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changeset 11179:6ead75935ebf

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Explain that ranges in vectors do get expanded
author Jordi Gutiérrez Hermoso <jordigh@gmail.com>
date Mon, 30 Aug 2010 13:49:07 -0500
parents c08e9d4e54c7
children 1a26199cb212
files doc/ChangeLog doc/interpreter/numbers.txi
diffstat 2 files changed, 23 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/doc/ChangeLog	Tue Nov 02 19:15:19 2010 -0400
+++ b/doc/ChangeLog	Mon Aug 30 13:49:07 2010 -0500
@@ -1,3 +1,8 @@
+2010-11-01  Jordi Gutiérrez Hermoso  <jordigh@gmail.com>
+
+	* interpreter/numbers.txi: Explain that ranges in vectors do get
+	expanded.
+
 2010-10-24  Rik  <octave@nomad.inbox5.com>
 
 	* interpreter/doccheck/mk_undocumented_list: New verification
--- a/doc/interpreter/numbers.txi	Tue Nov 02 19:15:19 2010 -0400
+++ b/doc/interpreter/numbers.txi	Mon Aug 30 13:49:07 2010 -0500
@@ -393,6 +393,24 @@
 This allows you to write a constant like @samp{1 : 10000} without using
 80,000 bytes of storage on a typical 32-bit workstation.
 
+A common example of when it does become necessary to convert ranges into
+vectors occurs when they appear within a vector (i.e. inside square
+brackets). For instance, whereas
+
+@example
+x = 0 : 0.1 : 1;
+@end example
+
+defines @var{x} to be a variable of type @code{range} and occupies 24
+bytes of memory, the expression
+
+@example
+y = [ 0 : 0.1 : 1];
+@end example
+
+defines @var{y} to be of type @code{matrix} and occupies 88 bytes of
+memory.
+
 Note that the upper (or lower, if the increment is negative) bound on
 the range is not always included in the set of values, and that ranges
 defined by floating point values can produce surprising results because