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doc: Add explanation of ':' optional input to numel(). * data.cc (Fnumel): Add explanation of ':' optional input.
author Rik <rik@octave.org>
date Wed, 07 Oct 2015 14:52:01 -0700
parents c6059134f5d3
children 5fc798a9b32c
comparison
equal deleted inserted replaced
20606:1b62fc4e1b2f 20607:db3286201347
2712 \n\ 2712 \n\
2713 @example\n\ 2713 @example\n\
2714 @var{a}(@var{idx1}, @var{idx2}, @dots{})\n\ 2714 @var{a}(@var{idx1}, @var{idx2}, @dots{})\n\
2715 @end example\n\ 2715 @end example\n\
2716 \n\ 2716 \n\
2717 Note that the indices do not have to be numerical. For example,\n\ 2717 Note that the indices do not have to be scalar numbers. For example,\n\
2718 \n\ 2718 \n\
2719 @example\n\ 2719 @example\n\
2720 @group\n\ 2720 @group\n\
2721 @var{a} = 1;\n\ 2721 @var{a} = 1;\n\
2722 @var{b} = ones (2, 3);\n\ 2722 @var{b} = ones (2, 3);\n\
2724 @end group\n\ 2724 @end group\n\
2725 @end example\n\ 2725 @end example\n\
2726 \n\ 2726 \n\
2727 @noindent\n\ 2727 @noindent\n\
2728 will return 6, as this is the number of ways to index with @var{b}.\n\ 2728 will return 6, as this is the number of ways to index with @var{b}.\n\
2729 Or the index could be the string @qcode{\":\"} which represents the colon\n\
2730 operator. For example,\n\
2731 \n\
2732 @example\n\
2733 @group\n\
2734 @var{a} = ones (5, 3);\n\
2735 numel (@var{a}, 2, \":\")\n\
2736 @end group\n\
2737 @end example\n\
2738 \n\
2739 @noindent\n\
2740 will return 3 as the second row has three column entries.\n\
2729 \n\ 2741 \n\
2730 This method is also called when an object appears as lvalue with cs-list\n\ 2742 This method is also called when an object appears as lvalue with cs-list\n\
2731 indexing, i.e., @code{object@{@dots{}@}} or @code{object(@dots{}).field}.\n\ 2743 indexing, i.e., @code{object@{@dots{}@}} or @code{object(@dots{}).field}.\n\
2732 @seealso{size}\n\ 2744 @seealso{size}\n\
2733 @end deftypefn") 2745 @end deftypefn")