Timeline for General method for under and over determined systems?
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 8, 2014 at 13:36 | history | edited | Alec Jacobson | CC BY-SA 3.0 |
added full recipe for answer
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| May 8, 2014 at 13:31 | history | edited | Alec Jacobson | CC BY-SA 3.0 |
added full recipe for answer
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| May 8, 2014 at 13:29 | vote | accept | Alec Jacobson | ||
| May 8, 2014 at 12:00 | comment | added | Alec Jacobson | I'm happy to implement my own approach with QR if it avoids a dense matrix of singular vectors... | |
| May 8, 2014 at 4:06 | comment | added | Conder | The SVD will give the answer, but it's not always the minimal amount of work to get a desired datum. They are implementations for sparse cases. stats.stackexchange.com/questions/41259/… I expect that using one of them is probably better than trying to implement one's own minimalist approach (with QR rather than full SVD). | |
| May 7, 2014 at 14:32 | comment | added | Alec Jacobson | My matrices are very large and sparse, so complete SVD is not really an option (I assume). | |
| May 7, 2014 at 8:54 | comment | added | Igor Khavkine | Does SVD not give you what you want? | |
| May 6, 2014 at 22:17 | answer | added | Alex Becker | timeline score: 4 | |
| May 6, 2014 at 22:12 | comment | added | Alec Jacobson | Preemptive strike: Here's an example of an under and over determined system: $$\left(\begin{array}{ccc}1&0&0\\1&0&0\\0&1&0\end{array}\right)\left(\begin{array}x_1\\x_2\\x_3\end{array}\right) = \left(\begin{array}{c}4\\5\\6\end{array}\right)$$ | |
| May 6, 2014 at 22:04 | history | asked | Alec Jacobson | CC BY-SA 3.0 |