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

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cproj(3M) cproj(3M)

(HP Integrity Server Only)

NAME

cproj( ), cprojf(), cprojl( ), cprojw( ), cprojq() - functions that project all inﬁnities onto the one on the positive

real axis

SYNOPSIS

#include <complex.h>

double complex cproj(double complex z);

float complex cprojf(float complex z);

long double complex cprojl(long double complex z);

extended complex cprojw(extended complex z);

quad complex cprojq(quad complex z);

DESCRIPTION

These functions are available only for Integrity servers.

cproj() returns its argument z, except if the argument is a complex inﬁnity (even if it is a complex

inﬁnity which has one inﬁnite part and one NaN part), then cproj() returns a positive inﬁnity on the

real axis, with imaginary part

copysign(0.0,cimag(

z )). It is intended as an aide for modeling the

Riemann sphere.

cprojf() is a float complex version of cproj(); it takes a float complex argument and

returns a

float complex result.

cprojl() is a long double complex version of cproj(); it takes a long double complex

argument and returns a long double complex result.

cprojw() is an extended complex version of cproj(); it takes an extended complex argu-

ment and returns an

extended complex result.

cprojq() is equivalent to cprojl() on HP-UX systems.

These functions raise no exceptions.

USAGE

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

cprojq(), 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.

ERRORS

No errors are deﬁned.