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2016-04-19 12:57:51 +0100 | commented answer | Bug in matrix multiplication and inversion? ... and by the way, Mathematica just does it. |
2016-04-19 12:57:15 +0100 | commented answer | Bug in matrix multiplication and inversion? OK thanks. I did actually try |
2016-04-18 16:06:07 +0100 | asked a question | Bug in matrix multiplication and inversion? I'm using sage 7.1 and this code here returns What is going on? |
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2016-01-07 20:55:53 +0100 | commented answer | Sage 6.10 not working again on MacOS OK, thanks. It works now. So the directory is not relocatable after first start? |
2016-01-07 18:18:04 +0100 | answered a question | Sage 6.10 not working again on MacOS The temporary solution is to NOT RENAME the SageMath folder. Watch this: |
2016-01-07 18:14:59 +0100 | commented answer | Sage 6.10 not working again on MacOS OK, reproducably, If I rename the folder from SageMath to just "sage" I get this error. |
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2016-01-07 16:36:07 +0100 | commented answer | Sage 6.10 not working again on MacOS I did exactly this in the correct order. On the first start it also patched a lot of binaries (lots of stuff scrolling) and then yielded this error. Let me try again. |
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2016-01-06 14:53:18 +0100 | asked a question | Sage 6.10 not working again on MacOS There was a problem with Sage and MacOS El Capitan which was solved here: http://trac.sagemath.org/ticket/19370 For quite a while I used beta 1 of 6.10 which worked fine. Today I decided to move to 6.10 and it's back to non-working. What's going on? |
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2015-04-01 12:12:17 +0100 | answered a question | Test if an inequality is feasible under assumptions This seems to be the answer: http://trac.sagemath.org/ticket/6515 |
2015-04-01 12:10:43 +0100 | answered a question | Sage nb code won't run now: vector.transpose() throws error. It seems that a vector doesn't know if it is a row or a column vector. When you have a vector such as then and give it to you as row or column vectors. This must have been a change made to sage since your notebook was created. So to solve your problem, remove the transpose and relpace it with row or column if necessary. |
2015-04-01 12:03:33 +0100 | asked a question | Test if an inequality is feasible under assumptions I want to test if an inequality system is feasible under non-negativity assumptions. I run into the problem that the assumptions seem not be used by the inequality solver. Here is a minimal example Is it possible to have the solver use the assumptions and determine infeasibility of the system? |
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2014-08-31 17:47:03 +0100 | commented answer | Black box numerical optimization of a convex function Thanks a lot for the detailed explanation! |
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2014-08-21 11:20:21 +0100 | commented question | How to plot histogram from list? R is good for visualizing statistics. It is included in sage: http://ask.sagemath.org/question/7805/how-to-use-r-with-sage/ |
2014-08-19 12:43:57 +0100 | asked a question | Black box numerical optimization of a convex function I would like to numerically optimize a convex function without using any of its internals, that is, a python function. Is there an implementation of this in sage? I tried My function to optimize is in fact the second largest eigenvalue of a matrix that is constructed from one parameter. Here it is in all gory detail: |
2014-06-29 03:15:31 +0100 | marked best answer | Which variables are automagically defined in the sage shell? I'm using the sage-5.5 command line and some variables are automatically declared. For instance I can do but not My question: How does this come about? Which variables are defined like this? Where is this documented? |
2014-06-29 03:12:46 +0100 | marked best answer | Reinstall sage-mode after emacs upgrade Hi, I'm trying to reinstall sage mode after an upgrade of emacs (modules need to be byte-compiled with the new version of emacs). tells me that it is already installed and does nothing. |
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2014-02-07 03:39:18 +0100 | commented question | Sage and disk usage on MacOS Mavericks Hmm, turns out that sage.app folder was only around 3GB, not 6. Space disappears in 6GB packages, though. |