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<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) XXXX-2008 - INRIA
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
*
-->
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" version="5.0-subset Scilab" xml:lang="en" xml:id="readmps">
<info>
<pubdate>$LastChangedDate$</pubdate>
</info>
<refnamediv>
<refname>readmps</refname>
<refpurpose> reads a file in MPS format</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>mps= readmps (file-name,bounds [,maxsizes]);</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term>file-name</term>
<listitem>
<para>
a string, the name of the mps file
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>bounds</term>
<listitem>
<para>
2-vector
<literal>[lowbound,upbound]</literal> , default lower and upper bounds
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>maxsizes</term>
<listitem>
<para>
3-vector <literal>[maxm,maxn,maxnza]</literal>
Maximum number of contraints and variables, maximum number of
nonzeros entries in the LP constraint matrix. If omitted readmps
reads the file once just to compute these numbers.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>mps</term>
<listitem>
<para>tlist with following fields</para>
<variablelist>
<varlistentry>
<term>irobj</term>
<listitem>
<para>integer (index of the objective row).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>namec</term>
<listitem>
<para>character string (Name of the objective).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>nameb</term>
<listitem>
<para>character string (Name of the right hand side).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>namran</term>
<listitem>
<para>character string (Name of the ranges section).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>nambnd</term>
<listitem>
<para>character string (Name of the bounds section).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>name</term>
<listitem>
<para>character string (Name of the LP problem).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>rownames</term>
<listitem>
<para>
character string column vector (Name of the rows).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>colnames</term>
<listitem>
<para>
character string row vector (Name of the columns).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>rowstat</term>
<listitem>
<para>integer vector, row types:</para>
<variablelist>
<varlistentry>
<term>1</term>
<listitem>
<para>row type is "="</para>
</listitem>
</varlistentry>
<varlistentry>
<term>2</term>
<listitem>
<para> row type is ">="</para>
</listitem>
</varlistentry>
<varlistentry>
<term>3</term>
<listitem>
<para> row type is "<="</para>
</listitem>
</varlistentry>
<varlistentry>
<term>4</term>
<listitem>
<para> objective row</para>
</listitem>
</varlistentry>
<varlistentry>
<term>5</term>
<listitem>
<para> other free row</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
<varlistentry>
<term>rowcode</term>
<listitem>
<para>
real matrix <literal>[hdrowcd,lnkrow]</literal> with
</para>
<variablelist>
<varlistentry>
<term>hdrowcd</term>
<listitem>
<para>real vector (Header to the linked list of rows with the same codes).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>lnkrow</term>
<listitem>
<para>integer vector (Linked list of rows with the same codes).</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
<varlistentry>
<term>colcode</term>
<listitem>
<para>
real matrix <literal>[hdcolcd,lnkcol]</literal> with
</para>
<variablelist>
<varlistentry>
<term>hdcolcd</term>
<listitem>
<para>integer vector (Header to the linked list of columns with the same codes).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>lnkcol</term>
<listitem>
<para>integer vector (Linked list of columns with the same codes).</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
<varlistentry>
<term>rownmbs</term>
<listitem>
<para>integer vector (Row numbers of nonzeros in columns of matrix A.)</para>
</listitem>
</varlistentry>
<varlistentry>
<term>colpnts</term>
<listitem>
<para>integer vector (Pointers to the beginning of columns of matrix A).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>acoeff</term>
<listitem>
<para>real vector (Array of nonzero elements for each column).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>rhs</term>
<listitem>
<para>real vector ( Right hand side of the linear program).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>ranges</term>
<listitem>
<para>real vector of constraint ranges.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>bounds</term>
<listitem>
<para>
real matrix <literal>[lbounds,ubounds]</literal> with
</para>
<variablelist>
<varlistentry>
<term>ubounds</term>
<listitem>
<para>full column vector of upper bounds</para>
</listitem>
</varlistentry>
<varlistentry>
<term>lbounds</term>
<listitem>
<para>full column vector of lower bounds</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
<varlistentry>
<term>stavar</term>
<listitem>
<para>full column vector of variable status</para>
<variablelist>
<varlistentry>
<term>0</term>
<listitem>
<para>standard (non negative) variable</para>
</listitem>
</varlistentry>
<varlistentry>
<term>1</term>
<listitem>
<para>upper bounded variable</para>
</listitem>
</varlistentry>
<varlistentry>
<term>2</term>
<listitem>
<para>lower bounded variable</para>
</listitem>
</varlistentry>
<varlistentry>
<term>3</term>
<listitem>
<para>lower and upper bounded variable</para>
</listitem>
</varlistentry>
<varlistentry>
<term>4</term>
<listitem>
<para>minus infinity type variable i.e -inf<x<=u</para>
</listitem>
</varlistentry>
<varlistentry>
<term>5</term>
<listitem>
<para>plus infinity type variable i.e l<=x< inf</para>
</listitem>
</varlistentry>
<varlistentry>
<term>6</term>
<listitem>
<para>fixed type variable i.e l=x=u</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-k</term>
<listitem>
<para>free variable</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
Reads a file containing description of an LP problem
given in MPS format and returns a <literal>tlist</literal>
which describes the problem. It is an
interface with the program <literal>rdmps1.f</literal> of hopdm (J. Gondzio).
For a description of the variables, see the file rdmps1.f.
</para>
<para>
MPS format is a standard ASCII medium for LP codes.
MPS format is described in more detail in Murtagh's book:
</para>
<para>
Murtagh B. (1981). Advanced Linear Programming, McGrew-Hill,
New York, 1981.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example">
<![CDATA[
//Let the LP problem:
//objective:
// min XONE + 4 YTWO + 9 ZTHREE
//constraints:
// LIM1: XONE + YTWO < = 5
// LIM2: XONE + ZTHREE > = 10
// MYEQN: - YTWO + ZTHREE = 7
//Bounds
// 0 < = XONE < = 4
// -1 < = YTWO < = 1
//Generate MPS file
txt=['NAME TESTPROB'
'ROWS'
' N COST'
' L LIM1'
' G LIM2'
' E MYEQN'
'COLUMNS'
' XONE COST 1 LIM1 1'
' XONE LIM2 1'
' YTWO COST 4 LIM1 1'
' YTWO MYEQN -1'
' ZTHREE COST 9 LIM2 1'
' ZTHREE MYEQN 1'
'RHS'
' RHS1 LIM1 5 LIM2 10'
' RHS1 MYEQN 7'
'BOUNDS'
' UP BND1 XONE 4'
' LO BND1 YTWO -1'
' UP BND1 YTWO 1'
'ENDATA'];
mputl(txt,TMPDIR+'/test.mps')
//Read the MPS file
P=readmps(TMPDIR+'/test.mps',[0 10^30])
disp(P)
]]>
</programlisting>
</refsection>
</refentry>
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