*** empty log message ***

matexp.h

@@ -253,7 +253,7 @@ return r;
 template<class M, class V>
 void exptimesdestructive(const M &mat, V &result, V &rhs,  bool transpose=false, const double scale=1., int maxpower= -1, int maxtaylor= -1, bool mat_is_0=false) //uses just matrix vector multiplication
 {
-if(mat_is_0) {result=rhs; return;}
+if(mat_is_0) {result = rhs; LA_traits<V>::copyonwrite(result); return;} //prevent returning a shallow copy of rhs
 if(mat.nrows()!=mat.ncols()||(unsigned int) mat.nrows() != (unsigned int)rhs.size()) laerror("inappropriate sizes in exptimes");
 
 int power;