Octave (3.Matrix Calculation)

>> A = [1 2; 3 4; 5 6];

>> B = [1 2 3; 4 5 6];

>> A * B

ans = 9 12 15 19 26 33 29 40 51

>> C = [2 3; 4 5; 6 7];

>> A .* C    % the every elements of matrix A multiple every elements of matrix C

ans = 2 6 12 20 30 42

>> A .^ 2

ans = 1 4 9 16 25 36

 

>> A'    % transpose

ans =

 

   1   3   5

   2   4   6

 

>> a = [1 2 3 4]

a =

 

   1   2   3   4

 

>> max(a)

ans =  4

 

>> A = magic(3)

A =

 

   8   1   6

   3   5   7

   4   9   2

 

pinv (X, TOL)

     Return the Moore-Penrose pseudoinverse of X.