Variable dimension mismatch problem in a Matlab function block

Hello!

I am getting an error regarding a mismatch between the size of two variables in a Matlab function block:

Dimension 1 is fixed on the left-hand side but varies on the right ([15 x 500] ~= [:15 x :500])

Basically, I have an input variable, A, whose size is variable, and a output variable B, whose size is always [15,500]. Depending on the size of A, the function generates in a different way. For example:

dim_A=size(A);
if dim_A(1)==15
  B=A;
else
  B=zeros(15,500)
end

The thing is that every time dim_A(1)==15, A's size must be [15,500]. I have also tried to use:

if dim_A(1)==15 && dim_A(2)==500 
  ...
end

but whiout result. The funny thing is that I used exactly the same block in another model and it works there!!

Does anybody know what is going on there??

Thanks a lot! Pablo

Answer 1

[Walter Roberson]

Try

B = A(1:15,1:500);

even though you know that is the original size, this would provide a clear hint to MATLAB as to the output size.

Answer 2

[Pablo García Auñón]

Thanks Walter! I worked!