail.com Abstract A family of higher order implicit methods with k steps is constructed, which exactly integrate the initial value problems of second order ordinary differential equations directly without reformulation to first order systems. Implicit methods with step numbers }6,...,3,2{∈k are considered. For these methods, a study of local truncation error is made with their basic properties. Error and step length control based on Richardson extrapolation technique is carried out. Illustrative examples are solved with the aid of MATLAB package. Findings from the analysis of the basic properties of the methods show that they are consistent, symmetric and zero-stable. The results obtained from numerical examples show that these methods are much more efficient and accurate on comparison. These methods are preferable to some existing methods owing to the fact that they are efficient and simple in terms of derivation and computation Keywords: Error constant, implicit methods, Order of accuracy, Zero-Stability, Symmetry 1. Introduction In the last decade, there has been much research activity in the area of numerical solution of higher order linear and nonlinear initial value problems of ordinary differential equations of the form 10 )1()( )(,0)...,,,,( − − == m mm tyyyytf η n ytm ℜ∈= },{,...,2,1 (1) which are of great interest to Scientists and Engineers. The result of this activity are methods which can be applied to many problems in celestial and quantum mechanics, nuclear and theoretical physics, astrophysics, quantum chemistry, molecular dynamics and transverse motion to mention a few. In literature, most models encountered are often reduced to first order systems of the form ],[,)(),,( 00 batytyytfy ∈==′ (2) before numerical solution is sought [see for instance, Abhulimen and Otunta (2006), Ademiluyi and Kayode (2001), Awoyemi (2005), Chan et al. (2004)]. In this study, our interest is to develop a class of k-steps linear multistep methods for integration of general second order problems without reformulation to systems of first order. We shall be concerned primarily with differential equations of the type
  • 2. Mathematical Theory and Modeling www.iiste.org ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online) Vol.2, No.4, 2012 68 1,0,),,(],,[,)(),,,( 0 )( =ℜ∈′∈=′=′′ myytfbattyyytfy n m m η (3) Theorem 1 If f(t,y), f:Ʀ x Ʀ → Ʀ is defined and continuous on all tЄ[a, b] and ∞<<∞− y and a constant L exist such that **),(),( yyLytfytf −<− (4) for every pair (t, y) and (t, y*) in the quoted region then, for any y0ЄƦ the stated initial value problem admits a unique solution which is continuous and differentiable on [a, b]. Efforts are made to develop a class of implicit schemes of higher step-numbers with reduced functions evaluation for direct integration of problem (3) for k=2,3,... ,6. The remainder of the paper is organized in the following way. Under materials and methods, construction of the schemes for approximating the solutions of (3) is presented with the analysis of their basic properties for proper implementation. Some sample problems coded in MATLAB are equally considered. Finally, some concluding comments are made to justify the obtainable results and suitability of the proposed schemes on comparisons. 2. Materials and methods 2.1 Construction of the schemes: The proposed numerical method of consideration for direct integration of general second order differential equations of type (3) is of the form )...(... 110 2 11110 knknnknknnkn fffhyyyy ++−+−++ +++++++= βββααα , (5) taken from the classical K-step method with the algorithm ∑ ∑= = ++ == k j k j jnjjnj nfhy 0 0 2 ...,1,0,βα (6) where yn+j is an approximation to y(xn+j) and fn+j =f(xn+j, yn+j, y’n+j). The coefficients αj and βj are constants which do not depend on n subject to the conditions 0,1 00 ≠+= βααk are determined to ensure that the methods are symmetric, consistent and zero stable. Also, method (4) is implicit since βk≠0. The values of these coefficients are determined from the local truncation error (lte) )]...(...[ 110 2 11110 knknnknknnknkn fffhyyyyT ++−+−+++ +++++++−= βββααα (7)
  • 3. Mathematical Theory and Modeling www.iiste.org ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online) Vol.2, No.4, 2012 69 generated by one-step application of (5) for numerical solution of (3). Clearly, accuracy of these schemes depend on the real constants αj and βj . In attempt to obtain the numerical values of these constants, the following steps were adopted; Taylor series expansion of kny + , 121 .,..,, −+++ knnn yyy and knnn fff +++ .,..,, 21 about the point ),( nn yt yields )(0 ! )( ... !2 )( )( )1()()2( 2 )1( + + +++++= pp n p nnnkn hy p kh y kh ykhyT } )!1( )( 0 ! )( ... !2 )( )({ )1( 1 )()2( 2 )1( 1 0 + +− = + +++++− ∑ p n p p n p nnn k j j y p jh y p jh y jh yjhyα       − + − ++++− + −− = ∑ )1( 1 )( 2 )4( 2 )3()2( 0 2 )!1( )( 0 )!2( )( ... !2 )( )( p n p p n p nnn k j j y p jh y p jh y jh yjhyh β (8) Terms in equal powers of h are collected to have +        −−+        −+        −= ∑ ∑∑∑ − = = − = − = + )2(2 1 0 0 22 )1( 1 0 1 0 !2 )( !2 1 n k j k j jjn k j jn k j jkn yh jk hyjkyT βααα ++        −− ∑∑ = − = ... !3 )( !3 )3(3 0 1 0 33 n k j j k j j yhj jk βα ( )1)( 0 21 0 0 )2(! )( ! + = −− = +        − −− ∑∑ pp n p k j j pk j j pp hyh p j p j p k βα (9) Accuracy of order p is imposed on Tn+k to obtain Ci=0, 0 ≤ i ≤ p. Setting k=2(3)6, j=0(1)6 in equation (9), the obtainable algebraic system of equations are solved with MATLAB in the form AX=B for various step-numbers to obtain coefficients of the methods parameters displayed in Table 0. Using the information in Table 0 for k=2(3)6 in (5), we have the following implicit schemes )10( 12 2 12 2 12 nnnnn fff h yyy n +++−= ++++ (10) P=4, Cp+2 ≈ -4.1667x10-3 which coincides with Numerov’s method of Lambert (see for more details in [7]) )99( 12 33 123 2 123 nnnnnnn ffff h yyyy n −−+++−= ++++++
  • 4. Mathematical Theory and Modeling www.iiste.org ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online) Vol.2, No.4, 2012 70 (11) P=5, Cp+2 ≈ -4.1667x10-3 )8188( 12 464 1234 2 1234 nnnnnnnnn fffff h yyyyy n −+−++−+−= ++++++++ (12) P=6, Cp+2 ≈ -4.1667x10-3 )726267( 12 510105 12345 2 12345 nnnnnn nnnnn ffffff h yyyyyy n −−+−++ +−+−= +++++ +++++ (13) P=7, Cp+2 ≈ -4.1667x10-3 )63352336( 12 61520156 123456 2 123456 nnnnnnn nnnnnn fffffff h yyyyyyy n ++−+−++ −+−+−= ++++++ ++++++ (14) P=7, Cp+2 ≈ -4.1667x10-3 2.2 Analysis of the basic properties of methods (10),...,(14). To justify the accuracy and applicability of our proposed methods, we need to examine their basic properties which include order of accuracy, error constant, symmetry, consistency and zero stability. Order of accuracy and error constant: Definition1. Linear multistep methods (10)-(14) are said to be of order p, if p is the largest positive integer for which C0 =C1 = ... =Cp =Cp+1 =0 but Cp+2 ≠0. Hence, our methods are of orders p =4(5)8 with principal truncation error Cp+2 ≈ -4.1667x10-3 . Symmetry: According to Lambert (1976), a class of linear multistep methods (10)-(14) is symmetric if jkj −= αα jkj −= ββ , j=0(1) k/2, for even k (15) jkj −−= αα jkj −−= ββ , j=0(1) k, for odd k (16) Consistency Deinition2: A linear multistep method is consistent if; a). It has order p≥1
  • 5. Mathematical Theory and Modeling www.iiste.org ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online) Vol.2, No.4, 2012 71 b). ∑= = k j j 0 0α c). 0)()( =′= rr ρρ d). )(!2)( rr δρ =′′ where )(rρ and )(rδ are the first and second characteristic polynomials of our methods. Obviously, conditions above are satisfied using the information as contained in Table1 for k=2(3)6. Zero stability Definition3: A linear multistep method is said to be zero-stable if no root ρ(r) has modulus greater than one (that is, if all roots of ρ(r) lie in or on the unit circle). A numerical solution to class of system (3) is stable if the difference between the numerical and theoretical solutions can be made as small as possible. Hence, methods (10)-(14) are found to be zero-stable since none of their roots has modulus greater than one. Convergence Definition 4: The method defined by (5) is said to be convergent if, for all initial value problems satisfying the hypotheses of the theorem 1, the fixed station limit hnat tyyh n max lim )(0 max += =→ (17) holds for all tЄ [a, b] and for all solutions of the equation (5) satisfying starting conditions 10),( −<<= kjhy jj φ ,limh→0 )(hjφ =y0 (18). Theorem 2 The necessary and sufficient conditions for the method (5) or ((10)-(14)) to be convergent is that be both consistent and zero-stable. 3. Numerical Experiments: The discrete methods described above are implicit in nature, meaning that they require some starting values before they can be implemented. Starting values for yn+j, y’n+j, 2≤j≤6 are predicted using Taylor series up to the order of each scheme. For a numerical solution we introduce a partition of [a, b]: t0=a, tn=t0+nh, (n=1, 2, ..., nmax)such that tnmax =b which means that nmax and h are linked, h=(b-a)/nmax. Accuracy of our methods are demonstrated with five sample initial value problems ranging from general and special, linear and nonlinear and inhomogeneous second order differential equations. Example 1: 003125.0,5.0)0(,1)0(,0)( 2 ==′==′−′′ hyyyy
  • 6. Mathematical Theory and Modeling www.iiste.org ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online) Vol.2, No.4, 2012 72 Analytical solution:       − + += t t ty 2 2 ln 2 1 1)( Example 2: 025.0,1)0(,0)0(,0 ==′==+′′ hyyyy Analytical solution: y(t)=sin(t) Example 3: 003125.0,1)1(,1)1(,0 46 2 ==′==+′+′′ hyyy t y t y The analytical solution is: 4 3 2 3 5 )( tt ty −= Example 4: 11)0(,1)0(,0)sin(99100 =′==+−′′ yytyy Whose analytical solution is: )sin()10sin()10cos()( tttty ++= Example 5: 0)0(,1)0(),cos(001.0 =′==+′′ yytyy With analytical solution: ).sin(0005.0)cos()( tttty += 4. Results and Discussion Tables 1-5 present the numerical solutions in terms of the global maximum errors obtained for each of the problems considered respectively. The errors of the new methods (10)-(14) denoted as methods [A]-[E] are compared with those of block method of Badmus and Yahaya (2009) represented as [BMY], exponentially-fitted RK method of Simos (1998) taken to be [SIM]and exponentially fitted RK methods of Vanden Berghe et al. (1999) denoted as [VAN]. Discussion In tables 1 and 2, we compare the maximum errors obtained for the proposed schemes in equations (10)-(14) denoted as methods [A]-[E] respectively for the problems considered, results are given at some selected steps. In columns 3-7 we give the absolute errors. In Tables 3 and 5, we compare the block method of Badmus and Yahaya ([BMY]) and the exponentially-fitted Runge-Kutta methods of Vanden Berghe et al. ([VAN]) with the new method [C] for problems 3 and 5 respectively. The results in both cases show that our new method is much more efficient on comparison. Finally, we also compare the exponentially-fitted method of Simos ([SIM]) with our new method [D] for problem 4, the end-point global error is presented in columns 4-5 of Table 4. 5. Conclusion
  • 7. Mathematical Theory and Modeling www.iiste.org ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online) Vol.2, No.4, 2012 73 In this paper, a new approach for constructing a family of linear multistep methods with higher algebraic orders is developed. Using this new approach, we can construct any k-step method which directly integrates functions of the form (3) without reformulation to first order systems. Based on the new approach, the methods are symmetric, consistent, zero-stable and convergence. All computations were carried out with a MATLAB programming language. It is evident from the results presented in Tables 1-5 that the new methods are considerably much more accurate than the other numerical methods that we have considered. References Abhulimen, C.E. & Otunta, F. O. (2006). “A Sixth-order Multiderivative Multisteps Methods for Systems of differential Equations”, International Journal of numerical Mathematics, 1, 248-268. Ademiluyi, R. A. & Kayode S. J. (2001). “Maximum Order Second-derivative hybrid multistep methods for Integration of Initial Value problems in Ordinary Differential Equations”, Journal of Nigerian Association of Mathematical Physics, 5, 251-262. Aruchunan, E. & Sulaiman, J. (2010). “Numerical Solution of Second-order Linear Fredholm Integro-differential Equation using Generalized Minimal Residual method”, American Journal of Applied Science, 7, 780-783. Awoyemi, D. O. (2001). “A New Sith-order Algorithm for General Second-order Differential Equations”, International Journal of Computational Mathematics, 77, 117-124. Awoyemi, D. O. (2005). “Algorithmic Collocation Approach for Direct Solution of Fourth-order Initial Value problems of ODEs”, International Journal of Computational Mathematics, 82 271-284. Awoyemi, D. O. & Kayode, S. J. (2005). “An Implicit Collocation Method for Direct Solution of Second-order ODEs”, Journal of Nigerian Association of Mathematical Physics, 24, 70-78. Badmus, A. M. & Yahaya, Y. A. (2009). “An Accurate Uniform Order 6 Blocks Method for Direct Solution of General Second-order ODEs”, Pacific Journal of Science , 10, 248-254. Bun, R. A. Vasil’Yer, Y. D. (1992). “ANumerical method for Solving Differential Equations of any Orders”, Computational Maths Physics, 32, 317-330. Chan, R. P. K. & Leon, P. (2004). “Order Conditions and Symmetry for Two-step Hybrid Methods”, International Journal of Computational Mathematics , 81, 1519-1536. Kayode, S. J. (2010). “A zero-stable Optimal method for Direct Solution of Second-order differential Equation ”, Journal of mathematics & Statistics, 6, 367-371. Lambert, J. D. & Watson, A. (1976). “Symmetric Multistep method for periodic Initial Value Problems”, Journal of Inst. Mathematics & Applied, 18, 189-202 Lambert, J. D. (1991). “Numerical Methods for Ordinary Differential Systems of Initial Value Problems”, John Willey & Sons, New York. Owolabi, K. M. (2011). “An Order Eight Zero-stable Method for direct Integration of Second-order Ordinary Differential Equations ”, Mathematics Applied in Science & Technology, 3(1), 23-33. Owolabi, K. M. (2011). “4th -step Implicit formula for Solution of Initial-value problems of Second-order ordinary Differential equations ”, Academic Journal of Mathematics & Computer Science Research, 4, 270-272. Simos, T. E. (1998). “An Exponentially-fitted Runge-Kutta Method for the Numerical Integration of Initial-value Problems with periodic or Oscillating Solutions”, Computational Physics Communications, 115, 1-8. Vanden Berghe, G., De Meyer, H., Van Daele, M., Van Hecke, T. 1999. Exponentially-fitted explicit
  • 8. Mathematical Theory and Modeling www.iiste.org ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online) Vol.2, No.4, 2012 74 Runge-Kutta methods, Computer Phys Commun. 123:7-15. Table 0. K 0α 1α 2α 3α 4α 5α kα 0β 1β 2β 3β 4β 5β 6β p Cp+2 2 1 -2 1 12 1 12 10 12 1 4 - 240 1 3 -1 3 -3 - - 12 1 - 12 9 12 9 12 1 5 - 4 1 -4 6 -4 - 12 1 12 8 - 12 18 12 8 12 1 6 - 5 -1 5 -10 10 -5 - - 12 1 - 12 7 12 26 - 12 26 12 7 12 1 7 - 6 1 -6 15 -20 15 -6 - 12 1 12 6 - 12 33 12 52 - 12 33 12 6 12 1 8 - Table 1: Comparison of errors arising from the new methods for example 1 t Exact [A] [B] [C] [D] [E] 0.100 0.125 0.150 0.175 0.200 1.050041676 1.100335360 1.151140451 1.202732563 1.255412817 3.9101E-06 7.8321E-06 1.3721E-05 2.1982E-05 3.3021E-05 1.5497E-08 5.8113E-08 1.3682E-07 1.3721E-07 2.2006E-06 2.3801E-09 4.3400E-09 1.9070E-08 3.6951E-07 6.0871E-07 7.3310E-10 3.5810E-09 8.6691E-09 4.6490E-08 7.5481E-08 2.6314E-12 1.1900E-11 1.9211E-11 2.0601E-10 5.5816E-09 Table 2: Comparison of errors arising from the new methods for example 2 t Exact [A] [B] [C] [D] [E] 0.100 0.150 0.200 0.250 0.300 0.074929707 0.149438143 0.198669344 0.247403994 0.295520246 1.5616E-06 5.4621E-06 1.3098E-05 2.5699E-05 4.4484E-05 6.2414E-07 3.1184E-06 8.7225E-06 1.8667E-05 3.4171E-05 8.2001E-10 6.4122E-09 2.6520E-08 8.0170E-08 1.9819e-07 8.9611E-10 7.6048E-09 2.2781E-08 9.9998E-08 2.4736E-07 8.8862E-12 5.3631E-12 1.2370E-10 9.6901E-10 3.5761E-08
  • 9. Mathematical Theory and Modeling www.iiste.org ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online) Vol.2, No.4, 2012 75 Table 3: Comparison of errors of the new scheme [C] with method [BMY] for example 3 t Exact [C] Computed [C] [BMY] 0.025000 0.015625 0.012500 0.006250 0.003125 1.022049164 1.014447543 1.011741018 1.006057503 1.003076526 1.022049012 1.014447461 1.011741018 1.006057499 1.003076525 1.52E-07 8.18E-08 3.63E-08 4.09E-09 1.40E-09 2.21E-04 1.56E-04 1.35E-04 7.50E-04 3.84E-05 Table 4: Comparison of errors of scheme [D]with method [SIM] for example 4 t Exact [D] Computed [D] [SIM] 1.00000 0.50000 0.02500 0.12500 0.06250 0.03125 -0.541621655 -0.195836551 0.044732488 1.388981715 1.458519710 1.290251377 -0.424800002 -0.175498054 0.044721485 1.388981253 1.458551881 1.290251373 1.1E-01 2.3E-02 1.1E-05 4.6E-07 8.9E-08 3.4E-09 1.4E-01 3.5E-02 1.1E-03 8.4E-05 5.5E-06 3.5E-07 Table 5: Comparison of the end point errors of scheme [C] with method [VAN] for example 5 T Exact [C] Computed [C] [VAN] 1.00000 0.50000 0.02500 0.12500 0.06250 0.540723041 0.877702418 0.968943347 0.992205459 0.998049463 0.539941907 0.877693052 0.968942743 0.992205416 0.998049460 7.81E-04 9.37E-06 6.05E-07 4.32E-08 2.88E-09 1.20E-03 7.54E-05 4.74E-06 2.96E-07 1.86E-08
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