X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=check%2Ftime_gammaseries.cpp;h=fc3bac235163f529d152c291457398bad767729d;hp=0bfbe302db0bb5ce2db89bbaa113162b54bc4dea;hb=2afa71937b3c12cdc70f01213baa8a92be4b604a;hpb=5b090bb7e4951b48a28c20ba21bf9810c86eb0ca

diff --git a/check/time_gammaseries.cpp b/check/time_gammaseries.cpp
index 0bfbe302..fc3bac23 100644
--- a/check/time_gammaseries.cpp
+++ b/check/time_gammaseries.cpp
@@ -3,7 +3,7 @@
  *  Some timings on series expansion of the Gamma function around a pole. */
 
 /*
- *  GiNaC Copyright (C) 1999-2000 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2015 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
@@ -17,69 +17,77 @@
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#include "times.h"
+#include "ginac.h"
+#include "timer.h"
+using namespace GiNaC;
+
+#include <iostream>
+#include <vector>
+using namespace std;
 
 unsigned tgammaseries(unsigned order)
 {
-    unsigned result = 0;
-    symbol x;
-    
-    ex myseries = series(tgamma(x),x==0,order);
-    // compute the last coefficient numerically:
-    ex last_coeff = myseries.coeff(x,order-1).evalf();
-    // compute a bound for that coefficient using a variation of the leading
-    // term in Stirling's formula:
-    ex bound = evalf(exp(ex(-.57721566490153286*(order-1)))/(order-1));
-    if (evalf(abs((last_coeff-pow(-1,order))/bound)) > numeric(1)) {
-        clog << "The " << order-1
-             << "th order coefficient in the power series expansion of tgamma(0) was erroneously found to be "
-             << last_coeff << ", violating a simple estimate." << endl;
-        ++result;
-    }
-    
-    return result;
+	unsigned result = 0;
+	symbol x;
+
+	ex myseries = series(GiNaC::tgamma(x),x==0,order);
+	// compute the last coefficient numerically:
+	ex last_coeff = myseries.coeff(x,order-1).evalf();
+	// compute a bound for that coefficient using a variation of the leading
+	// term in Stirling's formula:
+	ex bound = exp(-.57721566490153286*(order-1))/(order-1);
+	if (abs((last_coeff-pow(-1,ex(order)))/bound) > 1) {
+		clog << "The " << order-1
+		     << "th order coefficient in the power series expansion of tgamma(0) was erroneously found to be "
+		     << last_coeff << ", violating a simple estimate." << endl;
+		++result;
+	}
+
+	return result;
+}
+
+unsigned time_gammaseries()
+{
+	unsigned result = 0;
+
+	cout << "timing Laurent series expansion of Gamma function" << flush;
+
+	vector<unsigned> sizes;
+	vector<double> times;
+	timer omega;
+
+	sizes.push_back(20);
+	sizes.push_back(25);
+	sizes.push_back(30);
+	sizes.push_back(35);
+
+	for (vector<unsigned>::iterator i=sizes.begin(); i!=sizes.end(); ++i) {
+		omega.start();
+		result += tgammaseries(*i);
+		times.push_back(omega.read());
+		cout << '.' << flush;
+	}
+
+	// print the report:
+	cout << endl << "	order: ";
+	for (vector<unsigned>::iterator i=sizes.begin(); i!=sizes.end(); ++i)
+		cout << '\t' << *i;
+	cout << endl << "	time/s:";
+	for (vector<double>::iterator i=times.begin(); i!=times.end(); ++i)
+		cout << '\t' << *i;
+	cout << endl;
+	
+	return result;
 }
 
-unsigned time_gammaseries(void)
+extern void randomify_symbol_serials();
+
+int main(int argc, char** argv)
 {
-    unsigned result = 0;
-    
-    cout << "timing Laurent series expansion of Gamma function" << flush;
-    clog << "-------Laurent series expansion of Gamma function:" << endl;
-    
-    vector<unsigned> sizes;
-    vector<double> times;
-    timer omega;
-    
-    sizes.push_back(10);
-    sizes.push_back(15);
-    sizes.push_back(20);
-    sizes.push_back(25);
-    
-    for (vector<unsigned>::iterator i=sizes.begin(); i!=sizes.end(); ++i) {
-        omega.start();
-        result += tgammaseries(*i);
-        times.push_back(omega.read());
-        cout << '.' << flush;
-    }
-    
-    if (!result) {
-        cout << " passed ";
-        clog << "(no output)" << endl;
-    } else {
-        cout << " failed ";
-    }
-    // print the report:
-    cout << endl << "    order: ";
-    for (vector<unsigned>::iterator i=sizes.begin(); i!=sizes.end(); ++i)
-        cout << '\t' << (*i);
-    cout << endl << "    time/s:";
-    for (vector<double>::iterator i=times.begin(); i!=times.end(); ++i)
-        cout << '\t' << int(1000*(*i))*0.001;
-    cout << endl;
-    
-    return result;
+	randomify_symbol_serials();
+	cout << setprecision(2) << showpoint;
+	return time_gammaseries();
 }