HP-UX Reference (11i v3 07/02) - 3 Library Functions A-M (vol 6)

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cis(3M) cis(3M)

(HP Integrity Server Only)

NAME

cis(), cisf(), cisl(), cisw(), cisq() - complex value with unit magnitude and given angle (speciﬁed in radians)

SYNOPSIS

#include <complex.h>

double complex cis(double x);

float complex cisf(float x);

long double complex cisl(long double x);

extended complex cisw(extended x);

quad complex cisq(quad x);

DESCRIPTION

These functions are available only for Integrity servers.

cis() returns the complex value whose real and imaginary parts are the cosine and sine of x, respec-

tively.

cis(x) is equivalent to cexp(ix).

cisf()

is a float complex version of cis(); it takes a float argument and returns a

float

complex

result.

cisl() is a long double complex version of cis(); it takes a long double argument and

returns a

long double complex result.

cisw() is an extended complex version of cis(); it takes an extended argument and returns an

extended complex result.

cisq() is equivalent to cisl() on HP-UX systems.

USAGE

To use these functions, compile with the default -Ae option. To use cisw()

or cisq(), 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 VALUE

cis(-x) = conj(cis( x)).

cis(±0) returns 1±i0.

cis(+Inf) returns NaN+iNaN.

cis(NaN) returns NaN+iNaN.

ERRORS

No errors are deﬁned.