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| author | Vladimir Azarov <avm@intermediate-node.net> | 2024-10-01 15:47:05 +0200 |
|---|---|---|
| committer | Vladimir Azarov <avm@intermediate-node.net> | 2024-10-01 15:47:05 +0200 |
| commit | 4abab5ad6c8465a7528ccdd5f49367da05f78bbd (patch) | |
| tree | ebf009bf1376a5a223a915bc27cbbd791a1316bc /src/complex/cacos.c | |
Initial version
Diffstat (limited to 'src/complex/cacos.c')
| -rw-r--r-- | src/complex/cacos.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/complex/cacos.c b/src/complex/cacos.c new file mode 100644 index 0000000..c39d257 --- /dev/null +++ b/src/complex/cacos.c @@ -0,0 +1,11 @@ +#include "complex_impl.h" + +// FIXME: Hull et al. "Implementing the complex arcsine and arccosine functions using exception handling" 1997 + +/* acos(z) = pi/2 - asin(z) */ + +double complex cacos(double complex z) +{ + z = casin(z); + return CMPLX(M_PI_2 - creal(z), -cimag(z)); +} |