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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gfortran/ATAN2D.html | |
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diff --git a/share/doc/gfortran/ATAN2D.html b/share/doc/gfortran/ATAN2D.html new file mode 100644 index 0000000..52f8bda --- /dev/null +++ b/share/doc/gfortran/ATAN2D.html @@ -0,0 +1,163 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1999-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Funding Free Software", the Front-Cover +Texts being (a) (see below), and with the Back-Cover Texts being (b) +(see below). A copy of the license is included in the section entitled +"GNU Free Documentation License". + +(a) The FSF's Front-Cover Text is: + +A GNU Manual + +(b) The FSF's Back-Cover Text is: + +You have freedom to copy and modify this GNU Manual, like GNU + software. Copies published by the Free Software Foundation raise + funds for GNU development. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>The GNU Fortran Compiler: ATAN2D</title> + +<meta name="description" content="The GNU Fortran Compiler: ATAN2D"> +<meta name="keywords" content="The GNU Fortran Compiler: ATAN2D"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Option-Index.html#Option-Index" rel="index" title="Option Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Intrinsic-Procedures.html#Intrinsic-Procedures" rel="up" title="Intrinsic Procedures"> +<link href="ATANH.html#ATANH" rel="next" title="ATANH"> +<link href="ATAN2.html#ATAN2" rel="previous" title="ATAN2"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="ATAN2D"></a> +<div class="header"> +<p> +Next: <a href="ATANH.html#ATANH" accesskey="n" rel="next">ATANH</a>, Previous: <a href="ATAN2.html#ATAN2" accesskey="p" rel="previous">ATAN2</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="ATAN2D-_002d_002d_002d-Arctangent-function_002c-degrees"></a> +<h3 class="section">8.26 <code>ATAN2D</code> — Arctangent function, degrees</h3> +<a name="index-ATAN2D"></a> +<a name="index-DATAN2D"></a> +<a name="index-trigonometric-function_002c-tangent_002c-inverse_002c-degrees-1"></a> +<a name="index-tangent_002c-inverse_002c-degrees-1"></a> + +<dl compact="compact"> +<dt><em>Description</em>:</dt> +<dd><p><code>ATAN2D(Y, X)</code> computes the principal value of the argument +function of the complex number <em>X + i Y</em> in degrees. This function can +be used to transform from Cartesian into polar coordinates and +allows to determine the angle in the correct quadrant. +</p> +<p>This function is for compatibility only and should be avoided in favor of +standard constructs wherever possible. +</p> +</dd> +<dt><em>Standard</em>:</dt> +<dd><p>GNU extension, enabled with <samp>-fdec-math</samp>. +</p> +</dd> +<dt><em>Class</em>:</dt> +<dd><p>Elemental function +</p> +</dd> +<dt><em>Syntax</em>:</dt> +<dd><p><code>RESULT = ATAN2D(Y, X)</code> +</p> +</dd> +<dt><em>Arguments</em>:</dt> +<dd><table> +<tr><td width="15%"><var>Y</var></td><td width="70%">The type shall be <code>REAL</code>.</td></tr> +<tr><td width="15%"><var>X</var></td><td width="70%">The type and kind type parameter shall be the same as <var>Y</var>. +If <var>Y</var> is zero, then <var>X</var> must be nonzero.</td></tr> +</table> + +</dd> +<dt><em>Return value</em>:</dt> +<dd><p>The return value has the same type and kind type parameter as <var>Y</var>. It +is the principal value of the complex number <em>X + i Y</em>. If <var>X</var> +is nonzero, then it lies in the range <em>-180 \le \atan (x) \leq 180</em>. +The sign is positive if <var>Y</var> is positive. If <var>Y</var> is zero, then +the return value is zero if <var>X</var> is strictly positive, <em>180</em> if +<var>X</var> is negative and <var>Y</var> is positive zero (or the processor does +not handle signed zeros), and <em>-180</em> if <var>X</var> is negative and +<var>Y</var> is negative zero. Finally, if <var>X</var> is zero, then the +magnitude of the result is <em>90</em>. +</p> +</dd> +<dt><em>Example</em>:</dt> +<dd><div class="smallexample"> +<pre class="smallexample">program test_atan2d + real(4) :: x = 1.e0_4, y = 0.5e0_4 + x = atan2d(y,x) +end program test_atan2d +</pre></div> + +</dd> +<dt><em>Specific names</em>:</dt> +<dd><table> +<thead><tr><th width="23%">Name</th><th width="23%">Argument</th><th width="20%">Return type</th><th width="30%">Standard</th></tr></thead> +<tr><td width="23%"><code>ATAN2D(X, Y)</code></td><td width="23%"><code>REAL(4) X, Y</code></td><td width="20%"><code>REAL(4)</code></td><td width="30%">GNU extension</td></tr> +<tr><td width="23%"><code>DATAN2D(X, Y)</code></td><td width="23%"><code>REAL(8) X, Y</code></td><td width="20%"><code>REAL(8)</code></td><td width="30%">GNU extension</td></tr> +</table> + +</dd> +<dt><em>See also</em>:</dt> +<dd><p>Alias: <br> +<a href="ATAND.html#ATAND">ATAND</a> <br> +Radians function: <br> +<a href="ATAN2.html#ATAN2">ATAN2</a> +</p></dd> +</dl> + + + +<hr> +<div class="header"> +<p> +Next: <a href="ATANH.html#ATANH" accesskey="n" rel="next">ATANH</a>, Previous: <a href="ATAN2.html#ATAN2" accesskey="p" rel="previous">ATAN2</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |