48 lines
3.3 KiB
Text
48 lines
3.3 KiB
Text
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<?xml version="1.0" encoding="UTF-8"?>
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<helpdocument version="1.0">
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<!--
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***********************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2009 by Sun Microsystems, Inc.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************
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-->
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<meta>
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<topic id="nlpsolverusage" indexer="include">
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<title xml-lang="en-US" id="tit">Usage</title>
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<filename>/com.sun.star.comp.Calc.NLPSolver/Usage.xhp</filename>
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</topic>
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</meta>
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<body>
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<bookmark xml-lang="en-US" branch="index" id="bm_id0603200910434044_scalc"><bookmark_value>Solver for Nonlinear Problems;Usage</bookmark_value>
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</bookmark>
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<paragraph xml-lang="en-US" id="hd_id0603200910430882" role="heading" level="1" l10n="NEW">Usage</paragraph>
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<paragraph xml-lang="en-US" id="par_id0603200910430845" role="paragraph" l10n="NEW">Regardless whether you use DEPS or SCO, you start by going to Tools → Solver and set the Cell to be optimized, the direction to go (minimization, maximization) and the cells to be modified to reach the goal. Then you go to the Options and specify the solver to be used and if necessary adjust the according <link href="com.sun.star.comp.Calc.NLPSolver/Options.xhp">parameters</link>.</paragraph>
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<paragraph xml-lang="en-US" id="par_id0603200910430821" role="paragraph" l10n="NEW">There is also a list of constraints you can use to restrict the possible range of solutions or to penalize certain conditions. However, in case of the evolutionary solvers DEPS and SCO, these constraints are also used to specify bounds on the variables of the problem. Due to the random nature of the algorithms, it is <emph>highly recommended</emph> to do so and give upper (and in case "Assume Non-Negative Variables" is turned off also lower) bounds for all variables. They don't have to be near the actual solution (which is probably unknown) but should give a rough indication of the expected size (0 ≤ var ≤ 1 or maybe -1000000 ≤ var ≤ 1000000).</paragraph>
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<paragraph xml-lang="en-US" id="par_id0603200910430873" role="paragraph" l10n="NEW">Bounds are specified by selecting one or more variables (as range) on the left side and entering a numerical value (not a cell or a formula) on the right side. That way you can also choose one or more variables to be <emph>Integer</emph> or <emph>Binary</emph> only.</paragraph>
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</body>
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</helpdocument>
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