Why am I unable to use a variable from my model workspace as the number of points in a scope?

I have a model, which contains a scope block. I have defined a variable k in my model workspace and want to use that number as the amount of datapoints in my scope. However when I try to use EVALIN to set this number to 'k', I receive the following error:

 Error using ==> evalin

 Undefined function or variable 'k'.

Answer 1

[MathWorks Support Team]

The expression from the 'Limit data points' field is evaluated in the MATLAB base workspace. In order to retrieve the value of k from your model workspace and put it in the base workspace so that the scope has access to it, you need to explicitly call the value from the MATLAB command line:

evalin(get_param(gcs, 'modelworkspace'), 'k')