📄 matrix_out.mht

📁 it is a very essential matlab code.

💻 MHT

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Date: Tue, 12 May 2009 09:57:59 -0700
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<BODY><PRE>&gt;&gt; a =3D [3 2 -1; -1 3 2; 1 -1 -1]                 % =
'a' 3X3 coeff matrix

a =3D
     3     2    -1
    -1     3     2
     1    -1    -1

&gt;&gt; b =3D [ 10; 5; -1]				 % 'b' RHS (load) vector

b =3D
    10
     5
    -1

&gt;&gt; x =3D a\b                                       % from a * x =
=3D b, solve for x

x =3D
   -2.0000
    5.0000
   -6.0000

&gt;&gt; a*x                                           % check that a * =
x =3D b

ans =3D
   10.0000
    5.0000
   -1.0000

&gt;&gt; inva =3D inv(a)                                 % determine =
inverse of 'a'

inva =3D
   -1.0000    3.0000    7.0000
    1.0000   -2.0000   -5.0000
   -2.0000    5.0000   11.0000

&gt;&gt; inva * a                                      % check that inva =
* a =3D [I]

ans =3D
    1.0000    0.0000    0.0000
    0.0000    1.0000    0.0000
    0.0000    0.0000    1.0000

&gt;&gt; inva * b                                      % show that inva =
* b =3D x

ans =3D
   -2.0000
    5.0000
   -6.0000

&gt;&gt; a'                                            % transpose of =
'a'

ans =3D
     3    -1     1
     2     3    -1
    -1     2    -1

&gt;&gt; cond(a)                                       % condition =
number of 'a'

ans =3D
   63.0547
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