| atan.3 (165906) | atan.3 (181074) |
|---|---|
| 1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 12 unchanged lines hidden (view full) --- 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" from: @(#)atan.3 5.1 (Berkeley) 5/2/91 | 1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 12 unchanged lines hidden (view full) --- 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" from: @(#)atan.3 5.1 (Berkeley) 5/2/91 |
| 29.\" $FreeBSD: head/lib/msun/man/atan.3 165906 2007-01-09 01:02:06Z imp $ | 29.\" $FreeBSD: head/lib/msun/man/atan.3 181074 2008-07-31 22:41:26Z das $ |
| 30.\" | 30.\" |
| 31.Dd May 2, 1991 | 31.Dd July 31, 2008 |
| 32.Dt ATAN 3 33.Os 34.Sh NAME 35.Nm atan , | 32.Dt ATAN 3 33.Os 34.Sh NAME 35.Nm atan , |
| 36.Nm atanf | 36.Nm atanf , 37.Nm atanl |
| 37.Nd arc tangent functions of one variable 38.Sh LIBRARY 39.Lb libm 40.Sh SYNOPSIS 41.In math.h 42.Ft double 43.Fn atan "double x" 44.Ft float 45.Fn atanf "float x" | 38.Nd arc tangent functions of one variable 39.Sh LIBRARY 40.Lb libm 41.Sh SYNOPSIS 42.In math.h 43.Ft double 44.Fn atan "double x" 45.Ft float 46.Fn atanf "float x" |
| 47.Ft long double 48.Fn atanl "long double x" |
|
| 46.Sh DESCRIPTION 47The | 49.Sh DESCRIPTION 50The |
| 48.Fn atan 49and the 50.Fn atanf | 51.Fn atan , 52.Fn atanf , 53and 54.Fn atanl |
| 51functions compute the principal value of the arc tangent of 52.Fa x . | 55functions compute the principal value of the arc tangent of 56.Fa x . |
| 53For a discussion of error due to roundoff, see 54.Xr math 3 . | |
| 55.Sh RETURN VALUES | 57.Sh RETURN VALUES |
| 56The 57.Fn atan 58and the 59.Fn atanf 60function returns the arc tangent in the range | 58These functions return the arc tangent in the range |
| 61.Bk -words 62.Bq -\*(Pi/2 , +\*(Pi/2 63.Ek 64radians. 65.Sh SEE ALSO 66.Xr acos 3 , 67.Xr asin 3 , 68.Xr atan2 3 , 69.Xr cos 3 , 70.Xr cosh 3 , 71.Xr math 3 , 72.Xr sin 3 , 73.Xr sinh 3 , 74.Xr tan 3 , 75.Xr tanh 3 76.Sh STANDARDS 77The | 59.Bk -words 60.Bq -\*(Pi/2 , +\*(Pi/2 61.Ek 62radians. 63.Sh SEE ALSO 64.Xr acos 3 , 65.Xr asin 3 , 66.Xr atan2 3 , 67.Xr cos 3 , 68.Xr cosh 3 , 69.Xr math 3 , 70.Xr sin 3 , 71.Xr sinh 3 , 72.Xr tan 3 , 73.Xr tanh 3 74.Sh STANDARDS 75The |
| 78.Fn atan 79function conforms to 80.St -isoC . | 76.Fn atan , 77.Fn atanf , 78and 79.Fn atanl 80functions conform to 81.St -isoC-99 . |