diff options
author | bde <bde@FreeBSD.org> | 2002-03-21 00:42:48 +0000 |
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committer | bde <bde@FreeBSD.org> | 2002-03-21 00:42:48 +0000 |
commit | be2cf84b24905468b296d0b27d7c0459acd4dec8 (patch) | |
tree | 57bd79659e7f6862429527509385c95663b5c33b /lib/libm/common_source/atan.c | |
parent | e1ec4d77dcf9547ad4c02a371fcae1d9f176c338 (diff) | |
download | FreeBSD-src-be2cf84b24905468b296d0b27d7c0459acd4dec8.zip FreeBSD-src-be2cf84b24905468b296d0b27d7c0459acd4dec8.tar.gz |
Removed all files in libm except README-FREEBSD and files needed to
implement tgamma().
Diffstat (limited to 'lib/libm/common_source/atan.c')
-rw-r--r-- | lib/libm/common_source/atan.c | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/lib/libm/common_source/atan.c b/lib/libm/common_source/atan.c deleted file mode 100644 index 7565c71..0000000 --- a/lib/libm/common_source/atan.c +++ /dev/null @@ -1,90 +0,0 @@ -/* - * Copyright (c) 1985, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#ifndef lint -static char sccsid[] = "@(#)atan.c 8.1 (Berkeley) 6/4/93"; -#endif /* not lint */ - -/* ATAN(X) - * RETURNS ARC TANGENT OF X - * DOUBLE PRECISION (IEEE DOUBLE 53 bits, VAX D FORMAT 56 bits) - * CODED IN C BY K.C. NG, 4/16/85, REVISED ON 6/10/85. - * - * Required kernel function: - * atan2(y,x) - * - * Method: - * atan(x) = atan2(x,1.0). - * - * Special case: - * if x is NaN, return x itself. - * - * Accuracy: - * 1) If atan2() uses machine PI, then - * - * atan(x) returns (PI/pi) * (the exact arc tangent of x) nearly rounded; - * and PI is the exact pi rounded to machine precision (see atan2 for - * details): - * - * in decimal: - * pi = 3.141592653589793 23846264338327 ..... - * 53 bits PI = 3.141592653589793 115997963 ..... , - * 56 bits PI = 3.141592653589793 227020265 ..... , - * - * in hexadecimal: - * pi = 3.243F6A8885A308D313198A2E.... - * 53 bits PI = 3.243F6A8885A30 = 2 * 1.921FB54442D18 error=.276ulps - * 56 bits PI = 3.243F6A8885A308 = 4 * .C90FDAA22168C2 error=.206ulps - * - * In a test run with more than 200,000 random arguments on a VAX, the - * maximum observed error in ulps (units in the last place) was - * 0.86 ulps. (comparing against (PI/pi)*(exact atan(x))). - * - * 2) If atan2() uses true pi, then - * - * atan(x) returns the exact atan(x) with error below about 2 ulps. - * - * In a test run with more than 1,024,000 random arguments on a VAX, the - * maximum observed error in ulps (units in the last place) was - * 0.85 ulps. - */ - -double atan(x) -double x; -{ - double atan2(),one=1.0; - return(atan2(x,one)); -} |