X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=check%2Ftime_lw_P.cpp;h=ecdebae97828e1e1af797eea1fe50d64a10b2f17;hp=37772ef104a1fdcbce5078518205a3c18cb506ee;hb=7cf5e1f6346223de683c9e7986d098fd042d691c;hpb=b6415364be14b7f3129ffe3d54e7c3c8bc74ed3c

diff --git a/check/time_lw_P.cpp b/check/time_lw_P.cpp
index 37772ef1..ecdebae9 100644
--- a/check/time_lw_P.cpp
+++ b/check/time_lw_P.cpp
@@ -4,7 +4,7 @@
  *  Lewis and Michael Wester. */
 
 /*
- *  GiNaC Copyright (C) 1999-2000 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -22,52 +22,60 @@
  */
 
 #include "times.h"
-#include "time_lw_w101n.h"
 
 static unsigned test(void)
 {
-    matrix m(101,101);
-    for (unsigned r=0; r<101; ++r) {
-        for (unsigned c=0; c<10; ++c) {
-            m.set(r,
-                  unsigned(ex_to_numeric(w101_numeric[r][2*c+1]).to_int()-1),
-                  w101_numeric[r][2*c+2]);
-        }
-    }
-    ex det = m.determinant();
-    
-    if (det!=numeric("75810815066186520")) {
-        clog << "det of sparse rank 101 matrix erroneously returned " << det << endl;
-        return 1;
-    }
-    return 0;
+	// This is a pattern that comes up in graph theory:
+	const unsigned n = 10;
+	matrix m(n*n+1,n*n+1);
+	for (unsigned i=1; i<=n*n; ++i)
+		m.set(i-1,i-1,1);
+	for (unsigned i=1; i<=n*n; ++i)
+		if (!(i%n))
+			m.set(i-1,n*n,1);
+	for (unsigned i=1; i<=n*n; ++i)
+		if (!((i-1)%n))
+			m.set(n*n,i-1,n-(i-1)/n);
+	for(unsigned i=1; i<=n; ++i)
+		for (unsigned j=1; j<=n; ++j)
+			if (i-j)
+				for (unsigned k=1; k<n; ++k)
+					m.set((i-1)*n+k-1,(j-1)*n+k,n+1-j);
+	
+	ex det = m.determinant();
+	
+	if (det!=numeric("75810815066186520")) {
+		clog << "det of sparse rank 101 matrix erroneously returned " << det << endl;
+		return 1;
+	}
+	return 0;
 }
 
 unsigned time_lw_P(void)
 {
-    unsigned result = 0;
-    unsigned count = 1;
-    timer rolex;
-    double time = .0;
-    
-    cout << "timing Lewis-Wester test P (det of sparse rank 101)" << flush;
-    clog << "-------Lewis-Wester test P (det of sparse rank 101)" << endl;
-    
-    rolex.start();
-    // correct for very small times:
-    do {
-        result = test();
-        ++count;
-    } while ((time=rolex.read())<0.1 && !result);
-    cout << '.' << flush;
-    
-    if (!result) {
-        cout << " passed ";
-        clog << "(no output)" << endl;
-    } else {
-        cout << " failed ";
-    }
-    cout << int(1000*(time/count))*0.001 << 's' << endl;
-    
-    return result;
+	unsigned result = 0;
+	unsigned count = 0;
+	timer rolex;
+	double time = .0;
+	
+	cout << "timing Lewis-Wester test P (det of sparse rank 101)" << flush;
+	clog << "-------Lewis-Wester test P (det of sparse rank 101)" << endl;
+	
+	rolex.start();
+	// correct for very small times:
+	do {
+		result = test();
+		++count;
+	} while ((time=rolex.read())<0.1 && !result);
+	cout << '.' << flush;
+	
+	if (!result) {
+		cout << " passed ";
+		clog << "(no output)" << endl;
+	} else {
+		cout << " failed ";
+	}
+	cout << int(1000*(time/count))*0.001 << 's' << endl;
+	
+	return result;
 }