Data is inferred as a variable size matrix, while its specified type is something else.

Let "x" and "y" be two variable-size vectors. now i have a variable named "z" which is defined as:

function z=func(input)
    % some code here
    % x,y are not input
    z = sum(x.*y')/sum(x);
end

obviously "z" is a double variable. but when i send it as the output of the function i get this error:

Data 'z' (#32) is inferred as a variable size matrix, while its specified type is something else.

I guess Simulink assumes that "z" is variable-size too. I'm stuck at this point. any suggestions?

Answer 1

[Walter Roberson]

Before the final assignment to z, assign

z = 0;

This will tell Coder that the result is expected to be a scalar double.

[Marie Behzadi]

Thanks Walter for your suggestion. But it didn't work. The error is still the same.

[Walter Roberson]

Did you specifically mark a data type for the output signal for the MATLAB Function Block ?

[Marie Behzadi]

not specifically. I just assign it to zero at first. I guess it will consider it as a double value; and then the result of calculation is always a double value. It's not a even vector or matrix but the error refers to a variable-size assignment!!