Use
dbstop if error
to stop the code at the point in the function where the error is. I can't imagine why you would ever want 200 variables in a single function, but that is another matter entirely.
If you wish you can dump them all to a .mat file using
save( filename )
at some point, including at the point the above will stop in your code.
The whole point of a function though (well, one of the key points, at least) is to encapsulate the variables within a sealed workspace of the function and not contaminate the workspace that called the function so debugging with stop on errors is the simplest way.
