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

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?

Answer 1

[Dolf]

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"

Answer 2

[Andy Bartlett]

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