Mercurial > octave-nkf
comparison src/DLD-FUNCTIONS/ccolamd.cc @ 5506:b4cfbb0ec8c4
[project @ 2005-10-23 19:09:32 by dbateman]
| author | dbateman |
|---|---|
| date | Sun, 23 Oct 2005 19:09:33 +0000 |
| parents | ed08548b9054 |
| children | 2857357f9d3c |
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| 5505:17682e3fba2a | 5506:b4cfbb0ec8c4 |
|---|---|
| 69 value of @code{[0 10 10 1 0]} if not present or empty. Entries not present\n\ | 69 value of @code{[0 10 10 1 0]} if not present or empty. Entries not present\n\ |
| 70 are set to their defaults.\n\ | 70 are set to their defaults.\n\ |
| 71 \n\ | 71 \n\ |
| 72 @table @code\n\ | 72 @table @code\n\ |
| 73 @item @var{knobs}(1)\n\ | 73 @item @var{knobs}(1)\n\ |
| 74 if nonzero, the ordering is optimized for @code{lu(S(:,p)). It will be a\n\ | 74 if nonzero, the ordering is optimized for @code{lu(S(:,p))}. It will be a\n\ |
| 75 poor ordering for @code{chol(@var{s}(:,@var{p})'*@var{s}(:,@var{p}))}. This\n\ | 75 poor ordering for @code{chol(@var{s}(:,@var{p})'*@var{s}(:,@var{p}))}. This\n\ |
| 76 is the most important knob for ccolamd.\n\ | 76 is the most important knob for ccolamd.\n\ |
| 77 \n\ | 77 \n\ |
| 78 @item @var{knob}(2)\n\ | 78 @item @var{knob}(2)\n\ |
| 79 if @var{s} is m-by-n, rows with more than @code{max(16,@var{knobs}(2)*\n\ | 79 if @var{s} is m-by-n, rows with more than @code{max(16,@var{knobs}(2)*\n\ |
| 98 the output permutation @var{p}, all columns in set 1 appear first, followed\n\ | 98 the output permutation @var{p}, all columns in set 1 appear first, followed\n\ |
| 99 by all columns in set 2, and so on. @code{@var{cmember} = ones(1,n)} if\n\ | 99 by all columns in set 2, and so on. @code{@var{cmember} = ones(1,n)} if\n\ |
| 100 not present or empty. @code{ccolamd (@var{s},[],1:n)} returns @code{1:n}\n\ | 100 not present or empty. @code{ccolamd (@var{s},[],1:n)} returns @code{1:n}\n\ |
| 101 \n\ | 101 \n\ |
| 102 @code{@var{p} = ccolamd(@var{s})} is about the same as @code{@var{p} =\n\ | 102 @code{@var{p} = ccolamd(@var{s})} is about the same as @code{@var{p} =\n\ |
| 103 colamd(@var{s}). @var{knobs} and its default values differ. @code{colamd}\n\ | 103 colamd(@var{s})}. @var{knobs} and its default values differ. @code{colamd}\n\ |
| 104 always does aggressive absorption, and it finds an ordering suitable for\n\ | 104 always does aggressive absorption, and it finds an ordering suitable for\n\ |
| 105 both @code{lu(@var{s}(:,@var{p}))} and @code{chol(@var{S}(:,@var{p})'*\n\ | 105 both @code{lu(@var{s}(:,@var{p}))} and @code{chol(@var{S}(:,@var{p})'*\n\ |
| 106 @var{s}(:,@var{p}))}; it cannot optimize its ordering for @code{lu(@var{s}\n\ | 106 @var{s}(:,@var{p}))}; it cannot optimize its ordering for @code{lu(@var{s}\n\ |
| 107 (:,@var{p}))} to the extent that @code{ccolamd(@var{s},1)} can.\n\ | 107 (:,@var{p}))} to the extent that @code{ccolamd(@var{s},1)} can.\n\ |
| 108 \n\ | 108 \n\ |