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Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
Matlab 4
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Matlab 4

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Transcript

  • 1. MATLAB Lecture-4
  • 2. Relational Operators Ex- a=[1 2 3]; b=[1 2 2]; a==b returns ans=1 1 0 since the last case did not match. Relational Operator Meaning < Less than <= Less than or equal > Greater than >= Greater than or equal == Equal ~= Not equal
  • 3. Logical Operators and Functions Logical Operator Meaning & And | Or ~ Not Function Name Description ischar(x) Returns a 1 if x is a character string & 0 otherwise isfinite(x) Returns a 1 if elements of x are finite else 0 isinf(x) Returns 1 where elements of x are infinite else 0 ismember(x,y) Returns 1 when elements of x are also in y else 0 isreal(x) Returns 1 whenever the elements of x have no imaginary part and a 0 otherwise
  • 4. If Statement
    • Simple if Statement
    • if logical expression1
    • statement group1
    • end
    • Nested if statement
    • if logical expression1
    • statement group1
    • if logical expression2
    • statement group2
    • end
    • statement group3
    • end
    • statement group4
  • 5. If else statements
    • if else statement
    • if logical expression1
    • statement group1
    • else
    • statement group2
    • end
    • if elseif statement
    • if logical expression1
    • statement group1
    • elseif logical expression2
    • statement group2
    • end
  • 6. If elseif else statement
    • if logical exression1
    • statement group1
    • elseif logical expression2
    • statement group2
    • elseif logical expression3
    • statement group3
    • elseif logical expression4
    • statement group4
    • else
    • statement group5
    • end
  • 7. Switch-case statement
    • switch switch expression
    • case value1
    • … ..
    • … ..{ Group 1 of Commands}
    • case value1
    • … ..
    • … ..{ Group 2 of Commands}
    • otherwise
    • … ..
    • … ..{ Group 3 of Commands}
    • end
  • 8. Assignment-1
    • Using a MATALAB function file write a code for A/D converter (if else) where ‘x’ is i/p and ‘y’ is digital o/p governed by following eq.
    • y=0 x<-2.5
    • =1 -2.5 < x<-1.5
    • =2 -1.5 < x<-0.5
    • =3 -0.5 < x<0.5
    • =4 0.5 < x<1.5
    • =5 1.5 < x<2.5
    • =6 2.5 < x<3.5
    • =7 x > 3.5
    • Test for condition with amplitudes -1.25, 2.57 and 6.
  • 9. Solution using if else
    • function y_dig=bitatd_(x-analog)
    • if x-analog<-2.5
    • y_dig=0;
    • elseif x-analog>=-2.5 & x-analog<-1.5
    • y_dig=2;
    • …… .(so on) elseif x-analog>=2.5
    • y_dig=6;
    • else y_dig=7;
    • end
  • 10. For loops
    • It allows a group of statements to be repeated a fixed number of times.
    • for index = expression
    • statement group X
    • end
    • expression may be of the form m:n or m:i:n
    • where m is beginning value, n is ending value and i is increment.
  • 11. Assignment-2
    • Find out the squares of integers from 1 to 100 and show their sum.
    • Fill a 10 by 20 matrix with unity to demonstrate the use of nested ‘for’ operations
  • 12. Solution
    • sum=0;
    • for i=1:100
    • sum=sum+i^2;
    • end
    • sum
    • n=10;
    • m=20;
    • for i=1:n
    • for j=1:m
    • b(i,j)=1;
    • end
    • end
    • b
  • 13. While Loops
    • A while loop allows one to repeat a group of statements as long as the specified condition is satisfied.
    • while expression1
    • statement group1
    • end
    • statement group2
  • 14. Assignment-3
    • Determine the number of consecutive integers that when added together will give a value equal or just less than 210.
  • 15. Solution
    • int=1;
    • int_sum=0;
    • max_val=210;
    • while int_sum<max_val
    • int_sum=int_sum+int;
    • int=int+1;
    • end
    • last_int=int
    • if int_sum==max_val
    • num_int=int-1
    • tt_int_ct=int_sum
    • elseif int_sum>max_val
    • num_int=int-1
    • tt_int_ct=int_sum-last_int
    • end
  • 16. Some basic I/O commands Command Description break Exits while or for loop disp Displays text or matrix echo Displays m-files during execution error Displays error messages format Switches output display to a particular format fprintf Displays text and matrices and specifies format for printing values input Allows user input keyboard Invokes the keyboard as an m-file pause Causes an m-file to stop executing, pressing any key causes resumption of program execution
  • 17. Assignment-4
    • Using disp Command generate the following matrix:-
    • 1 0 0
    • 0 1 0
    • 0 0 1
    • The above matrix should be generated using (a) Iterative method (b) Basic MATALAB command in one line.
    • 2. Write a User friendly MATLAB program which should enter the age of the user and display an error message if age<0 and ask the user again to enter the age.
  • 18. Solution 1
    • a.) clc; clear all; close all;
    • for i=1:3
    • for j=1:3
    • if i==j
    • a(i,j)=1;
    • else
    • a(i,j)=0;
    • end
    • end
    • end
    • b.) disp(eye(3,3))
  • 19. Solution 2
    • clc; clear all; close all;
    • x=input(‘Enter your age’);
    • if x<0
    • error(‘Wrong age entered’);
    • end
    • x=input(‘Enter your age’);

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