rsqrt(3M)																 rsqrt(3M)

NAME

       rsqrt(),  rsqrtf(),  rsqrtl(), rsqrtw(), rsqrtq(), invsqrt(), invsqrtf(), invsqrtl(), invsqrtw(), invsqrtq() - reciprocal square root func-
       tions

SYNOPSIS

DESCRIPTION

       returns the reciprocal of the non-negative square root of x.

       The expression is intended as a higher performance alternative to The two expressions are comparably accurate, but do not  compute  exactly
       the same value in every case.  For example, can be just slightly greater than 1, in rare cases.

       is equivalent to It is provided in HP-UX to facilitate importing code from other platforms.

       and are versions of and they take a argument and returns a result.

       and are a version of and they take a argument and returns a result.

       and are an version of and they take an argument and returns an result.

       On HP-UX systems, is equivalent to and is equivalent to

USAGE

       To use these functions compile either with the default option or with the and the options.

       To use or compile also with the option.

       To use any of these functions, make sure your program includes and link in the math library by specifying on the compiler or linker command
       line.

RETURN VALUE

       If x and raises the divide-by-zero exception.

       If x is +INFINITY, returns +0.

       If x is NaN, returns NaN.

       If x is less than zero, returns NaN and raises the invalid floating-point exception.

       raises the inexact exception whenever a rounded result does not equal the mathematical result.

ERRORS

       No errors are defined.

SEE ALSO

       sqrt(3M), math(5).

STANDARDS CONFORMANCE

       These functions are not specified by any standard.

							     HP Integrity Server Only							 rsqrt(3M)