From: Christian Bauer <Christian.Bauer@uni-mainz.de>
Date: Fri, 11 Jul 2003 19:24:32 +0000 (+0000)
Subject: synced to 1.1
X-Git-Tag: release_1-0-15~28
X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=commitdiff_plain;h=7bc96470ee0dd5c59a8ea1a29b74a781668606a1

synced to 1.1
---

diff --git a/doc/tutorial/ginac.texi b/doc/tutorial/ginac.texi
index ac033755..992a3ec2 100644
--- a/doc/tutorial/ginac.texi
+++ b/doc/tutorial/ginac.texi
@@ -3103,8 +3103,8 @@ Algebraic objects inside expressions can be replaced with arbitrary
 expressions via the @code{.subs()} method:
 
 @example
-ex ex::subs(const ex & e);
-ex ex::subs(const lst & syms, const lst & repls);
+ex ex::subs(const ex & e, unsigned options = 0);
+ex ex::subs(const lst & syms, const lst & repls, unsigned options = 0);
 @end example
 
 In the first form, @code{subs()} accepts a relational of the form
@@ -3132,6 +3132,15 @@ replaced and one for the expressions to be substituted (both lists must
 contain the same number of elements). Using this form, you would write
 @code{subs(lst(x, y), lst(y, x))} to exchange @samp{x} and @samp{y}.
 
+The optional last argument to @code{subs()} is a combination of
+@code{subs_options} flags. There are two options available:
+@code{subs_options::subs_no_pattern} disables pattern matching, which makes
+large @code{subs()} operations significantly faster if you are not using
+patterns. The second option, @code{subs_options::subs_algebraic} enables
+algebraic substitutions in products and powers.
+@ref{Pattern Matching and Advanced Substitutions}, for more information
+about patterns and algebraic substitutions.
+
 @code{subs()} performs syntactic substitution of any complete algebraic
 object; it does not try to match sub-expressions as is demonstrated by the
 following example:
@@ -3435,14 +3444,13 @@ The last example would be written in C++ in this way:
 @end example
 
 @subsection Algebraic substitutions
-The @code{subs()} method has an extra, optional, argument. This argument can
-be used to pass one of the @code{subs_options} to it. The only option that is
-currently available is the @code{subs_algebraic} option which affects
-products and powers. If you want to substitute some factors of a product, you
-only need to list these factors in your pattern. Furthermore, if an (integer)
-power of some expression occurs in your pattern and in the expression that you
-want the substitution to occur in, it can be substituted as many times as
-possible, without getting negative powers.
+Supplying the @code{subs_options::subs_algebraic} option to @code{subs()}
+enables smarter, algebraic substitutions in products and powers. If you want
+to substitute some factors of a product, you only need to list these factors
+in your pattern. Furthermore, if an (integer) power of some expression occurs
+in your pattern and in the expression that you want the substitution to occur
+in, it can be substituted as many times as possible, without getting negative
+powers.
 
 An example clarifies it all (hopefully):
 
@@ -3863,7 +3871,7 @@ x*z}.
 To bring an expression into expanded form, its method
 
 @example
-ex ex::expand();
+ex ex::expand(unsigned options = 0);
 @end example
 
 may be called.  In our example above, this corresponds to @math{4*x*y +