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HP-UX Reference > Ccatanh(3M)HP Integrity Server OnlyHP-UX 11i Version 3: February 2007 |
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NAMEcatanh(), catanhf(), catanhl(), catanhw(), catanhq() — complex arc hyperbolic tangent functions SYNOPSIS#include <complex.h> double complex catanh(double complex z); float complex catanhf(float complex z); long double complex catanhl(long double complex z); extended complex catanhw(extended complex z); quad complex catanhq(quad complex z); DESCRIPTIONThese functions are available only for Integrity servers. catanh() returns the complex arc hyperbolic tangent of z, in the range of a strip mathematically unbounded along the real axis and in the interval [-iπ/2,iπ/2] along the imaginary axis. Branch cuts are outside the interval [-1,+1] along the real axis. catanhf() is a float complex version of catanh(); it takes a float complex argument and returns a float complex result. catanhl() is a long double complex version of catanh(); it takes a long double complex argument and returns a long double complex result. catanhw() is an extended complex version of catanh(); it takes an extended complex argument and returns an extended complex result. catanhq() is equivalent to catanhl() on HP-UX systems. USAGETo use these functions, compile with the default -Ae option. To use catanhw() or catanhq(), compile with the -fpwidetypes option. Make sure your program includes <complex.h>. Link in the math library by specifying -lm on the compiler or linker command line. RETURN VALUEcatanh(conj(z)) = conj(catanh(z)) and catanh is odd. catanh(+0+i0) returns +0+i0. catanh(+0+iNaN) returns +0+iNaN. catanh(+1+i0) returns +Inf+i0 and raises the divide-by-zero floating-point exception. catanh(x+iInf) returns +0+iπ/2, for finite positive-signed x. catanh(x+iNaN) returns NaN+iNaN and optionally raises the invalid floating-point exception, for nonzero finite x. catanh(+Inf+iy) returns +0+iπ/2, for finite positive-signed y. catanh(+Inf+iInf) returns +0+iπ/2. catanh(+Inf+iNaN) returns +0+iNaN. catanh(NaN+iy) returns NaN+iNaN and optionally raises the invalid floating-point exception, for finite y. catanh(NaN+iInf) returns ±0+iπ/2 (where the sign of the real part of the result is unspecified). catanh(NaN+iNaN) returns NaN+iNaN. |
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