<html lang="en"> <head> <title>COS - The GNU Fortran Compiler</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="The GNU Fortran Compiler"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Intrinsic-Procedures.html#Intrinsic-Procedures" title="Intrinsic Procedures"> <link rel="prev" href="CONJG.html#CONJG" title="CONJG"> <link rel="next" href="COSH.html#COSH" title="COSH"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 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Copies published by the Free Software Foundation raise funds for GNU development.--> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="COS"></a> <p> Next: <a rel="next" accesskey="n" href="COSH.html#COSH">COSH</a>, Previous: <a rel="previous" accesskey="p" href="CONJG.html#CONJG">CONJG</a>, Up: <a rel="up" accesskey="u" href="Intrinsic-Procedures.html#Intrinsic-Procedures">Intrinsic Procedures</a> <hr> </div> <h3 class="section">8.52 <code>COS</code> — Cosine function</h3> <p><a name="index-COS-511"></a><a name="index-DCOS-512"></a><a name="index-CCOS-513"></a><a name="index-ZCOS-514"></a><a name="index-CDCOS-515"></a><a name="index-trigonometric-function_002c-cosine-516"></a><a name="index-cosine-517"></a> <dl> <dt><em>Description</em>:<dd><code>COS(X)</code> computes the cosine of <var>X</var>. <br><dt><em>Standard</em>:<dd>Fortran 77 and later, has overloads that are GNU extensions <br><dt><em>Class</em>:<dd>Elemental function <br><dt><em>Syntax</em>:<dd><code>RESULT = COS(X)</code> <br><dt><em>Arguments</em>:<dd> <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>X</var> </td><td valign="top" width="70%">The type shall be <code>REAL</code> or <code>COMPLEX</code>. <br></td></tr></table> <br><dt><em>Return value</em>:<dd>The return value is of the same type and kind as <var>X</var>. The real part of the result is in radians. If <var>X</var> is of the type <code>REAL</code>, the return value lies in the range -1 \leq \cos (x) \leq 1. <br><dt><em>Example</em>:<dd> <pre class="smallexample"> program test_cos real :: x = 0.0 x = cos(x) end program test_cos </pre> <br><dt><em>Specific names</em>:<dd> <p><table summary=""><tr align="left"><td valign="top" width="20%">Name </td><td valign="top" width="20%">Argument </td><td valign="top" width="20%">Return type </td><td valign="top" width="25%">Standard <br></td></tr><tr align="left"><td valign="top" width="20%"><code>COS(X)</code> </td><td valign="top" width="20%"><code>REAL(4) X</code> </td><td valign="top" width="20%"><code>REAL(4)</code> </td><td valign="top" width="25%">Fortran 77 and later <br></td></tr><tr align="left"><td valign="top" width="20%"><code>DCOS(X)</code> </td><td valign="top" width="20%"><code>REAL(8) X</code> </td><td valign="top" width="20%"><code>REAL(8)</code> </td><td valign="top" width="25%">Fortran 77 and later <br></td></tr><tr align="left"><td valign="top" width="20%"><code>CCOS(X)</code> </td><td valign="top" width="20%"><code>COMPLEX(4) X</code> </td><td valign="top" width="20%"><code>COMPLEX(4)</code> </td><td valign="top" width="25%">Fortran 77 and later <br></td></tr><tr align="left"><td valign="top" width="20%"><code>ZCOS(X)</code> </td><td valign="top" width="20%"><code>COMPLEX(8) X</code> </td><td valign="top" width="20%"><code>COMPLEX(8)</code> </td><td valign="top" width="25%">GNU extension <br></td></tr><tr align="left"><td valign="top" width="20%"><code>CDCOS(X)</code> </td><td valign="top" width="20%"><code>COMPLEX(8) X</code> </td><td valign="top" width="20%"><code>COMPLEX(8)</code> </td><td valign="top" width="25%">GNU extension <br></td></tr></table> <br><dt><em>See also</em>:<dd>Inverse function: <a href="ACOS.html#ACOS">ACOS</a> </dl> </body></html>