Same number of Rows and Cols of a matrix (N*N)

Hello,

I would like to make a program that requires a matrix A to be square (n*n)

for exmple :

[a,b]=size(A)

if a ~= b
    input('Error')
end

Is there a matlab function for this ? without using [a,b]=size(A) ?

Thank you in advance

[Rik]

Backup of question:

Title:

Same number of Rows and Cols of a matrix (N*N)

Body:

Hello,

I would like to make a program that requires a matrix A to be square (n*n)

for exmple :

[a,b]=size(A)

if a ~= b
    input('Error')
end

Is there a matlab function for this ? without using [a,b]=size(A) ?

Thank you in advance

Answer 1

[Stephen23]

This will return false for non-square matrices, and also if ndims>2:

isequal(0,diff(size(M)))

It is easy to use with assert:

assert(isequal(0,diff(size(M))),'Input must be a square matrix')

Answer 2

[Matt J]

validateattributes(A,"numeric",{"square"})