Building LAPACK and ATLAS under cygwin

Hi Apologies if this is a little off topic. I'm attempting to build the LAPACK library under cygwin using the optimized atlas blas library. I have gotten Atlas to compile correctly and have installed the library files in /usr/lib and the header files in /usr/include/atlas/. However i run into trou

How to return NaN?

Hi Sorry for the slightly off topic question, but i was wondering how best to have a function of type double return NaN in C. I'm using the cygwin environment for developement (so gcc), but am looking for the most portable solution. Thanks Jonathan. -- Unsubscribe info: http://cygwin.com/