_cacos_sub _cacosh_sub _casin_sub _casinh_sub _catan_sub _catanh_sub _ccos_sub _ccosh_sub _ccot _ccot_sub _cexp_sub _cexpm1 _cexpm1_sub _clog1p _clog1p_sub _clog_sub _csin_sub _csinh_sub _ctan_sub _ctanh_sub

_clog1p() double _Complex _clog1p ( double _Complex  z ) Evaluate ln(1+z) accurate in the sense of relative error Purpose clog1p evaluates ln(1 + z) accurately in the sense of relative error when z is very small. Returns ln(1 + z). Parameters [in] z Complex argument z. (z != -1) Error handling If z = -1, domain error (EDOM) occurs. If z is too near -1, range error (EDOM) occurs but calculation is continued (precision warning). Other range error (ERANGE) may occur.