| atan2.3 (174563) | atan2.3 (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: @(#)atan2.3 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: @(#)atan2.3 5.1 (Berkeley) 5/2/91 |
| 29.\" $FreeBSD: head/lib/msun/man/atan2.3 174563 2007-12-12 23:50:00Z das $ | 29.\" $FreeBSD: head/lib/msun/man/atan2.3 181074 2008-07-31 22:41:26Z das $ |
| 30.\" | 30.\" |
| 31.Dd December 12, 2007 | 31.Dd July 31, 2008 |
| 32.Dt ATAN2 3 33.Os 34.Sh NAME 35.Nm atan2 , 36.Nm atan2f , | 32.Dt ATAN2 3 33.Os 34.Sh NAME 35.Nm atan2 , 36.Nm atan2f , |
| 37.Nm atan2l , |
|
| 37.Nm carg , | 38.Nm carg , |
| 38.Nm cargf | 39.Nm cargf , 40.Nm cargl |
| 39.Nd arc tangent and complex phase angle functions 40.Sh LIBRARY 41.Lb libm 42.Sh SYNOPSIS 43.In math.h 44.Ft double 45.Fn atan2 "double y" "double x" 46.Ft float 47.Fn atan2f "float y" "float x" | 41.Nd arc tangent and complex phase angle functions 42.Sh LIBRARY 43.Lb libm 44.Sh SYNOPSIS 45.In math.h 46.Ft double 47.Fn atan2 "double y" "double x" 48.Ft float 49.Fn atan2f "float y" "float x" |
| 50.Ft long double 51.Fn atan2l "long double y" "long double x" 52.In complex.h |
|
| 48.Ft double 49.Fn carg "double complex z" 50.Ft float 51.Fn cargf "float complex z" | 53.Ft double 54.Fn carg "double complex z" 55.Ft float 56.Fn cargf "float complex z" |
| 57.Ft long double 58.Fn cargl "long double complex z" |
|
| 52.Sh DESCRIPTION 53The | 59.Sh DESCRIPTION 60The |
| 54.Fn atan2 55and the 56.Fn atan2f | 61.Fn atan2 , 62.Fn atan2f , 63and 64.Fn atan2l |
| 57functions compute the principal value of the arc tangent of 58.Fa y/ Ns Ar x , 59using the signs of both arguments to determine the quadrant of 60the return value. 61.ie '\*[.T]'utf8' \{\ 62. ds Th \[*h] 63.\} 64.el \{\ 65. ds Th theta 66.\} 67.Pp 68The | 65functions compute the principal value of the arc tangent of 66.Fa y/ Ns Ar x , 67using the signs of both arguments to determine the quadrant of 68the return value. 69.ie '\*[.T]'utf8' \{\ 70. ds Th \[*h] 71.\} 72.el \{\ 73. ds Th theta 74.\} 75.Pp 76The |
| 69.Fn carg | 77.Fn carg , 78.Fn cargf , |
| 70and | 79and |
| 71.Fn cargf | 80.Fn cargl |
| 72functions compute the complex argument (or phase angle) of 73.Fa z . 74The complex argument is the number \*(Th such that 75.Li z = r * e^(I * \*(Th) , 76where 77.Li r = cabs(z) . 78The call 79.Li carg(z) 80is equivalent to 81.Li atan2(cimag(z), creal(z)) , 82and similarly for | 81functions compute the complex argument (or phase angle) of 82.Fa z . 83The complex argument is the number \*(Th such that 84.Li z = r * e^(I * \*(Th) , 85where 86.Li r = cabs(z) . 87The call 88.Li carg(z) 89is equivalent to 90.Li atan2(cimag(z), creal(z)) , 91and similarly for |
| 83.Fn cargf . | 92.Fn cargf 93and 94.Fn cargl . |
| 84.Sh RETURN VALUES 85The | 95.Sh RETURN VALUES 96The |
| 86.Fn atan2 87and the 88.Fn atan2f | 97.Fn atan2 , 98.Fn atan2f , 99and 100.Fn atan2l |
| 89functions, if successful, 90return the arc tangent of 91.Fa y/ Ns Ar x 92in the range 93.Bk -words 94.Bq \&- Ns \*(Pi , \&+ Ns \*(Pi 95.Ek 96radians. --- 108 unchanged lines hidden (view full) --- 205.Xr sin 3 , 206.Xr sinh 3 , 207.Xr tan 3 , 208.Xr tanh 3 209.Sh STANDARDS 210The 211.Fn atan2 , 212.Fn atan2f , | 101functions, if successful, 102return the arc tangent of 103.Fa y/ Ns Ar x 104in the range 105.Bk -words 106.Bq \&- Ns \*(Pi , \&+ Ns \*(Pi 107.Ek 108radians. --- 108 unchanged lines hidden (view full) --- 217.Xr sin 3 , 218.Xr sinh 3 , 219.Xr tan 3 , 220.Xr tanh 3 221.Sh STANDARDS 222The 223.Fn atan2 , 224.Fn atan2f , |
| 225.Fn atan2l , |
|
| 213.Fn carg , | 226.Fn carg , |
| 227.Fn cargf , |
|
| 214and | 228and |
| 215.Fn cargf | 229.Fn cargl |
| 216functions conform to 217.St -isoC-99 . | 230functions conform to 231.St -isoC-99 . |