String matching and data extract

Hello, I am trying to match two string arrays and extract a matrix of datas by using the results. When I try to do, I have this error. "Improper assignment with rectangular empty matrix" My code is

for i=1:length(A)
    I = strmatch(A(i), B, 'exact');
    unique_data_(i) = max(Data(I,:));
end

How can I do my work?

Thank you, Have a good day

Answer 1

[Guillaume]

I've never seen that exact error message (which version of matlab?) but your code is certainly going to produce an error if there is no match for an element of A since you'll try to assign empty to a scalar. And if there is more than one match and Data has more than one column, max(Data(I, :) is going to return a vector, which will also fail to be assigned to a scalar.

How to fix that depends on what you want to do in either case.

Also matlab tells me that "strmatch is not recommended. [...] To find an exact match for a string, use strcmp." Certainly, the way you're using it strcmp would actually be better.