Matlab: if the condition when the two-dimensionality of two matrices is not equal

Question

I have two matrices that depend on the choice, there will be some other calculations. For example, suppose:

A = 8 9 3 9 6 5 2 1 9 

and

 B = 11 9 11 8 2 2 2 8 9 8 11 5 1 9 1 11 11 10 5 4 6 9 11 8 1 

Now I would choose one of them as the new matirix

 C = A; C = B; 

If I use the following if condition, I will have an error.

 if C==A %do some computation else if C == B %do some other computation else %print an error 

Since the dimension of the matrices is not equal, then I have an error. Could you tell me how I could formulate this correctly?

Answer 1

MATLAB provides a function to evaluate the equality of an array: isequal .

So try:

 if isequal(C,A) %do some computation else if isequal(C,B) %do some other computation else %print an error 

Answer 2

You can add another condition for the size, note that if the size condition is not met, the second condition is not checked, so you will not get an error:

 if all(size(C)==size(A)) && all(C==A) %do some computation elseif all(size(C)==size(B)) && all(C == B) %do some other computation else %print an error end 

Note that the condition must be all(C==A) .