Why do I receive error message "This requires the Fixed-Point Designer license." for a simple matlab function?

Question

Dolf 2023-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/2035094-why-do-i-receive-error-message-this-requires-the-fixed-point-designer-license-for-a-simple-matlab

回答： Andy Bartlett 2023-10-18

Hello all,

I have included a Matlab Function block in my Simulink model with a very simple script. The script checks if a certain limit is exceeded and adjusts input values until it no longer exceeds the limit.

The funcion looks like this:

function adapter_angles = fcn(total_angle,support_angle,adapter_angles)
for i = 1:length(total_angle)
    while total_angle(i) > 85
        adapter_angles(i) = adapter_angles(i-1);
        total_angle(i) = support_angle + adapter_angles(i);
    end
end

total_angle is calculated before this script and is simply support_angle + adapter_angles. adapter_angles is a 1x4 array and support_angle is a constant.

When I try to run the Simulink model, Simulink throws the error message "This requires the Fixed-Point Designer license." I don't understand why this simple script would require an additional license. I am using Matlab Simulink version 10.6(R2022b). I am not using any exotic data types.

the Simulink submodel looks like this:

Has anyone encountered this problem before? How do I get around this?

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Answer 1

Dolf 2023-10-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2035094-why-do-i-receive-error-message-this-requires-the-fixed-point-designer-license-for-a-simple-matlab#answer_1335464

I have found the problem. The data type going into the gain blocks is Int32. When multiplied by 0.01, the output data type is sfix64_En37 by default. This caused the fixed-point issue later in the script. Solved this by setting the gain signal attributes -> output data type to "Inherit: Same as input"