Chapter - Matlab Vectors and Matrices and Basic Instructions, PPT, ADC, Semester, Engineering - Computer Science Engineering (CSE) PDF Download

 Introduction

The slides cover the following topics:

1. Vectors and Matrices

2. Matrix Calculations

3. Loops

4. for Loop

5. while Loop

6. Logical Operations

7. if statement

8. if-else statement

9. Functions in Matlab

10. Plotting in Matlab

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Vectors and Matrices

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Vectors and Matrices

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Some Special Vectors and Matrices

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Matrix Calculations

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Solving Simultaneous Equations Ax=b

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Loops

• for   and

• while

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for loop

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for loop (contd.)

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for loop (contd.)

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while loop

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Logical Operators

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Some more logical operators

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if statement

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if-else statement

 

•If-else is used if we want to perform two different tasks depending upon the condition is TRUE or FALSE.

 

 

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We wish to use “if” and “else” statement to decide upon if the input integer is an odd or an even number. The Matlab code for the purpose is shown below:

 

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Functions in Matlab

•Functions are actually computer routines(programs) to perform specific task.

 

•Matlab is rich in built-in function

 

•A function is called, user gives specific input(s) to the function, which generates the required output(s).

 

 

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Example of built-in functions

 

•Our objective is to calculate mean or average of certain vector ‘x’.

 

•We call the built in function “mean” of Matlab and give ‘x’ as an input to the function.

 

•The mean is calculated and is stored in variable ‘y’.

 

 

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•We can also built our own functions and call them when required.

 

•The functions are the m-files.

 

•For example for a given quadratic equation we wish to calculate the roots of equation. So we build our own function “call” and use the quadratic formula to solve for x1 and x2.

 

 

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•In our main program the function is called and the inputs ‘a’, ‘b’ and ‘c’ are given to the function which calculates the required roots

 

 

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Plotting in Matlab

 

•Matlab uses “plot” command to plot the curves with different line style and colors

 

•Example follows:

 

 

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