d_sign.c

来自「SuperLU is a general purpose library for」· C语言 代码 · 共 13 行

#include "f2c.h"

#ifdef KR_headers
double d_sign(a,b) doublereal *a, *b;
#else
double d_sign(doublereal *a, doublereal *b)
#endif
{
double x;
x = (*a >= 0 ? *a : - *a);
return( *b >= 0 ? x : -x);
}