The upsample function is not working R2022b

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Dear all,
For some reasons I had to reboot my machine and reinstalled Matlab, version 2022b.
I tried to run my previous and validated program but the function is raising an issue of type of the input arguments, which never happened before...
Even the examples of the help page do not work:
x = [1,2,3,4];
y = upsample(x,2)
y = 1×8
1 0 2 0 3 0 4 0
So I am a bit pissed off...
Anyone has suggestions?
Thanks a lot in advance.
Best regards,
louis tomczyk
Louis Tomczyk
Louis Tomczyk on 25 Sep 2022
Dear @Steven Lord, I mentionned 'type of the input arguments".
I checked both int8 and double class do not work for the second argument, see attached the screenshot.
Thanks again.

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Accepted Answer

Star Strider
Star Strider on 25 Sep 2022
I can find two upsample functions in the online documentation, one in the Signal Processing Toolbox (that should work with your code) and another one in the Control System Toolbox that will definitely not work with the posted code, since it requires a ‘system’.object as the first argument.
x = [1,2,3,4];
y = upsample(x,2) % Signal Processing Toolbox 'upsample'
y = 1×8
1 0 2 0 3 0 4 0
Be certain that you have the Signal Processing Toolbox licensed and installed.
If you have it and you are still getting the error, run:
which upsample -all
/MATLAB/toolbox/signal/signal/upsample.m /MATLAB/toolbox/control/ctrlmodels/@DynamicSystem/upsample.m % DynamicSystem method /MATLAB/toolbox/signal/signal/@gpuArray/upsample.m % gpuArray method
from a script or the Command Window. The result should look something like this.
If there is anything else, it would reveal a user-written function that is overshadowing the one you want to use. The solution is to rename the user-written function to something that makes sense in the context of your code and does not match any built-in MATLAB function names.

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