catanh(3M)

DESCRIPTION

These functions are available only for IA-64.

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 [-iPi/2,iPi/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.

USAGE

To use these functions, compile with the default -Ae option. Make sure your program includes <complex.h>. Link in the math library by specifying -lm on the compiler or linker command line.

RETURN VALUES

catanh(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+iPi/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+iPi/2, for finite positive-signed y.

catanh(+Inf+iInf) returns +0+iPi/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+iPi/2 (where the sign of the real part of the result is unspecified).

catanh(NaN+iNaN) returns NaN+iNaN.

ERRORS

No errors are defined.

SEE ALSO

atanh(3M), ctanh(3M), complex(5).

STANDARDS CONFORMANCE

catanh(), catanhf(): ISO/IEC C99 (including Annex G, IEC 60559-compatible complex arithmetic)