ppt day1 final

7/31/2019 Ppt Day1 Final

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Department of Electrical Engineering

Indian Institute of Technology Kanpur (IIT K)

Abhishek Kr Gupta


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To MATLAB


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What is MATLAB? MATrix LABoratory

Does Matrix Operations

Thousands of inbuilt functions ToolBoxes

GUIS

A programming Language

A complete software package Simulink Modeling tools

EDA tools


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LAYOUT


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A Simple Start:Add two Variables

No definitions needed, no classes needed

On command window type:

Type C to see the value

C=9

>>A=5;>>B=4;>>C=A+B;


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Editors: Editors are used to store codes

Code is nothing but just a set of lines

M Files are used in MATLAB having extension .m Types:

Script File

Set of code lines

Function File A code implementing some functions like sin, cos exp (they

are inbuilt)


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Defining Matrices:Just write all the entries separated by the space or

comma and enclosed in a bracket []

A=[1 2 3 2]Or

A=[1,2,3,2]

For column matrix, put semicolon ; in between

A=[1;2;3;2]


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Importance of Matrix: Not just as a transformation

Also set of data or samples

Electrical Signals Performance outputs

Images

Also as model representation

Polynomials Transfer functions

Neural Networks


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Polynomials:

These are some of thePolynomials you haveCome across.


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Polynomials in MATLABA polynomial can be represented in the form of

coefficients. For example, if you want to write

You have to just write [1 2 2 5]

Each number represents the value of coefficients.

This will be represented as [1 0 2 5]


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System Modeling using Matrix:

Recall the well known example of LCR circuit:

Output across resistor V0=R.i

Modeled using matrix as

I

NPUT

O

UTPUT


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Similarly a Motor SystemA Motor Speed System

We write its state equations:


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Transfer Functions

Polynomials

[K2]

[1 2 K2]


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Neural Systems Systems modeled as a set of transformation with

neurons as Weight matrixes


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Problems with Other Programming

Languages No Matrix operations

For Loops everywhere

Lots of unnecessary lines


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with MALTAB


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Define Matrixs Mix , and ; to make 2 D matrix

A=[1 2 3 2; 1 3 2 1;2 3 6 1]

Make A 1 to 10 MatrixA=[1 2 3 4 5 6 7 8 9 10];

Make 1 to 100

Tired??

Use colon :Which mean TO

A=[1:100];


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Colon (:) = TO[1:4] Gives a vector from 1 to 4

1 2 3 4

[1:0.5:4]

Gives a vector from 1 to 4 with step 0.5

1 1.5 2 2.5 3 3.5 4

[0:0.1:2*pi]

Gives a vector containing 0 to 2


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Operators Matrix Operators

Y=A^2

Y=A^B

X=A*B

Dot Operators

Y=A.^2 X=A.*B

Y=A.^B


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Functions

Subscripting


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Typical MATLAB functions Mathematical

sqrt sin,cos,tan

Log, exp Creation

ones zeros eye

Rand Information

size length


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Typical MATLAB functions Matrix Operations

sum diag

transpose or inv det eig fliplr

reshape flipud rot90 repmat


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Concatenation of Matrices Suppose A, B, C are matrices

If we write [A B] or [A,B]

If we write [A;B] Similarly [A B C] and [A;B;C]

[[A B];C]


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Crete a with size 4x5

With elements from 3to7\

uGP

ppt day1 final

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