Why this error message? Subscript indices must either be real positive integers or logicals.

Why do i get this error message

Subscript indices must either be real positive integers or logicals.

for i = 1:numel(matrix_a)
      handles.index_a = matrix_a(i)
      handles.index_b = matrix_b(i)

        for somthin
            [u v] = function(var_u(handles.index_a, handles.index_b)var_v(handles.index_a,  handles.index_b))
        end
end

pls help

[Ben11]

well it looks like the "somthin" you use in the 2nd loop is not made up of real positive integers or logicals. Can you show what it is?

[Antonio]

This ist "somthin"

number = 0:2*pi/1000:2*pi

Answer 1

[the cyclist]

Just a guess, but ...

You are using handles.index_a and handles.index_b as indices into var_u and var_v. Because handles.index_a traces back to matrix_a, I am guessing that matrix_a (or b) has some entries that are not positive integers, and therefore cannot be used as an index.

[Image Analyst]

I think that's it. Also Antonio, if this is actual code, not pseudocode, you need a comma before var_v and you can't name functions "function" since that's a reserved word.

[Antonio]

thats right. matrix_a and matrx_b are both 52x52 matrices. matrix_a has the first column just zeros and in matrix_b ist the first row filled with zeroes. How can i make it right. Any idea

[Antonio]

no thats just pseudocode, there is a comma and the function name is another

[the cyclist]

There is a conceptual error in your code, that I don't think we can fix for you. If the first column of matrix_a has a zero, then it cannot be an index. The code simply needs to be rewritten such that you really only access the indices you want.