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

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Dolf
Dolf 2023-10-18
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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采纳的回答

Dolf
Dolf 2023-10-18
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"

更多回答（1 个）

Andy Bartlett
Andy Bartlett 2023-10-18
Showing the data types on the Simulink signal lines can be very helpful when investigating.
Open the model in question
Then at the MATLAB command line do
set_param(bdroot,'ShowPortDataTypes',1)
On the next simulation, code generation, etc. the data types used will be displayed on each signal line.
This can also be set via a model's toolstrip.
DEBUG tab
Diagnostics group
Information Overlays
Ports
Base Data Types

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