What's function does replace LINALG::SUBSTITUTE (A,B,m,n)?

I'm searching for matlab function which replaces linalg::substitute (A,B,m,n); it allows me replace a part of original matrix A, with a submatrix B, starting from A raw m and A column n.

Thank you.

Answer 1

[Stephan]

Hi,

you can use this function:

function result = linalg_substitute(A,B,m,n)
    [mA, nA] = size(A);
    [mB, nB] = size(B);
    result = A;
    if mB+m-1 > mA || nB+n-1 > nA %Ignore values out of range
        return
    else
        result(m:mB+m-1, n:nB+n-1) = B;
    end
end

Result is for example:

>> A = zeros(5)

A =

     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0

>> B = ones(3)

B =

     1     1     1
     1     1     1
     1     1     1

>> C = linalg_substitute(A,B,2,2)

C =

     0     0     0     0     0
     0     1     1     1     0
     0     1     1     1     0
     0     1     1     1     0
     0     0     0     0     0

Simply save the function as linalg_substitute.m in your Matlab path. Then you can use it always you need it.

Best regards

Stephan