74 lines
4.9 KiB
XML
74 lines
4.9 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<helpdocument version="1.0">
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<!--
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* This file is part of the LibreOffice project.
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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-->
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<meta>
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<topic id="textsbasicshared03080301xml" indexer="include" status="PUBLISH">
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<title id="tit" xml-lang="en-US">Randomize Statement</title>
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<filename>/text/sbasic/shared/03080301.xhp</filename>
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</topic>
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</meta>
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<body>
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<section id="randomize">
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<bookmark xml-lang="en-US" branch="index" id="bm_id3150616">
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<bookmark_value>Randomize statement</bookmark_value>
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</bookmark>
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<h1 id="hd_id3150616"><variable id="heading_randomize"><link href="text/sbasic/shared/03080301.xhp">Randomize Statement</link></variable></h1>
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<paragraph id="par_id3145090" role="paragraph" xml-lang="en-US">Initializes the random-number generator used by the <emph>Rnd</emph> function.</paragraph>
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</section>
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<h2 id="hd_id3147573">Syntax:</h2>
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<bascode>
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<paragraph id="par_id3145315" role="bascode" xml-lang="en-US">Randomize [Number]</paragraph>
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</bascode>
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<h2 id="hd_id3152456">Parameters:</h2>
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<paragraph id="par_id3149670" role="paragraph" xml-lang="en-US"> <emph>Number:</emph> Any integer value. Used as seed to initialize the random-number generator. Equal seeds result in equal random-number sequences by the <emph>Rnd</emph> function. If the parameter is omitted, the <emph>Randomize</emph> statement will be ignored.</paragraph>
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<paragraph id="par_id110520161656428611" role="note" xml-lang="en-US">Unless a predictable sequence of numbers is desired, there is no need to use the <emph>Randomize</emph> statement, as the random-number generator will be initialized automatically at first use – it will be seeded using a system-provided random-number generator that produces uniformly-distributed, non-deterministic random numbers. If no such generator is available on the system, the system time will be used as seed.</paragraph>
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<paragraph id="par_id12052016194258344" role="paragraph" xml-lang="en-US">The <emph>Randomize</emph> statement affects BASIC's <emph>Rnd</emph> function only. Other random-number generators (for example the Calc's RAND() function, etc.) are not affected by it.</paragraph>
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<embed href="text/sbasic/shared/00000003.xhp#errorcode"/>
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<embed href="text/sbasic/shared/00000003.xhp#err5"/>
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<h2 id="hd_id3149655">Example:</h2>
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<bascode>
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<paragraph id="par_idm1340800064" role="bascode" localize="false" xml-lang="en-US">Sub ExampleRandomize</paragraph>
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<paragraph id="par_idm1340798832" role="bascode" localize="false" xml-lang="en-US">Dim iCount As Integer, iVar As Integer, sText As String</paragraph>
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<paragraph id="par_idm1340797584" role="bascode" localize="false" xml-lang="en-US">Dim iSpectral(10) As Integer</paragraph>
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<paragraph id="par_idm1340796336" role="bascode" localize="false" xml-lang="en-US"> Randomize 2^14-1</paragraph>
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<paragraph id="par_idm1340795104" role="bascode" localize="false" xml-lang="en-US"> For iCount = 1 To 1000</paragraph>
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<paragraph id="par_id3147288" role="bascode" xml-lang="en-US"> iVar = Int(10 * Rnd) ' Range from 0 to 9</paragraph>
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<paragraph id="par_idm1340792112" role="bascode" localize="false" xml-lang="en-US"> iSpectral(iVar) = iSpectral(iVar) +1</paragraph>
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<paragraph id="par_idm1340790848" role="bascode" localize="false" xml-lang="en-US"> Next iCount</paragraph>
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<paragraph id="par_idm1341621328" role="bascode" localize="false" xml-lang="en-US"> sText = " | "</paragraph>
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<paragraph id="par_idm1341620096" role="bascode" localize="false" xml-lang="en-US"> For iCount = 0 To 9</paragraph>
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<paragraph id="par_idm1341618864" role="bascode" localize="false" xml-lang="en-US"> sText = sText & iSpectral(iCount) & " | "</paragraph>
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<paragraph id="par_idm1341617536" role="bascode" localize="false" xml-lang="en-US"> Next iCount</paragraph>
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<paragraph id="par_id3148617" role="bascode" xml-lang="en-US"> MsgBox sText,0,"Spectral Distribution"</paragraph>
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<paragraph id="par_idm1341614560" role="bascode" localize="false" xml-lang="en-US">End Sub</paragraph>
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</bascode>
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<section id="relatedtopics">
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<paragraph id="par_id110520162207025898" role="paragraph" localize="false" xml-lang="en-US"><embedvar href="text/sbasic/shared/03080302.xhp#heading_rnd"/></paragraph>
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</section>
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</body>
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</helpdocument>
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