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Annotation of 43BSDReno/lib/libm/common_source/sqrt.3, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1985 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)sqrt.3      6.2 (Berkeley) 5/12/86
                      6: .\"
                      7: .TH SQRT 3M  "May 12, 1986"
                      8: .UC 6
                      9: .ds up \fIulp\fR
                     10: .SH NAME
                     11: cbrt, sqrt \- cube root, square root
                     12: .SH SYNOPSIS
                     13: .nf
                     14: .B #include <math.h>
                     15: .PP
                     16: .B double cbrt(x)
                     17: .B double x;
                     18: .PP
                     19: .B double sqrt(x)
                     20: .B double x;
                     21: .fi
                     22: .SH DESCRIPTION
                     23: Cbrt(x) returns the cube root of x.
                     24: .PP
                     25: Sqrt(x) returns the square root of x.
                     26: .SH DIAGNOSTICS
                     27: On a VAX, sqrt(negative)
                     28: returns the reserved operand and sets \fIerrno\fR to EDOM .
                     29: .SH ERROR (due to Roundoff etc.)
                     30: Cbrt is accurate to within 0.7 \*(ups.
                     31: .br
                     32: Sqrt on a VAX is accurate to within 0.501 \*(ups.
                     33: .br
                     34: Sqrt on a machine that conforms to IEEE 754 is correctly rounded
                     35: in accordance with the rounding mode in force; the error is less than
                     36: half an \*(up in the default mode (round\-to\-nearest).
                     37: An \*(up is one \fIU\fRnit in the \fIL\fRast \fIP\fRlace carried.
                     38: .SH SEE ALSO
                     39: math(3M), infnan(3M)
                     40: .SH AUTHOR
                     41: W. Kahan

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