cisd.3m (2010 09)

cisd(3M) cisd(3M)

(HP Integrity Server Only)

NAME

cisd(), cisdf(), cisdl(), cisdw(), cisdq() - complex value with unit magnitude and given angle speciﬁed in

degrees

SYNOPSIS

#include <complex.h>

double complex cisd(double x );

float complex cisdf(float x );

long double complex cisdl(long double x );

extended complex cisdw(extended

x );

quad complex cisdq(quad x );

DESCRIPTION

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

tively, where x is speciﬁed in degrees.

cisdf() is a float complex version of cisd()

; it takes a float argument and returns a float

complex result.

cisdl() is a long double complex version of cisd(); it takes a long double argument and

returns a long double complex result.

cisdw() is an extended complex version of cisd(); it takes an extended argument and returns

an extended complex result.

cisdq() is equivalent to cisdl() on HP-UX systems.

USAGE

To use these functions, compile with the default

-Ae option. To use cisdw()

or cisdq(), 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

cisd(-x) = conj(cisd(x)).

cisd(±0) returns 1±i0.

cisd(+Inf) returns NaN+iNaN.

cisd(NaN) returns NaN+iNaN.

ERRORS

No errors are deﬁned.