Dear all, I'm new to ginac, and very eager to learn more about it. I installed the latest (1.6.2) version on a recent (mountain lion 12.2.1) system, using the automatic packaging system 'homebrew'. 1. There must be a bug somewhere along the line, because the most naive, simple program from the manual (and all other examples I tried) cause a malloc error: % cat x.C #include <iostream> #include <ginac/ginac.h> int main() { GiNaC::symbol v("v"); std::cout << v << std::endl; return 0; } % g++ x.C -lginac && ./a.out v a.out(31763) malloc: *** error for object 0x7fff7b419570: pointer being freed was not allocated *** set a breakpoint in malloc_error_break to debug Abort trap: 6 2. Setting matrix entries causes crash: ... GiNaC::matrix m(10,10); m[1][2] = 1; ... causes "libc++abi.dylib: terminate called throwing an exception" 3. I can't find the tensor product of matrices (aka Kronecker product) in the documentation. If M in an axb matrix and N is a cxd matrix, this would be the (ac)x(bd) matrix with entries the products of entries of M and N. While it's easy to implement myself, I'm surprised not to find it in the library. Did I miss something? I'm not sure I know well how this mailing list works, so I'd appreciate a reply directly to my email address. Thanks in advance, Laurent -- Prof. Dr. Laurent Bartholdi \ laurent.bartholdi<at>gmail<dot>com G.-A. Universität zu Göttingen \ Phone: +49 551 39 7826 Bunsenstraße 3-5 \ Secr: +49 551 39 7752 D-37073 Göttingen, Germany \ Fax: +49 551 39 22674