Different math rounding behaviour between Linux, Mac OS X and Windows

Question

HI,

I developed some mixed C/C++ code, with some intensive numerical calculations. When compiled in Linux and Mac OS X I get very similar results after the simulatio

Answer 1

In addition to the runtime rounding settings that people mentioned, you can control the Visual Studio compiler settings in Properties > C++ > Code Generation > Floating Point Model. I've seen cases where setting this to "Fast" may cause some bad numerical behavior (e.g. iterative methods fail to converge).

The settings are explained here: http://msdn.microsoft.com/en-us/library/e7s85ffb%28VS.80%29.aspx