mat lab introduction and basics to learn

Mar 14, 2014Download as pptx, pdf

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This document provides an overview of MATLAB, including its common uses in engineering fields like rocket design, its basic commands and functions for mathematics, matrices, polynomials, and more. Key features of MATLAB covered include its command window, editor, predefined math functions, matrix commands using colons, reading and writing files, and basic programming statements.

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mat lab introduction and basics to learn

 Mat lab is very useful in design field now a days it is
widely using software
 It has so many predefined functions
 It is space sensitive and case sensitive
 It is used in rocket launching and designing of
mechanical parts

Some Mat Lab development windows
 Command Window : where you enter commands
 Command History : It shows the previously entered
commands
 Editor : Here we edit programs

COMMANDS
 CLEAR : remove items from workspace
 WHO: list variables in workspace
 QUIT: close matlab

Math Functions
 Abs(x)=mod x
 Sqrt(x)=root x
 Round(x)=rounds to nearest
integer
 Fix(x)=round to nearest integer
towards zero
 Ceil(x)=nearest to infinite
 Ceil(x)=nearest to –ve infinite
 Rem(x,y)=gives remainder
 Exp(x)=e^x
 Log(x)=log x base e
 Sin(x)
 Cos(x)
 Tan(x)
 sinh(x)
 Cosh(x)
 Tanh(x)

Matrix entering in mat
 A=[1 2 3;2 3 4]
 Output we get here is
1 2 3
2 3 4

Colon for matrix
A(:,n) = selects all row elements in nth column of A
A(n,:) = selects all column elements in nth row of A
A(:,m:n)=selects all rows b/w columns m & n
A(m:n,:) = selects all columns b/w rows m &n
A(m:n,p:q) = selects elements in rows b/w m & n and
colmns b/w p &q
Isequal(a,b) = if element in a=b returns 1 otherwise 0
Ismember(a,b) = if a element in b returns 1 otherwise 0

Some more commands
 Magic(x)
 Sum(x)
 X’
 Diag(x)
 Fliplr(x)
 Flipud(x)
 Size(x)
 X(i,j)=n
 Length(a)
 Mean(A)
 Max(a)
 [d,n]=max(a)
 Min(a)
 Sort(a)
 Median(a)
 Std(a)
 Rand
 Rand(m,n)

Some functions
1 . Syms x
f = inline (‘x^2+2x+1)
2 . Syms (u,v)
simplify((u^3-v^3)/(u-v))
3. Syms a
syms b
syms c
syms x
solve(‘a*x^2-b*x+c)

Solving polynomial
 5*s^5+7*s^4+2*s^3+6*s+1
 To enter into the mat lab software for working
 x=[5 7 0 2 6 1]
 At the value of s=2
 Enter
 X=polyval([x],2)
 X=278

Muliplying two polynomials
 Here we write
 X=[1 2 3]
 Y=[3 4 5]
 Z =conv(x,y)
 Z=2 11 29 35

Statements
 If/elseif/else
 For loop
 While loop

Reading & writing diff files
For reading text files
X = dimread(‘abc.txt’,’,’)
For writing text files
X=[1 2 3 5 7 ]
dlmwrite(‘uvw.txt’,x);
For xls files enter xls in place dlm
Reading image files
F=uigetfile(‘*.m,*.bmp,*.gif,*.jpg’,’xxxxx’)
For plotting graphs
Plot(x,y)

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