From: Christian Bauer
Date: Fri, 23 Mar 2001 17:45:59 +0000 (+0000)
Subject: documentation update
X-Git-Tag: release_0-8-0~8
X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=commitdiff_plain;h=c16c3a44e91e684797a04113e41362f02a0d367a;ds=sidebyside
documentation update
---
diff --git a/NEWS b/NEWS
index de39569d..3234725c 100644
--- a/NEWS
+++ b/NEWS
@@ -6,13 +6,16 @@ This file records noteworthy changes.
and two types of indices: "idx" for simple indices and "varidx" for
indices with variance. There are predefined delta, epsilon and metric
tensors, and a function simplify_indexed() that performs canonicalization
- and dummy index summations.
+ and dummy index summations. Matrix objects can be indexed for doing simple
+ linear algebra.
* Added an option "expand_indexed" to expand() to perform expansion of
indexed objects like (a+b).i -> a.i + b.i
* Renamed get_indices() to get_free_indices(), which no longer returns
dummy indices and checks the consistency of indices in sums.
* sqrfree() factorization fixed and improved syntactically.
* subs() works on matrices.
+* Matrices can be constructed from flat list of elements; diagonal matrices
+ can be constructed from list of diagonal elements with diag_matrix()
* Fixed memory leak in expand().
* Operator% for objects of class ncmul has gone. Use operator* now for that
case too, which is much more natural.