Mercurial > octave-nkf
comparison doc/interpreter/sparse.txi @ 7330:55f35e469c43
[project @ 2007-12-20 17:53:36 by jwe]
| author | jwe |
|---|---|
| date | Thu, 20 Dec 2007 17:53:36 +0000 |
| parents | e8d953d03f6a |
| children | fe332ce262b5 |
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| 7329:bf3fb3477d2a | 7330:55f35e469c43 |
|---|---|
| 533 @result{} 1 0 0 | 533 @result{} 1 0 0 |
| 534 0 1 0 | 534 0 1 0 |
| 535 0 0 1 | 535 0 0 1 |
| 536 @end example | 536 @end example |
| 537 | 537 |
| 538 returns a full matrix as can be seen. Additionally all sparse functions | 538 returns a full matrix as can be seen. |
| 539 test the amount of memory occupied by the sparse matrix to see if the | 539 |
| 540 amount of storage used is larger than the amount used by the full | 540 |
| 541 Additionally, if @code{sparse_auto_mutate} is true, all sparse functions | |
| 542 test the amount of memory occupied by the sparse matrix to see if the | |
| 543 amount of storage used is larger than the amount used by the full | |
| 541 equivalent. Therefore @code{speye (2) * 1} will return a full matrix as | 544 equivalent. Therefore @code{speye (2) * 1} will return a full matrix as |
| 542 the memory used is smaller for the full version than the sparse version. | 545 the memory used is smaller for the full version than the sparse version. |
| 543 | 546 |
| 544 As all of the mixed operators and functions between full and sparse | 547 As all of the mixed operators and functions between full and sparse |
| 545 matrices exist, in general this does not cause any problems. However, | 548 matrices exist, in general this does not cause any problems. However, |
| 561 | 564 |
| 562 should return a sparse matrix. To ensure this actually happens, the | 565 should return a sparse matrix. To ensure this actually happens, the |
| 563 @dfn{sparse} function, and other functions based on it like @dfn{speye}, | 566 @dfn{sparse} function, and other functions based on it like @dfn{speye}, |
| 564 always returns a sparse matrix, even if the memory used will be larger | 567 always returns a sparse matrix, even if the memory used will be larger |
| 565 than its full representation. | 568 than its full representation. |
| 569 | |
| 570 @DOCSTRING(sparse_auto_mutate) | |
| 571 | |
| 572 Note that the @code{sparse_auto_mutate} option is incompatible with | |
| 573 @sc{Matlab}, and so it is off by default. | |
| 566 | 574 |
| 567 @node MathConsiderations, , ReturnType, Operators and Functions | 575 @node MathConsiderations, , ReturnType, Operators and Functions |
| 568 @subsubsection Mathematical Considerations | 576 @subsubsection Mathematical Considerations |
| 569 | 577 |
| 570 The attempt has been made to make sparse matrices behave in exactly the | 578 The attempt has been made to make sparse matrices behave in exactly the |