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[ginac.git] / check / time_gammaseries.cpp

diff --git a/check/time_gammaseries.cpp b/check/time_gammaseries.cpp
index 3715f836bb334544ca9608e11ce8460e22f51acf..f024c08a60e5a4ae81cc66c5f634537d6ebab468 100644 (file)
--- 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) 1999-2005 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2019 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
@@ -20,20 +20,26 @@
  *  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);
+       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,order))/bound) > 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;
@@ -48,17 +54,11 @@ unsigned time_gammaseries()
        unsigned result = 0;
 
        cout << "timing Laurent series expansion of Gamma function" << flush;
-       clog << "-------Laurent series expansion of Gamma function:" << endl;
 
-       vector<unsigned> sizes;
+       vector<unsigned> sizes = {20, 25, 30, 35};
        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);
@@ -66,12 +66,6 @@ unsigned time_gammaseries()
                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)
@@ -83,3 +77,12 @@ unsigned time_gammaseries()
        
        return result;
 }
+
+extern void randomify_symbol_serials();
+
+int main(int argc, char** argv)
+{
+       randomify_symbol_serials();
+       cout << setprecision(2) << showpoint;
+       return time_gammaseries();
+}