hello, I have created a very simple program with matlab 6.5 ( suma.m) .With the matlab compiler I have created suma.c and suma.dll and I am trying to call suma.dll from IDL: s= CALL_EXTERNAL('C:\RSI\IDL60\external\call_external\C\suma.dll','suma',a_d,b_d,/CDECL) and I get % CALL_EXTERNAL: Error loading sharable executable. Symbol: suma, File = C:\RSI\IDL60\external\call_external\C\suma.dll ERROR_PROC_NOT_FOUND What can I do? Thank you very much