Release a Message in GUI to user when calculation can't be performed

Hello everyone,

I am writing an app in GUI to make calculation on Matrices such as: addition, Substraction,...,

But how could I release a message when two entered matrices (say A, B) have their dimensions to be not matched to perform the operation like: A+B (e.g size(A)=[2,3],size(B)=[2,2],..).

Thank you.

Answer 1

[Simon Chan]

A sample example as follows, you may modify it to suit your purpose:

A = [1 2 3 4; 2 3 4 5];
B = [3 4 5; 4 5 7];
fig = uifigure;
if any(size(A)~=size(B))
    uialert(fig,'Dimensions of matrix A & B are not matched','Warning','Icon','warning');
else
    C = A+B;
    uialert(fig,'Calculation finished','Message','Icon','success');
end

[Tie Dihn]

Thank you Simon Chan,

So, each time I check for the compatibility, I have to use different approach, dont I? e/g.: When check for the multiplication between matrices: A*B, A^-1, det(A),... and so on. Hence, in my editbox, I have a string that the user entered, say: A-B*C+(A-D)'*E^-1, to check for this sequence to be corrected to implement, I have to perform my check for any single operation? I would like to know if there is any way that tell me a clue that after hitting pushbutton, the user could know that they need to check by their own the expression they entered without specifying what is this (which kind of operation is imcompatible is ignored)

[Rik]

That sounds like you could simply use a try-catch-block.

[Tie Dihn]

I understood then. Thank you all!!!