Hi, I am trying to use weave to speed up my code with inline c++ code, but I can't find any working sample. I found a very simple one [1] to return the trace of a matrix, but I can't find how to incorporate the c++ code. I attached the compile errors. I also tried to remove the "type_converters" parameter in inline and change the array parentheses () into brackets [], then it compiles but gives wrong results... I am running on Ubuntu with python2.4-scipy-core=0.3.2-2ubuntu1 python2.4-scipy=0.3.2-3ubuntu2 python2.4-numeric=23.8-4 python2.4-numeric-ext=23.8-4 blitz++=1:0.8-4 (just in case) gcc version is 4.0.2 Any ideas? Evan [1] http://amath.colorado.edu/faculty/fperez/python/weave_examples.html ps: here is the code that I ran ---- import scipy from weave import converters, inline def trace(mat): """Return the trace of a matrix. """ nrow,ncol = mat.shape code = \ """ double tr=0.0; for(int i=0;i<nrow;++i) tr += mat(i,i); return_val = tr; """ return inline(code,['mat','nrow','ncol'], type_converters = converters.blitz) M = scipy.rand(3,3) trace(M) ----