mat lab introduction and basics to learn

mat lab introduction and basics to learn

• 2.
   Mat labis 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
• 3.
  Some Mat Labdevelopment windows  Command Window : where you enter commands  Command History : It shows the previously entered commands  Editor : Here we edit programs
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  COMMANDS  CLEAR :remove items from workspace  WHO: list variables in workspace  QUIT: close matlab
• 5.
  Math Functions  Abs(x)=modx  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)
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  Matrix entering inmat  A=[1 2 3;2 3 4]  Output we get here is 1 2 3 2 3 4
• 7.
  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
• 8.
  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)
• 9.
  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)
• 10.
  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
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  Muliplying two polynomials Here we write  X=[1 2 3]  Y=[3 4 5]  Z =conv(x,y)  Z=2 11 29 35
• 12.
  Statements  If/elseif/else  Forloop  While loop
• 13.
  Reading & writingdiff 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)