> I have investigated your problem on all Unix platforms and NT. > NT is effectively given the "wrong" result. All Unix platforms are OK. > The problem on NT is simply a rounding error problem. It is not a bug. > May be there is an option (Valery please could you check) to optimize > floating point rounding with VC++. There is a Visual C++ runtime library function called _controlfp() which sets the IEEE floating-point status word. The syntax is _controlfp(value, mask); the mask indicates which bits of the status word you want to change. There are lots of constants defined for various parts of this word. In order to set round-to-nearest mode, the syntax would be: _controlfp(_RC_NEAR, _MCW_RC); The other rounding mode choices are _RC_CHOP, _RC_UP, and _RC_DOWN. ------------------------------------------------------------------------------- -- Fred Gray Graduate Student -- -- fgray@physics.uiuc.edu Department of Physics -- -- University of Illinois at Urbana-Champaign -- -------------------------------------------------------------------------------
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