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| author | shmel1k <shmel1k@ydb.tech> | 2022-09-02 12:44:59 +0300 |
|---|---|---|
| committer | shmel1k <shmel1k@ydb.tech> | 2022-09-02 12:44:59 +0300 |
| commit | 90d450f74722da7859d6f510a869f6c6908fd12f (patch) | |
| tree | 538c718dedc76cdfe37ad6d01ff250dd930d9278 /contrib/libs/libf2c/z_sqrt.c | |
| parent | 01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff) | |
| download | ydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz | |
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/libf2c/z_sqrt.c')
| -rw-r--r-- | contrib/libs/libf2c/z_sqrt.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/contrib/libs/libf2c/z_sqrt.c b/contrib/libs/libf2c/z_sqrt.c new file mode 100644 index 0000000000..35bd44c8e0 --- /dev/null +++ b/contrib/libs/libf2c/z_sqrt.c @@ -0,0 +1,35 @@ +#include "f2c.h" + +#ifdef KR_headers +double sqrt(), f__cabs(); +VOID z_sqrt(r, z) doublecomplex *r, *z; +#else +#undef abs +#include "math.h" +#ifdef __cplusplus +extern "C" { +#endif +extern double f__cabs(double, double); +void z_sqrt(doublecomplex *r, doublecomplex *z) +#endif +{ + double mag, zi = z->i, zr = z->r; + + if( (mag = f__cabs(zr, zi)) == 0.) + r->r = r->i = 0.; + else if(zr > 0) + { + r->r = sqrt(0.5 * (mag + zr) ); + r->i = zi / r->r / 2; + } + else + { + r->i = sqrt(0.5 * (mag - zr) ); + if(zi < 0) + r->i = - r->i; + r->r = zi / r->i / 2; + } + } +#ifdef __cplusplus +} +#endif |