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2016-04-19 05:57:51 -0500 | commented answer | Bug in matrix multiplication and inversion? ... and by the way, Mathematica just does it. |

2016-04-19 05:57:15 -0500 | commented answer | Bug in matrix multiplication and inversion? OK thanks. I did actually try |

2016-04-18 09:06:07 -0500 | asked a question | Bug in matrix multiplication and inversion? I'm using sage 7.1 and this code here returns What is going on? |

2016-04-04 06:15:19 -0500 | received badge | ● Popular Question (source) |

2016-01-07 13:55:53 -0500 | 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 11:18:04 -0500 | 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 11:14:59 -0500 | received badge | ● Commentator |

2016-01-07 11:14:59 -0500 | 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. |

2016-01-07 09:36:07 -0500 | 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 07:53:18 -0500 | 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 05:12:17 -0500 | 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 05:10:43 -0500 | 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 05:03:33 -0500 | 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 10:47:03 -0500 | commented answer | Black box numerical optimization of a convex function Thanks a lot for the detailed explanation! |

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2014-08-21 04:20:21 -0500 | 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 05:43:57 -0500 | 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: |

2014-06-28 20:15:31 -0500 | 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? |

2014-06-28 20:12:46 -0500 | 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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2014-02-06 20:39:18 -0500 | 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. |

2014-02-06 09:02:05 -0500 | asked a question | Sage and disk usage on MacOS Mavericks This is not really a sage question, but maybe somebody knows the answer anyway. I have installed sage.app on MacOS Mavericks. The unpacked application is roughly 6GB in size. Say after installation I have X GB free disk space. I now run sage in a terminal with Sage starts and does its usual little startup mambo, checking that all the paths are in order and such. After that, I have X-6 GB free disk space (as shown in Finder). When I quit sage, the disk space does not return, it seems gone. When I start sage the next day, I have X-12GB free disk space, but that seems to be it, on day three I don't lose any additional space. Even better, after a week or so not using sage, the 6GB packages come back one per day. What's the reason for this, and can I prevent it? I suspect that it has to do with MobileBackups and TimeMachine. If there was a huge change on my disk, I would see this in TimeMachine backup sizes, but they are small, like 500MB a day or so. Could it be that the MobileBackups mechanism which is independent of time machine makes a snapshot of the entire Application when something changes? What could this change be? Does the sage.app folder change on every startup? Is TimeMachine smart enough to backup only the presumably small changed file, but MobileBackups keeps a copy of the entire sage.app Folder? |

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2013-01-03 02:44:27 -0500 | marked best answer | Which variables are automagically defined in the sage shell? See sage/all.py and sage/all_cmdline.py in the devel/sage directory. In addition to |

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