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BabBab 33
DeretDeret TaylorTaylor
OlehOleh ::
Devie RosaDevie Rosa AnamisaAnamisa
PengertianPengertian
DeretDeret TaylorTaylor merupakanmerupakan dasardasar untukuntuk menyelesaikanmenyelesaikan
masalahmasalah terutamaterutama persamaanpersamaan differensialdifferensial..
PersamaanPersamaan DeretDeret Taylor :Taylor :
KetKet::
f(xif(xi) =) = fungsifungsi dititikdititik II
f(xi+1) =f(xi+1) = fungsifungsi dititikdititik xi+1xi+1
f’,f”,ff’,f”,f’’’ =’’’ = turunanturunan pertama,keduapertama,kedua........keke--nn daridari fungsifungsi
== jarakjarak antaraantara xixi dandan xi+1xi+1
RnRn == kesalahankesalahan pemotonganpemotongan = Ea == Ea =
! = operator! = operator faktorialfaktorial
TahapTahap PenyelesaianPenyelesaian
MemperhitungkanMemperhitungkan sukusuku pertamapertama (order(order nolnol))
f(xi+1) =f(xi+1) = f(xif(xi))
MemperhitungkanMemperhitungkan duadua sukusuku pertamapertama (order 1)(order 1)
f(xi+1) =f(xi+1) = f(xif(xi) +) + f’(xif’(xi) /1!) /1!
MemperhitungkanMemperhitungkan tigatiga sukusuku pertamapertama (order 2)(order 2)
f(xi+1) =f(xi+1) = f(xf(x) +) + f’(xif’(xi) +) + f”(xif”(xi) /2) /2
IterasiIterasi akanakan berhentiberhenti jikajika RnRn = 0= 0
ContohContoh
1.1. DiketahuiDiketahui seuatuseuatu fungsifungsi ::
dengandengan menggunakanmenggunakan DeretDeret TaylorTaylor padapada orderorder berapaberapa,,
hasilhasil penyelesaianpenyelesaian numeriknumerik samasama dengandengan penyelesaianpenyelesaian
eksakeksak??
dimanadimana order 0,1,2order 0,1,2 dandan 33 perkiraanperkiraan fungsifungsi tersebuttersebut padapada
titiktitik xi+1 = 1xi+1 = 1 dandan padapada titiktitik xi+1 =1xi+1 =1 beradaberada padapada jarakjarak
=1=1 daridari titiktitik x = 0.x = 0.
JawabJawab ::
f(0) = 0.5f(0) = 0.5
f(1) = 1.5f(1) = 1.5
UntukUntuk order 0 :order 0 :
f(xi+1) =f(xi+1) = f(xif(xi))
f(0 +1) = f(0)f(0 +1) = f(0)
f(1) = 0.5f(1) = 0.5
KesalahanKesalahan pemotonganpemotongan ::
RnRn = 1.5= 1.5 –– 0.5 = 10.5 = 1
UntukUntuk order 1 :order 1 :
..
f(0+1) = 0.5 +( ) 1f(0+1) = 0.5 +( ) 1
= 0.5 (0.75 (0) + 0 +0.25= 0.5 (0.75 (0) + 0 +0.25
= 0.75= 0.75
f(xi+1) =f(xi+1) = f(xif(xi) +) + f’(xif’(xi) /1!) /1!
KesalahanKesalahan pemotonganpemotongan
RnRn = 1.5= 1.5 –– 0.75 =0.75 = 0.750.75
UntukUntuk Order 2 :Order 2 :
f(xi+1) = 0.5 + 0.25 * 1 + 1 * (1/2)(1/2)f(xi+1) = 0.5 + 0.25 * 1 + 1 * (1/2)(1/2)
= 1.25= 1.25
KesalahanKesalahan pemotonganpemotongan
RnRn = 1.5= 1.5 –– 1.25 = 0.251.25 = 0.25
UntukUntuk Order 3 :Order 3 :
f(xi+1) = 0.5 + 0.25 + 0.5 + 0.25f(xi+1) = 0.5 + 0.25 + 0.5 + 0.25
= 1.5= 1.5
KesalahanKesalahan pemotonganpemotongan ::
RnRn = 1.5= 1.5 –– 1.51.5 = 0 (= 0 (terbuktiterbukti))
SoalSoal
1.1. DiketahuiDiketahui suatusuatu fungsifungsi ::
dengandengan menggunakanmenggunakan DeretDeret TaylorTaylor padapada orderorder
berapaberapa,, hasilhasil penyelesaianpenyelesaian numeriknumerik samasama
dengandengan penyelesaianpenyelesaian eksakeksak,, perkiraanperkiraan fungsifungsi
tersebuttersebut padapada titiktitik xi+1 = 0.5xi+1 = 0.5 berdasarkanberdasarkan nilainilai
fungsifungsi padapada titiktitik xi=0?xi=0?
2.2. DiketahuiDiketahui suatusuatu fungsifungsi ::
hitunghitung pulapula padapada titiktitik xi+1 = 0.25xi+1 = 0.25 dandan xi=0.xi=0.
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3 deret-taylor

  • 1. BabBab 33 DeretDeret TaylorTaylor OlehOleh :: Devie RosaDevie Rosa AnamisaAnamisa
  • 2. PengertianPengertian DeretDeret TaylorTaylor merupakanmerupakan dasardasar untukuntuk menyelesaikanmenyelesaikan masalahmasalah terutamaterutama persamaanpersamaan differensialdifferensial.. PersamaanPersamaan DeretDeret Taylor :Taylor : KetKet:: f(xif(xi) =) = fungsifungsi dititikdititik II f(xi+1) =f(xi+1) = fungsifungsi dititikdititik xi+1xi+1 f’,f”,ff’,f”,f’’’ =’’’ = turunanturunan pertama,keduapertama,kedua........keke--nn daridari fungsifungsi == jarakjarak antaraantara xixi dandan xi+1xi+1 RnRn == kesalahankesalahan pemotonganpemotongan = Ea == Ea = ! = operator! = operator faktorialfaktorial
  • 3. TahapTahap PenyelesaianPenyelesaian MemperhitungkanMemperhitungkan sukusuku pertamapertama (order(order nolnol)) f(xi+1) =f(xi+1) = f(xif(xi)) MemperhitungkanMemperhitungkan duadua sukusuku pertamapertama (order 1)(order 1) f(xi+1) =f(xi+1) = f(xif(xi) +) + f’(xif’(xi) /1!) /1! MemperhitungkanMemperhitungkan tigatiga sukusuku pertamapertama (order 2)(order 2) f(xi+1) =f(xi+1) = f(xf(x) +) + f’(xif’(xi) +) + f”(xif”(xi) /2) /2 IterasiIterasi akanakan berhentiberhenti jikajika RnRn = 0= 0
  • 4. ContohContoh 1.1. DiketahuiDiketahui seuatuseuatu fungsifungsi :: dengandengan menggunakanmenggunakan DeretDeret TaylorTaylor padapada orderorder berapaberapa,, hasilhasil penyelesaianpenyelesaian numeriknumerik samasama dengandengan penyelesaianpenyelesaian eksakeksak?? dimanadimana order 0,1,2order 0,1,2 dandan 33 perkiraanperkiraan fungsifungsi tersebuttersebut padapada titiktitik xi+1 = 1xi+1 = 1 dandan padapada titiktitik xi+1 =1xi+1 =1 beradaberada padapada jarakjarak =1=1 daridari titiktitik x = 0.x = 0. JawabJawab :: f(0) = 0.5f(0) = 0.5 f(1) = 1.5f(1) = 1.5
  • 5. UntukUntuk order 0 :order 0 : f(xi+1) =f(xi+1) = f(xif(xi)) f(0 +1) = f(0)f(0 +1) = f(0) f(1) = 0.5f(1) = 0.5 KesalahanKesalahan pemotonganpemotongan :: RnRn = 1.5= 1.5 –– 0.5 = 10.5 = 1 UntukUntuk order 1 :order 1 : .. f(0+1) = 0.5 +( ) 1f(0+1) = 0.5 +( ) 1 = 0.5 (0.75 (0) + 0 +0.25= 0.5 (0.75 (0) + 0 +0.25 = 0.75= 0.75 f(xi+1) =f(xi+1) = f(xif(xi) +) + f’(xif’(xi) /1!) /1!
  • 6. KesalahanKesalahan pemotonganpemotongan RnRn = 1.5= 1.5 –– 0.75 =0.75 = 0.750.75 UntukUntuk Order 2 :Order 2 : f(xi+1) = 0.5 + 0.25 * 1 + 1 * (1/2)(1/2)f(xi+1) = 0.5 + 0.25 * 1 + 1 * (1/2)(1/2) = 1.25= 1.25 KesalahanKesalahan pemotonganpemotongan RnRn = 1.5= 1.5 –– 1.25 = 0.251.25 = 0.25 UntukUntuk Order 3 :Order 3 : f(xi+1) = 0.5 + 0.25 + 0.5 + 0.25f(xi+1) = 0.5 + 0.25 + 0.5 + 0.25 = 1.5= 1.5 KesalahanKesalahan pemotonganpemotongan :: RnRn = 1.5= 1.5 –– 1.51.5 = 0 (= 0 (terbuktiterbukti))
  • 7. SoalSoal 1.1. DiketahuiDiketahui suatusuatu fungsifungsi :: dengandengan menggunakanmenggunakan DeretDeret TaylorTaylor padapada orderorder berapaberapa,, hasilhasil penyelesaianpenyelesaian numeriknumerik samasama dengandengan penyelesaianpenyelesaian eksakeksak,, perkiraanperkiraan fungsifungsi tersebuttersebut padapada titiktitik xi+1 = 0.5xi+1 = 0.5 berdasarkanberdasarkan nilainilai fungsifungsi padapada titiktitik xi=0?xi=0? 2.2. DiketahuiDiketahui suatusuatu fungsifungsi :: hitunghitung pulapula padapada titiktitik xi+1 = 0.25xi+1 = 0.25 dandan xi=0.xi=0.