MATLAB: Problems with multiplications (matrix dimensions must agree) on F5, but not on F9

created functiondimensionmultiplication

I have this code:
function [Pex] = ponderacaoPorEspecies(probabilidadeDeExtincao)
        % Este módulo pondera a probabilidade de extinção das espécies em
        % função das forças de interação entre espécies. A probabilidade
        % varia em função de uma proporção dela mesma.
global forcaDeInteracoesEntreEspecies probabilidadeDeExtincao Especies
Pex = probabilidadeDeExtincao .* (1 - forcaDeInteracoesEntreEspecies);
It is used by another code, where the variables are given. After I F5 this main code, I get:
"_??? Error using ==> times Matrix dimensions must agree.
Error in ==> ponderacaoPorEspecies at 7 Pex = probabilidadeDeExtincao .* (1 – forcaDeInteracoesEntreEspecies);
Error in ==> compilador at 68 probabilidadeDeExtincao = ponderacaoPorEspecies(probabilidadeDeExtincao)_"
However, if I get to the fuction code above, select the line:
Pex = probabilidadeDeExtincao .* (1 - forcaDeInteracoesEntreEspecies);
And press F9, the results shows normally. Whats is going on?

Best Answer

Your variable 'probabilidadeDeExtincao' is an input argument to the function, while it is also a global variable. This could be the problem.
In any case, it should be relatively easy to debug this problem. Set a break point in your main code, press F5 and then F10 to step through the code. Press F11 to step into the function. When it reaches this line, go to Command Window, check the size of the variable 'probabilidadeDeExtincao' and 'forcaDeInteracoesEntreEspecies', you'll find the problem.
size(forcaDeInteracoesEntreEspecies)
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