<html lang="en"> <head> <title>SRAND - 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="SQRT.html#SQRT" title="SQRT"> <link rel="next" href="STAT.html#STAT" title="STAT"> <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. 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.--> <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="SRAND"></a> <p> Next: <a rel="next" accesskey="n" href="STAT.html#STAT">STAT</a>, Previous: <a rel="previous" accesskey="p" href="SQRT.html#SQRT">SQRT</a>, Up: <a rel="up" accesskey="u" href="Intrinsic-Procedures.html#Intrinsic-Procedures">Intrinsic Procedures</a> <hr> </div> <h3 class="section">8.229 <code>SRAND</code> — Reinitialize the random number generator</h3> <p><a name="index-SRAND-1037"></a><a name="index-random-number-generation_002c-seeding-1038"></a><a name="index-seeding-a-random-number-generator-1039"></a> <dl> <dt><em>Description</em>:<dd><code>SRAND</code> reinitializes the pseudo-random number generator called by <code>RAND</code> and <code>IRAND</code>. The new seed used by the generator is specified by the required argument <var>SEED</var>. <br><dt><em>Standard</em>:<dd>GNU extension <br><dt><em>Class</em>:<dd>Subroutine <br><dt><em>Syntax</em>:<dd><code>CALL SRAND(SEED)</code> <br><dt><em>Arguments</em>:<dd> <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>SEED</var> </td><td valign="top" width="70%">Shall be a scalar <code>INTEGER(kind=4)</code>. <br></td></tr></table> <br><dt><em>Return value</em>:<dd>Does not return anything. <br><dt><em>Example</em>:<dd>See <code>RAND</code> and <code>IRAND</code> for examples. <br><dt><em>Notes</em>:<dd>The Fortran 2003 standard specifies the intrinsic <code>RANDOM_SEED</code> to initialize the pseudo-random numbers generator and <code>RANDOM_NUMBER</code> to generate pseudo-random numbers. Please note that in GNU Fortran, these two sets of intrinsics (<code>RAND</code>, <code>IRAND</code> and <code>SRAND</code> on the one hand, <code>RANDOM_NUMBER</code> and <code>RANDOM_SEED</code> on the other hand) access two independent pseudo-random number generators. <br><dt><em>See also</em>:<dd><a href="RAND.html#RAND">RAND</a>, <a href="RANDOM_005fSEED.html#RANDOM_005fSEED">RANDOM_SEED</a>, <a href="RANDOM_005fNUMBER.html#RANDOM_005fNUMBER">RANDOM_NUMBER</a> </dl> </body></html>