variable length vectors crashing simulation

Hi,

I have developed a rather large simulink model with simulink functions and also some matlab functions. In an previous approach I had to use some variable length vectors which I defined as such, however I was able to get rid of all of them. Occasionally (in seemingly random cases) I get an error that I can not track down further and do not understand where it appears and originates and under what circumstances.

It reads: "An error occurred while running the simulation and the simulation was terminated

Caused by:

If X is a variable-length vector, it must not have length 1: scalar X must be fixed-size.

Component:Simulink | Category:Block error -Open-"

If I click on open, nothing happens unfortunately.

A google search only brought up this toolbox from harvard(?): https://surfer.nmr.mgh.harvard.edu/pub/dist/freesurfer/tutorial_packages/OSX/MCRv83/v83/resources/Coder/en/toolbox.xml

I would greatly appreciate any help to locate this tiny bug that crashes the entire simulation or approaches on how this could be located eg with the debugger. I had no luck with that.

Thanks,

Vincenz

Answer 1

[Vincenz Frenzel]

After another day of working with simulink I found the error. It was the command

h = hist(vector,unique(vector));

to find out which value in vector appears how often. Therefore h is variable in size. If all entries are the same though, h is length 1 which is obviously not acceptable.

Poor error reporting by MathWorks!

If this helped anyone, letr me know

Vincenz