Why Matlab Coder is slow?

Question

I'm trying to build a Mex function in Matlab-r2015a using Matlab Coder. The entry point function I want to convert is alg.m which is called by main.m.

Following the procedure, I'm at the step in which I'm asked to "define the type of each input for every entry point function". I choose the automatic procedure and enter main.m

My problem is: in order to define the type of each input, the Matlab Coder takes a very long time; the same problem appears at the next step, when I have to check whether there are issues in the Matlab code. Is that because Matlab has to execute the whole main.m+alg.m?

I suspect this should be the case because when I impose values of parameters that make the computation faster, the input types and issue checks are done immediately. Anyway, I would like to have some more explanations and, if any, suggestions to solve the problem.

Answer 1

You are correct, both steps Define Input Types and Check for Run-Time Issues run main.m which will in turn run alg.m.

If the input data types for the entry-point function don’t change, two test-benches (namely two versions of your main.m) can be written – a shorter one that invokes the entry-point once for defining input types, and a more comprehensive one that thoroughly exercises alg.m. The former can be used to quickly define input types, and the latter should be used when checking for run-time issues.