Communication between CLIPS (Expert System) - MATLAB and CLIPS - C

Hello evrybody, I have a mex-file function called "amortiss.c" and I want to connect it to CLIPS (Expert System Tool). Infact, I want to pass the variable "result" returned by the function "amortiss.c" to CLIPS so that it compares this "result" to 1 and then displays messages depending on the comparaison

if (result <1) then (do...); else if (result ==1) then do (...); According to the Clips user guide I should define an external function called user-defined function. The problem is that this function is a CLIPS function written in C ..and I don't see how it helps me connect my "amortiss.c" to CLIPS.

Is it also possible to connect Clips to Matlab? (communication between .clp file and .m file)?

I appreciate all your suggestions and advice.