1. Matlab 7
Lec 2-Fundamentals

2. Topics
variables, operators and expressions;
arrays (including vectors and matrices);
basic input and output;
repetition (for);
decision (if);

3. Variables
must start with a letter
can be alphabets (a-z), digits 0-9,underscore(_)
may be as long as you like
Matlab rem only first 31 characters
Eg r2d2 dhoni walle nano etc
Pay – day ,2s , name$ galtiyaaaaaaaannnn????????
Official Matlab Documentation refers variables as Arrays
scalar or vector
error message:
??? Undefined function or variable ...

4. Matlab is Case Sensitive
camel Caps method eg. camelCaps
Command and Function names are case sensitive

5. Workspace
variables you create during a session remain in workspace
untill you clear them using clear
whos – size of variables who diff dekho
ans – function=lastvalue of exp evaluated but not
assigned to a variable
example socho!
double = holds a numeric value = double precision
floating point
clear vname1 vname2
Workspace Browser

6. the myconstant.m example
g=9.8;
avo=6.23e23
run myconstant at start of session,Workspace is loaded

7. Arrays : Vectors and Matrices
Basic Idea Of a Matrix – Rows and Columns
Vector – Special Type of Matrix,1 Row,1 Column;
called list or arrays in some other Prog Lang
Matlab Handles Vectors and Matrices in a Same Manner

8. Vectors
Enter a statement in command line :
x = [1 3 0 -1 5]
Now enter disp(x) to see vector kaise dikhta hai
Also try y = [2,3,5]
Then whos command or size(y) command
Iska o/p kya hoga ? : - x =[130-15] bataaaaaoooooo?????
a = [ 1 2 3]
b = [4 5]
c = [ a –b]
Iska o/p bataaaaaooo ab????????

9. Iske bare me kya khyal hai?? :
a = [1 3 7];
a = [a 0 -1];
Vector can also be initialized as
x = 1:10;
x = 1:0.5:4;
x=1:2:6 try karo! Kya galti hai statement me????
x=0:-2:-5
This is list method of initializing!make sure
1.Elements in list must be enclosed in square bracket
2.Shud be separated by either space or commas

10. Ek aur tarika hai ki ap linspace function use karo!
Yeh try karo
linspace(0,pi/2,10)
Ye 10 equally space points ka vector create karta hai
0 and pi include karke

11. Transposing vectors sanjhte hai ab:::
Abhi tak Row vectors me khel rahe the abhi column vectors me
ate hai!
U need to transpose the row vectors to get column vectors
Try this
y=[ 1 4 8 0 -1]’
Sign used is the aposthrophe

12. Ab ati hai vectors ki subscripts:
Try this
Row vector of 7 random nos
r = rand(1,7)
Ab try karo
r(3)
Isme joh no. 3 dale hai who subscript hai!
Iske jawab do sochke and karke
r(2:4)
r(1:2:7)
r([1 7 2 6])

13. Conclusion abt subscripts:
Subscript is indicated inside () brackets
It may be a scalar or vector
Subscript always starts at 1
Fractional subscripts r always rounded down
x(1.9) will be x(1)

14. Matrices
Matrix = rows and columns
Try this
a = [ 1 2 3;4 5 6 ]
Ab apna transpose ka knowledge jhalkao!!!!
Try a’
Hum matrix same length ke vectors se bhi bana sakte hai!
x=0:30:180;
table = [ x' sin(x*pi/180)']

15. Capturing o/p
Either copy paste
Ya try this
diary kp2
diary off

17. DANCE TIME SURPRISE

18. Problem statement:
The equation for vertical motion under gravity is given by
S = ut – ½ gt^2
We ve to compute the value of s over a period of abt 12.3 sec
At intervals of 0.1 sec
Initial velocity 60 m/sec lijiye g = 9.8
M-file banaiye
Sabse pahile 4 points ka structure plan sochiye and paper pe
likhiye!next silde se match karke dekhiye ki kya ap sahi hai
ya ap kitte sahi hai????

19. Structure Plan
1. Assign the data (g, u and t) to MATLAB variables.
2. Calculate the value of s according to the formula.
3. Plot the graph of s against t.
4. Stop.

20. t wala statement vector initialize karta hai
. Operator ko dekho ye vectors ke liye hai!bad hum discuss
karenge!
Formula for s is evaluated for every element of vector t
making another vector
Disp command ka use table display ke liye
,,,, and … ka use

21. OVERRRRRRRRR aj ke liye