X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fex.cpp;h=23a30833b5a436375918e34358a4208376cf00d6;hp=cced24e428d09d385eac0134fbcc8f9705831fc6;hb=a32a30d8ccdd0eb945b8180c8fe82d154e9280de;hpb=695f6ae955ec530cded8f21efd5569df39447f76

diff --git a/ginac/ex.cpp b/ginac/ex.cpp
index cced24e4..23a30833 100644
--- a/ginac/ex.cpp
+++ b/ginac/ex.cpp
@@ -3,7 +3,7 @@
  *  Implementation of GiNaC's light-weight expression handles. */
 
 /*
- *  GiNaC Copyright (C) 1999-2005 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2008 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
@@ -17,7 +17,7 @@
  *
  *  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 <iostream>
@@ -28,6 +28,7 @@
 #include "mul.h"
 #include "ncmul.h"
 #include "numeric.h"
+#include "matrix.h"
 #include "power.h"
 #include "lst.h"
 #include "relational.h"
@@ -240,6 +241,31 @@ ex ex::rhs() const
 	return bp->op(1);
 }
 
+/** Check whether expression is a polynomial. */
+bool ex::is_polynomial(const ex & vars) const
+{
+	if (is_a<lst>(vars)) {
+		const lst & varlst = ex_to<lst>(vars);
+		for (lst::const_iterator i=varlst.begin(); i!=varlst.end(); ++i)
+			if (!bp->is_polynomial(*i))
+				return false;
+		return true;
+	}
+	else
+		return bp->is_polynomial(vars);
+}
+
+/** Check whether expression is zero or zero matrix. */
+bool ex::is_zero_matrix() const
+{
+	if (is_zero())
+		return  true;
+	else {
+		ex e = evalm();
+		return is_a<matrix>(e) && ex_to<matrix>(e).is_zero_matrix();
+	}
+}
+
 // private
 
 /** Make this ex writable (if more than one ex handle the same basic) by