X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=check%2Fexam_powerlaws.cpp;h=b81760357852be8c8a0abe288228d5df85fcb3a7;hp=d84a0818443a8377e6f70de47a83173c47c38aa0;hb=1fa7d19af08892800dfdb0b700bc0a9362a3fae8;hpb=c3c748381bda4f81b68e50db2eed440c19f24b85

diff --git a/check/exam_powerlaws.cpp b/check/exam_powerlaws.cpp
index d84a0818..b8176035 100644
--- a/check/exam_powerlaws.cpp
+++ b/check/exam_powerlaws.cpp
@@ -4,7 +4,7 @@
  *  this code, it is a sanity check rather deeply rooted in GiNaC's classes. */
 
 /*
- *  GiNaC Copyright (C) 1999-2007 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
@@ -21,11 +21,12 @@
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#include <iostream>
 #include "ginac.h"
-using namespace std;
 using namespace GiNaC;
 
+#include <iostream>
+using namespace std;
+
 static unsigned exam_powerlaws1()
 {
 	// (x^a)^b = x^(a*b)
@@ -68,14 +69,14 @@ static unsigned exam_powerlaws1()
 		return 1;
 	}
 	
-	ex e4 = e1.subs(lst(a==-1, b==2.5));
+	ex e4 = e1.subs(lst(a==-1, b==-2.5));
 	if (!(is_exactly_a<power>(e4) &&
 	      is_exactly_a<power>(e4.op(0)) &&
 	      is_exactly_a<symbol>(e4.op(0).op(0)) &&
 	      is_exactly_a<numeric>(e4.op(0).op(1)) &&
 	      is_exactly_a<numeric>(e4.op(1)) &&
-	      e4.is_equal(power(power(x,-1),2.5)) )) {
-		clog << "(x^a)^b, x symbolic, a==-1, b==2.5 wrong" << endl;
+	      e4.is_equal(power(power(x,-1),-2.5)) )) {
+		clog << "(x^a)^b, x symbolic, a==-1, b==-2.5 wrong" << endl;
 		clog << "returned: " << e4 << endl;
 		return 1;
 	}
@@ -287,6 +288,37 @@ static unsigned exam_powerlaws5()
 	return 0;
 }
 
+static unsigned exam_powerlaws6()
+{
+	// check expansion rules for positive symbols
+
+	symbol a("a");
+	symbol b("b");
+	symbol c("c");
+	realsymbol x("x");
+	realsymbol y("y");
+	possymbol p("p");
+	possymbol q("q");
+	numeric half=numeric(1,2);
+
+	ex e1 = pow(5*pow(3*a*b*x*y*p*q,2),7*half*c).expand();
+	ex e2 = pow(p,7*c)*pow(q,7*c)*pow(pow(a*b*x*y,2),numeric(7,2)*c)*pow(45,numeric(7,2)*c);
+	if (!e1.is_equal(e2)) {
+		clog << "Could not expand exponents with positive bases in " << e1 << endl;
+		return 1;
+	}
+
+	ex e3 = pow(-pow(-a*x*p,3)*pow(b*y*p,3),half*c).expand().normal();
+	ex e4 = pow(p,3*c)*pow(pow(a*b*x*y,3),half*c);
+
+	if (!e3.is_equal(e4)) {
+		clog << "Could not expand exponents with positive bases in " << e3 << endl;
+		return 1;
+	}
+
+	return 0;
+}
+
 unsigned exam_powerlaws()
 {
 	unsigned result = 0;
@@ -298,6 +330,7 @@ unsigned exam_powerlaws()
 	result += exam_powerlaws3();  cout << '.' << flush;
 	result += exam_powerlaws4();  cout << '.' << flush;
 	result += exam_powerlaws5();  cout << '.' << flush;
+	result += exam_powerlaws6();  cout << '.' << flush;
 	
 	return result;
 }