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<h1>testlib.c</h1><a href="testlib_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* main.c</span>
<a name="l00002"></a>00002 <span class="comment"> COPYRIGHT</span>
<a name="l00003"></a>00003 <span class="comment"> Both this software and its documentation are</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> Copyright 1993 by IRISA /Universite de Rennes I - France,</span>
<a name="l00006"></a>00006 <span class="comment"> Copyright 1995,1996 by BYU</span>
<a name="l00007"></a>00007 <span class="comment"> all rights reserved.</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment"> Permission is granted to copy, use, and distribute</span>
<a name="l00010"></a>00010 <span class="comment"> for any commercial or noncommercial purpose under the terms</span>
<a name="l00011"></a>00011 <span class="comment"> of the GNU General Public license, version 2, June 1991</span>
<a name="l00012"></a>00012 <span class="comment"> (see file : LICENSING).</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment"> This file along with polyhedron.c and vector.c do the following functions:</span>
<a name="l00015"></a>00015 <span class="comment"> - Extraction of a minimal set of constraints from some set of constraints</span>
<a name="l00016"></a>00016 <span class="comment"> - Intersection of two convexes</span>
<a name="l00017"></a>00017 <span class="comment"> - Application of a linear function to some convex</span>
<a name="l00018"></a>00018 <span class="comment"> - Verification that a convex is included in some other convex</span>
<a name="l00019"></a>00019 <span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment"> They are compiled together into an executable file called "test".</span>
<a name="l00021"></a>00021 <span class="comment"> The file test.in contains sample input data for the program.</span>
<a name="l00022"></a>00022 <span class="comment"> The file test.out contains the output produced by the program.</span>
<a name="l00023"></a>00023 <span class="comment"></span>
<a name="l00024"></a>00024 <span class="comment"> This directory also contains a makefile to build and run the test.</span>
<a name="l00025"></a>00025 <span class="comment"></span>
<a name="l00026"></a>00026 <span class="comment"> This file is a tutorial on how to use the library. The comments</span>
<a name="l00027"></a>00027 <span class="comment"> explain whats going on. You can use this file as a pattern for your</span>
<a name="l00028"></a>00028 <span class="comment"> own program. Good Luck !</span>
<a name="l00029"></a>00029 <span class="comment"></span>
<a name="l00030"></a>00030 <span class="comment"> --Doran</span>
<a name="l00031"></a>00031 <span class="comment">*/</span>
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="preprocessor">#include <stdio.h></span>
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="preprocessor">#include <<a class="code" href="polylib_8h.html">polylib/polylib.h</a>></span>
<a name="l00036"></a>00036
<a name="l00037"></a>00037
<a name="l00038"></a><a class="code" href="testlib_8c.html#e66f6b31b5ad750f1fe042a706a4e3d4">00038</a> <span class="keywordtype">int</span> <a class="code" href="c2p_8c.html#e66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <a class="code" href="structmatrix.html">Matrix</a> *a, *b, *t;
<a name="l00041"></a>00041 <a class="code" href="structpolyhedron.html">Polyhedron</a> *A, *B, *C, *D;
<a name="l00042"></a>00042
<a name="l00043"></a>00043 printf(<span class="stringliteral">"Polyhedral Library Test\n\n"</span>);
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="comment">/* read in a matrix containing your equations */</span>
<a name="l00046"></a>00046 <span class="comment">/* for example, run this program and type in these five lines:</span>
<a name="l00047"></a>00047 <span class="comment"> 4 4</span>
<a name="l00048"></a>00048 <span class="comment"> 1 0 1 -1</span>
<a name="l00049"></a>00049 <span class="comment"> 1 -1 0 6</span>
<a name="l00050"></a>00050 <span class="comment"> 1 0 -1 7</span>
<a name="l00051"></a>00051 <span class="comment"> 1 1 0 -2</span>
<a name="l00052"></a>00052 <span class="comment"> This is a matrix for the following inequalities</span>
<a name="l00053"></a>00053 <span class="comment"> 1 = inequality, 0x + 1y -1 >=0 --> y >= 1</span>
<a name="l00054"></a>00054 <span class="comment"> 1 = inequality, -1x + 0y +6 >=0 --> x <= 6</span>
<a name="l00055"></a>00055 <span class="comment"> 1 = inequality, 0x + -1y +7 >=0 --> y <= 7</span>
<a name="l00056"></a>00056 <span class="comment"> 1 = inequality, 1x + 0y -2 >=0 --> x >= 2</span>
<a name="l00057"></a>00057 <span class="comment"> If the first number is a 0 instead of a 1, then that constraint</span>
<a name="l00058"></a>00058 <span class="comment"> is an 'equality' instead of an 'inequality'.</span>
<a name="l00059"></a>00059 <span class="comment"> */</span>
<a name="l00060"></a>00060 a = <a class="code" href="matrix_8c.html#3a087ae9a03d5baf0b81831177931143">Matrix_Read</a>();
<a name="l00061"></a>00061
<a name="l00062"></a>00062 <span class="comment">/* read in a second matrix containing a second set of constraints:</span>
<a name="l00063"></a>00063 <span class="comment"> for example :</span>
<a name="l00064"></a>00064 <span class="comment"> 4 4</span>
<a name="l00065"></a>00065 <span class="comment"> 1 1 0 -1</span>
<a name="l00066"></a>00066 <span class="comment"> 1 -1 0 3</span>
<a name="l00067"></a>00067 <span class="comment"> 1 0 -1 5</span>
<a name="l00068"></a>00068 <span class="comment"> 1 0 1 -2</span>
<a name="l00069"></a>00069 <span class="comment"> */</span>
<a name="l00070"></a>00070 b = <a class="code" href="matrix_8c.html#3a087ae9a03d5baf0b81831177931143">Matrix_Read</a>();
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="comment">/* Convert the constraints to a Polyhedron.</span>
<a name="l00073"></a>00073 <span class="comment"> This operation 1. Computes the dual ray/vertice form of the</span>
<a name="l00074"></a>00074 <span class="comment"> system, and 2. Eliminates redundant constraints and reduces</span>
<a name="l00075"></a>00075 <span class="comment"> them to a minimal form.</span>
<a name="l00076"></a>00076 <span class="comment"> */</span>
<a name="l00077"></a>00077 A = <a class="code" href="polyhedron_8c.html#efb77665a187d751bdd44f106b12465e" title="Given a matrix of constraints (&#39;Constraints&#39;), construct and return a polyhedron...">Constraints2Polyhedron</a>(a, 200);
<a name="l00078"></a>00078 B = <a class="code" href="polyhedron_8c.html#efb77665a187d751bdd44f106b12465e" title="Given a matrix of constraints (&#39;Constraints&#39;), construct and return a polyhedron...">Constraints2Polyhedron</a>(b, 200);
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <span class="comment">/* the 200 is the size of the working space (in terms of number</span>
<a name="l00081"></a>00081 <span class="comment"> of rays) that is allocated temporarily</span>
<a name="l00082"></a>00082 <span class="comment"> -- you can enlarge or reduce it as needed */</span>
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="comment">/* There is likewise a rays to polyhedron procedure */</span>
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="comment">/* Since you are done with the matrices a and b, be a good citizen</span>
<a name="l00087"></a>00087 <span class="comment"> and clean up your garbage */</span>
<a name="l00088"></a>00088 <a class="code" href="matrix_8c.html#fcb312b7c12a6997cd66964ecc34e1a6">Matrix_Free</a>(a);
<a name="l00089"></a>00089 <a class="code" href="matrix_8c.html#fcb312b7c12a6997cd66964ecc34e1a6">Matrix_Free</a>(b);
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="comment">/* If you want the the reduced set of equations back, you can</span>
<a name="l00092"></a>00092 <span class="comment"> either learn to read the polyhedron structure (not hard,</span>
<a name="l00093"></a>00093 <span class="comment"> look in "types.h"...</span>
<a name="l00094"></a>00094 <span class="comment"> or you can get the matrix back in the same format it started</span>
<a name="l00095"></a>00095 <span class="comment"> in... */</span>
<a name="l00096"></a>00096 a = <a class="code" href="polyhedron_8c.html#69417a994cd682d0c391ecff6d223cd2">Polyhedron2Constraints</a>(A);
<a name="l00097"></a>00097 b = <a class="code" href="polyhedron_8c.html#69417a994cd682d0c391ecff6d223cd2">Polyhedron2Constraints</a>(B);
<a name="l00098"></a>00098
<a name="l00099"></a>00099 <span class="comment">/* Take a look at them if you want */</span>
<a name="l00100"></a>00100 printf(<span class="stringliteral">"\na ="</span>);
<a name="l00101"></a>00101 <a class="code" href="matrix_8c.html#d4c3c350dba633f72bbcf3609b6b67d7">Matrix_Print</a>(stdout,<a class="code" href="types_8h.html#e6f16bcd4a42ba51cbb003e3d1e1cde6">P_VALUE_FMT</a>,a);
<a name="l00102"></a>00102 printf(<span class="stringliteral">"\nb ="</span>);
<a name="l00103"></a>00103 <a class="code" href="matrix_8c.html#d4c3c350dba633f72bbcf3609b6b67d7">Matrix_Print</a>(stdout,<a class="code" href="types_8h.html#e6f16bcd4a42ba51cbb003e3d1e1cde6">P_VALUE_FMT</a>,b);
<a name="l00104"></a>00104
<a name="l00105"></a>00105 <a class="code" href="matrix_8c.html#fcb312b7c12a6997cd66964ecc34e1a6">Matrix_Free</a>(a);
<a name="l00106"></a>00106 <a class="code" href="matrix_8c.html#fcb312b7c12a6997cd66964ecc34e1a6">Matrix_Free</a>(b);
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="comment">/* To intersect the two systems, use the polyhedron formats... */</span>
<a name="l00109"></a>00109 C = <a class="code" href="polyhedron_8c.html#c5a1a2751f0b833183560af25b18033b">DomainIntersection</a>(A, B, 200);
<a name="l00110"></a>00110
<a name="l00111"></a>00111 <span class="comment">/* Again, the 200 is the size of the working space */</span>
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="comment">/* This time, lets look a the polyhedron itself... */</span>
<a name="l00114"></a>00114 printf(<span class="stringliteral">"\nC = A and B ="</span>);
<a name="l00115"></a>00115 <a class="code" href="polyhedron_8c.html#d87595bd01c5cdd0f3933824943db496">Polyhedron_Print</a>(stdout,<a class="code" href="types_8h.html#e6f16bcd4a42ba51cbb003e3d1e1cde6">P_VALUE_FMT</a>,C);
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="comment">/* </span>
<a name="l00118"></a>00118 <span class="comment"> * The operations DomainUnion, DomainDifference, and DomainConvex</span>
<a name="l00119"></a>00119 <span class="comment"> * are also available </span>
<a name="l00120"></a>00120 <span class="comment"> */</span>
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="comment">/* </span>
<a name="l00123"></a>00123 <span class="comment"> * Read in a third matrix containing a transformation matrix,</span>
<a name="l00124"></a>00124 <span class="comment"> * this one swaps the indices (x,y --> y,x):</span>
<a name="l00125"></a>00125 <span class="comment"> * 3 3</span>
<a name="l00126"></a>00126 <span class="comment"> * 0 1 0</span>
<a name="l00127"></a>00127 <span class="comment"> * 1 0 0</span>
<a name="l00128"></a>00128 <span class="comment"> * 0 0 1</span>
<a name="l00129"></a>00129 <span class="comment"> */</span>
<a name="l00130"></a>00130
<a name="l00131"></a>00131
<a name="l00132"></a>00132 t = <a class="code" href="matrix_8c.html#3a087ae9a03d5baf0b81831177931143">Matrix_Read</a>();
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="comment">/* Take the preimage (transform the equations) of the domain C to</span>
<a name="l00135"></a>00135 <span class="comment"> get D. Are you catching on to this 200 thing yet ??? */</span>
<a name="l00136"></a>00136
<a name="l00137"></a>00137 D = <a class="code" href="polyhedron_8c.html#53d52d5d1befc1d1446e0920556c3d24">Polyhedron_Preimage</a>(C, t, 200);
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="comment">/* cleanup please */</span>
<a name="l00140"></a>00140 <a class="code" href="matrix_8c.html#fcb312b7c12a6997cd66964ecc34e1a6">Matrix_Free</a>(t);
<a name="l00141"></a>00141
<a name="l00142"></a>00142 printf(<span class="stringliteral">"\nD = transformed C ="</span>);
<a name="l00143"></a>00143 <a class="code" href="polyhedron_8c.html#d87595bd01c5cdd0f3933824943db496">Polyhedron_Print</a>(stdout,<a class="code" href="types_8h.html#e6f16bcd4a42ba51cbb003e3d1e1cde6">P_VALUE_FMT</a>,D);
<a name="l00144"></a>00144 <a class="code" href="polyhedron_8c.html#e6d0a7daf8e801a777fc8e93d8cfe43a">Domain_Free</a>(D);
<a name="l00145"></a>00145
<a name="l00146"></a>00146 <span class="comment">/* in a similar way, Polyhedron_Image(dom, mat, 200), takes the image</span>
<a name="l00147"></a>00147 <span class="comment"> of dom under matrix mat (transforms the vertices/rays) */</span>
<a name="l00148"></a>00148
<a name="l00149"></a>00149 <span class="comment">/* The function PolyhedronIncludes(Pol1, Pol2) returns 1 if Pol1</span>
<a name="l00150"></a>00150 <span class="comment"> includes (covers) Pol2, and a 0 otherwise */</span>
<a name="l00151"></a>00151
<a name="l00152"></a>00152 <span class="keywordflow">if</span> (<a class="code" href="polyhedron_8c.html#107a96d44465428ffcd25f1ab3d67b43">PolyhedronIncludes</a>(A,C))
<a name="l00153"></a>00153 printf(<span class="stringliteral">"\nWe expected A to cover C since C = A intersect B\n"</span>);
<a name="l00154"></a>00154 <span class="keywordflow">if</span> (!<a class="code" href="polyhedron_8c.html#107a96d44465428ffcd25f1ab3d67b43">PolyhedronIncludes</a>(C,B))
<a name="l00155"></a>00155 printf(<span class="stringliteral">"and C does not cover B...\n"</span>);
<a name="l00156"></a>00156
<a name="l00157"></a>00157 <span class="comment">/* Final note: some functions are defined for Domains, others</span>
<a name="l00158"></a>00158 <span class="comment"> * for Polyhedrons. A domain is simply a list of polyhedrons.</span>
<a name="l00159"></a>00159 <span class="comment"> * Every polyhedron structure has a "next" pointer used to </span>
<a name="l00160"></a>00160 <span class="comment"> * make a list of polyhedrons... For instance, the union of</span>
<a name="l00161"></a>00161 <span class="comment"> * two disjoint polyhedra is a domain consisting of two polyhedra.</span>
<a name="l00162"></a>00162 <span class="comment"> * If you want the convex domain... you have to call </span>
<a name="l00163"></a>00163 <span class="comment"> * DomainConvex(Pol1, 200) explicity. </span>
<a name="l00164"></a>00164 <span class="comment"> * Note that includes does not work on domains, only on simple</span>
<a name="l00165"></a>00165 <span class="comment"> * polyhedrons...</span>
<a name="l00166"></a>00166 <span class="comment"> * Thats the end of the demo... write me if you have questions.</span>
<a name="l00167"></a>00167 <span class="comment"> * And remember to clean up... </span>
<a name="l00168"></a>00168 <span class="comment"> */</span>
<a name="l00169"></a>00169
<a name="l00170"></a>00170 <a class="code" href="polyhedron_8c.html#e6d0a7daf8e801a777fc8e93d8cfe43a">Domain_Free</a>(A);
<a name="l00171"></a>00171 <a class="code" href="polyhedron_8c.html#e6d0a7daf8e801a777fc8e93d8cfe43a">Domain_Free</a>(B);
<a name="l00172"></a>00172 <a class="code" href="polyhedron_8c.html#e6d0a7daf8e801a777fc8e93d8cfe43a">Domain_Free</a>(C);
<a name="l00173"></a>00173
<a name="l00174"></a>00174 <span class="keywordflow">return</span> 0;
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176
<a name="l00177"></a>00177
</pre></div></div>
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