I have matrix with "L" row and "N" column(L<N). I want to convert this matrix to N*N matrix. how can I do it in matlab?

Hello all, I having quite a bit of difficulty with some operator of matrixes.

assume "L "and "N" are arbitrary constant values and L<N.

I have (L-2*N-2)matrix and I want to sum this matrix with a (N-2*N-2)matrix so I need that two matrix have a equal dimension.

In my work I need to sum these two matrices. Can you help me with this??

for example A(3,5) and B(5*5)

and I need A+B.

How can I have these two matrices with equal dimensions?

[Image Analyst]

Please give full example of inputs and output.

[sona nil]

it is a part of my parogram that has 200 lines.

"A" is a matrix with L-2 * N-2 dimension.

"B" is a matrix with L-2 * N-2 dimension.

and (L<N)

I want to caculate A+B

[David Hill]

If the number of elements in each matrix do not match, you cannot reshape them so they can be added. You could pad the small matrix with zeros or delete elements from the larger matrix, but you are the one that must decide.

[Image Analyst]

Again, please give full example of inputs and output. Provide us small matrices of width 5 or 10. I also think you might want to read this link

Answer 1

[Steven Lord]

There are many ways to expand a matrix. Let's take one small example.

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

A is 2-by-3. If I wanted to make this a 4-by-3, which of the following would you want? Or is there another alternative?

z = zeros(1, 3);
n = NaN(1, 3);

A1 = [z; z; A]
A2 = [z; A; z]
A3 = [A; z; z]
A4 = [n; n; A]
A5 = [n; A; n]
A6 = [A; n; n]
A7 = repmat(A, 2, 1)
A8 = repelem(A, 2, 1)