csqrt(3m) [sunos man page]

csqrt(3M)						  Mathematical Library Functions						 csqrt(3M)

NAME

       csqrt, csqrtf, csqrtl - complex square root functions

SYNOPSIS

       cc [ flag... ] file... -lm [ library... ]
       #include <complex.h>

       double complex csqrt(double complex z);

       float complex csqrtf(float complex z);

       long double complex csqrtl(long double complex z);

DESCRIPTION

       These functions compute the complex square root of z, with a branch cut along the negative real axis.

RETURN VALUES

       These functions return the complex square root value, in the range of the right half-plane (including the imaginary axis).

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cabs(3M), complex.h(3HEAD), cpow(3M), attributes(5), standards(5)

SunOS 5.10							    1 Sep 2002								 csqrt(3M)

CSQRT(3)						   BSD Library Functions Manual 						  CSQRT(3)

NAME

     csqrt, csqrtf, csqrtl -- complex square root functions

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <complex.h>

     double complex
     csqrt(double complex z);

     float complex
     csqrtf(float complex z);

     long double complex
     csqrtl(long double complex z);

DESCRIPTION

     The csqrt(), csqrtf(), and csqrtl() functions compute the square root of z in the complex plane, with a branch cut along the negative real
     axis.  In other words, csqrt(), csqrtf(), and csqrtl() always return the square root whose real part is non-negative.

RETURN VALUES

     These functions return the requested square root.	The square root of 0 is +0 +- 0, where the imaginary parts of the input and respective
     result have the same sign.  For infinities and NaNs, the following rules apply, with the earlier rules having precedence:

	   Input		Result
	   k + infinity*I	infinity + infinity*I	    (for all k)
	   -infinity + NaN*I	NaN +- infinity*I
	   infinity + NaN*I	infinity + NaN*I
	   k + NaN*I		NaN + NaN*I
	   NaN + k*I		NaN + NaN*I
	   -infinity + k*I	+0 + infinity*I
	   infinity + k*I	infinity + 0*I

     For numbers with negative imaginary parts, the above special cases apply given the identity:
	   csqrt(conj(z) = conj(sqrt(z))
     Note that the sign of NaN is indeterminate.  Also, if the real or imaginary part of the input is finite and an NaN is generated, an invalid
     exception will be thrown.

SEE ALSO

     cabs(3), fenv(3), math(3)

STANDARDS

     The csqrt(), csqrtf(), and csqrtl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').

BUGS

     For csqrt() and csqrtl(), inexact results are not always correctly rounded.

BSD
								  March 30, 2008							       BSD