Timeline for Different results from Solve depending upon the solution variables listed
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 22, 2015 at 4:28 | answer | added | Eric Towers | timeline score: 2 | |
| Sep 22, 2015 at 3:45 | history | tweeted | twitter.com/#!/StackMma/status/646168359273410560 | ||
| Sep 22, 2015 at 0:51 | comment | added | Dr. belisarius | Simpler Solve[{x == 1, dbtot == Sqrt[x^2], dib == dbtot}, {dib}] | |
| Sep 21, 2015 at 23:51 | comment | added | Bob Hanlon | Use ToRules with Reduce to get rules rather than equations as results. | |
| Sep 21, 2015 at 23:41 | comment | added | David G. Stork | @JackLaVigne Thanks... that is a help, but still a bit unsatisfactory. After all, I would like to extract the value of dib using dib /. Reduce[...] but that will not work elegantly. | |
| Sep 21, 2015 at 23:41 | answer | added | Bob Hanlon | timeline score: 5 | |
| Sep 21, 2015 at 23:33 | comment | added | Jack LaVigne | Replacing Solve with Reduce handles both your cases. I haven't the foggiest as to why Solve is struggling. | |
| Sep 21, 2015 at 22:55 | history | edited | David G. Stork | CC BY-SA 3.0 | deleted 26 characters in body |
| Sep 21, 2015 at 22:42 | history | edited | David G. Stork | CC BY-SA 3.0 | added 214 characters in body |
| Sep 21, 2015 at 22:39 | comment | added | David G. Stork | @MarcoB Thanks, but I'd really like to understand why the straightforward approach simply does not work for a set of very elementary equations and variable assignments. There should be no need to be smart about eliminating variables in such a situation. | |
| Sep 21, 2015 at 22:33 | comment | added | MarcoB | It is weird at first blush. I think I am missing something here. Anyway, you can ask Solve to explicitly eliminate dbtot from the system of equations, and then it will return your expected result: Solve[eq, dib, {dbtot}], where eq is your system of equations, returns {{dib -> -0.178513}}. | |
| Sep 21, 2015 at 22:25 | history | asked | David G. Stork | CC BY-SA 3.0 |