diff options
Diffstat (limited to 'Build/source/utils/pmx/pmx-2.6.17/libf2c/c_sqrt.c')
-rw-r--r-- | Build/source/utils/pmx/pmx-2.6.17/libf2c/c_sqrt.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/Build/source/utils/pmx/pmx-2.6.17/libf2c/c_sqrt.c b/Build/source/utils/pmx/pmx-2.6.17/libf2c/c_sqrt.c new file mode 100644 index 00000000000..1678c534d60 --- /dev/null +++ b/Build/source/utils/pmx/pmx-2.6.17/libf2c/c_sqrt.c @@ -0,0 +1,41 @@ +#include "f2c.h" + +#ifdef KR_headers +extern double sqrt(), f__cabs(); + +VOID c_sqrt(r, z) complex *r, *z; +#else +#undef abs +#include "math.h" +#ifdef __cplusplus +extern "C" { +#endif +extern double f__cabs(double, double); + +void c_sqrt(complex *r, complex *z) +#endif +{ + double mag, t; + double zi = z->i, zr = z->r; + + if( (mag = f__cabs(zr, zi)) == 0.) + r->r = r->i = 0.; + else if(zr > 0) + { + r->r = t = sqrt(0.5 * (mag + zr) ); + t = zi / t; + r->i = 0.5 * t; + } + else + { + t = sqrt(0.5 * (mag - zr) ); + if(zi < 0) + t = -t; + r->i = t; + t = zi / t; + r->r = 0.5 * t; + } + } +#ifdef __cplusplus +} +#endif |