Improvements w.r.t. automatic renaming of dummy indices.

[ginac.git] / ginac / indexed.h

diff --git a/ginac/indexed.h b/ginac/indexed.h
index 7329e87db1c7b64bda0eb3205cbaa75126b5e0b2..0da2c421233385482ef4116c449d09b54245582d 100644 (file)
--- a/ginac/indexed.h
+++ b/ginac/indexed.h
@@ -153,7 +153,8 @@ protected:
        ex derivative(const symbol & s) const;
        ex thiscontainer(const exvector & v) const;
        ex thiscontainer(std::auto_ptr<exvector> vp) const;
-       unsigned return_type() const { return return_types::commutative; }
+       unsigned return_type() const;
+       unsigned return_type_tinfo() const { return op(0).return_type_tinfo(); }
        ex expand(unsigned options = 0) const;
 
        // new virtual functions which can be overridden by derived classes
@@ -250,6 +251,38 @@ template<> inline bool is_exactly_a<indexed>(const basic & obj)
        return obj.tinfo()==TINFO_indexed;
 }
 
+/** Returns all dummy indices from the expression */
+exvector get_all_dummy_indices(const ex & e);
+
+/** More reliable version of the form. The former assumes that e is an
+  * expanded epxression. */
+exvector get_all_dummy_indices_safely(const ex & e);
+
+/** Returns b with all dummy indices, which are listed in va, renamed 
+ *  if modify_va is set to TRUE all dummy indices of b will be appended to va */
+ex rename_dummy_indices_uniquely(exvector & va, const ex & b, bool modify_va = false);
+
+/** Returns b with all dummy indices, which are common with a, renamed */
+ex rename_dummy_indices_uniquely(const ex & a, const ex & b);
+
+/** Same as above, where va and vb contain the indices of a and b and are sorted */
+ex rename_dummy_indices_uniquely(const exvector & va, const exvector & vb, const ex & b);
+
+/** Similar to above, where va and vb are the same and the return value is a list of two lists 
+ *  for substitution in b */
+lst rename_dummy_indices_uniquely(const exvector & va, const exvector & vb);
+
+/** This function returns the given expression with expanded sums
+ *  for all dummy index summations, where the dimensionality of 
+ *  the dummy index is numeric.
+ *  Optionally all indices with a variance will be substituted by 
+ *  indices with the corresponding numeric values without variance.
+ *
+ *  @param e the given expression
+ *  @param subs_idx indicates if variance of dummy indixes should be neglected
+ */
+ex expand_dummy_sum(const ex & e, bool subs_idx = false);
+
 } // namespace GiNaC
 
 #endif // ndef __GINAC_INDEXED_H__