_csin_sub 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 csinh_sub ctan_sub ctanh_sub

cexpm1() doublecomplex cexpm1 ( doublecomplex  z ) exp(z) - 1 of complex number Purpose cexpm1 evaluates exp(z) - 1 accurately in the sense of relative error when z is very small. Returns exp(z) - 1. Parameters [in] z Complex argument z. Error handling Range error (ERANGE) may occur.