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

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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?

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Answer 1

Walter Roberson 2015-8-29

在 MATLAB Online 中打开

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Before the final assignment to z, assign

z = 0;

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

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Walter Roberson 2015-8-30

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

Marie Behzadi 2015-8-30

编辑：Marie Behzadi 2015-8-30

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!!

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

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