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Diffstat (limited to 'src/complex/ctanh.c')
| -rw-r--r-- | src/complex/ctanh.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/complex/ctanh.c b/src/complex/ctanh.c index 0461050d..3ba3a899 100644 --- a/src/complex/ctanh.c +++ b/src/complex/ctanh.c @@ -101,11 +101,13 @@ double complex ctanh(double complex z) } /* + * ctanh(+-0 + i NAN) = +-0 + i NaN + * ctanh(+-0 +- i Inf) = +-0 + i NaN * ctanh(x + i NAN) = NaN + i NaN * ctanh(x +- i Inf) = NaN + i NaN */ if (!isfinite(y)) - return CMPLX(y - y, y - y); + return CMPLX(x ? y - y : x, y - y); /* * ctanh(+-huge + i +-y) ~= +-1 +- i 2sin(2y)/exp(2x), using the |