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2016-02-02 12:14:14 +0200 | answered a question | Can I import M2 matrices into sage? I don't know anything about macaulay and don't have it installed, but I suggest you try to make the content of your command Does it give what you want ? Nathann |

2015-11-23 09:26:56 +0200 | commented answer | Suggestions for improving speed Here is a tutorial on profiling in Sage, in case you want to figure out what exactly is going too slow: http://doc.sagemath.org/html/en/thema... |

2015-11-06 09:27:49 +0200 | answered a question | Execution time vs. Computation time in MILP Aissan, Whatever you define through For GLPK, we copy/pasted the documentation from their manual in the doc of this function: http://doc.sagemath.org/html/en/refer... You can go check out their official doc to see if more precisions were given. Nathann |

2015-11-03 16:08:50 +0200 | answered a question | solver_parameter('timelimit') doesnt work Could you show us a minimal working example of what you do? If you tell me that you set the time limit and that the time limit is not respect, then it is a bug. |

2015-10-11 19:25:25 +0200 | answered a question | Multiplicative group of integers mod n? The integers modulo n are not a group with respect to multiplication. 1 is a unit element, but 0 has no inverse. |

2015-10-01 18:43:26 +0200 | answered a question | Error when computing Automorphism Group The error is that D is a tuple, and not a group. Read the documentation of direct_product, by typing |

2015-09-28 20:20:24 +0200 | commented answer | Binary variable in mixed integer linear program |

2015-09-28 20:20:06 +0200 | commented answer | Binary variable in mixed integer linear program I do not know, but you should ask on sage-support. Other will know better than I, and they may not read this thread. |

2015-09-28 09:18:03 +0200 | answered a question | Binary variable in mixed integer linear program No sorry, I do not think that any of the solvers we use support that. Did you think of modelling your problem as a SAT problem instead? Could it help? Obviously it may not be possible depending on what you want to solve, but it may also be easier with this other formalism. |

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2015-09-25 11:42:22 +0200 | answered a question | Adding relations to a poset It seems that you want to add relations to a poset until... it is not a poset anymore? Unfortunately (for you and I), posets have been made to be immutable (i.e. you can't modify one once it is built). Fortunately (for you and I) you do not |

2015-09-16 22:00:52 +0200 | answered a question | load a graph from a dot file This should work: Currently you can If you want to start contributing to Sage, that's a good starting point: useful contribution, and not technically complicated. Nathann |

2015-09-16 21:19:18 +0200 | commented answer | Transform a list of coefficients to polynomial (in GF(2^8)) No prob, I agree with you ;-) |

2015-09-16 16:01:29 +0200 | answered a question | Transform a list of coefficients to polynomial (in GF(2^8)) Here is a first solution And another, with "Horner's method": |

2015-09-08 12:28:30 +0200 | commented answer | How to use linear algebra inside of MixedIntegerLinearPrograms? It is true that the "matrix shortcut" that is used in the add_constraint method is not available in set_objective. That should be rather straightforward to implement, though. If any of you feels like contributing to Sage, that is a good occasion. |

2015-08-27 12:42:14 +0200 | commented answer | How do I generate list of connected graphs with given number of vertices? By "document" are you refering to the documentation of nauty_geng? If so, know that you can get the doc of any Sage function with a question mark. In the present case, just type In Sage. |

2015-08-25 09:20:31 +0200 | answered a question | How do I generate list of connected graphs with given number of vertices? If you read the documentation of nauty_geng, you will see that it has a '-c' flag to do exactly what you want. |

2015-08-13 09:43:20 +0200 | commented answer | Isomorphisms of 2-skeletons of polytopes It could make sense to have a .skeleton() method, by the way... |

2015-08-13 09:41:44 +0200 | answered a question | Isomorphisms of 2-skeletons of polytopes Couldn't you solve your problem by building the vertex graph of your polytope, and testing isomorphism between graphs? |

2015-08-07 23:56:11 +0200 | answered a question | delete_edge() Won't Delete Edges from Graph H = G does not make a copy of the graph. G and H are the very same object in memory, and if you modify one the other also contains the modification. It is the very same memory address. If you want to copy your graph, use H = copy(G). This is a behaviour that you should expect in any object-oriented language. |

2015-07-27 10:57:31 +0200 | answered a question | imports in sage/combinat/free_module.py For such questions, please write to sage-devel https://groups.google.com/forum/#!for... |

2015-07-21 17:49:21 +0200 | answered a question | Integer types and log() Could you please report this bug by sending a message to sage-devel [1]? You only need say that the following looks weird: About your problem: you can easily solve it by explicitly turning len(A) into a Sage integer: |

2015-07-19 19:36:37 +0200 | commented answer | How to call GAPs SmallGroup from sage? (I am getting an error, though the correct library is installed.) Err sorry, there is something that you can do (though you really should use the latest version of Sage): download this file into /Applications/Sage-6.5.app/Contents/Resources/sage/upstream/: http://mirror.switch.ch/mirror/sagema... You can then run 'sage -i database_gap' again. |

2015-07-19 19:34:15 +0200 | commented answer | How to call GAPs SmallGroup from sage? (I am getting an error, though the correct library is installed.) This is due to a recent change in our hosting. Not your fault, but the only thing you can do is download a more recent version of Sage. If you have further questions and need to post long logs, please write to sage-support instead: this forum is " okayish" for simple questions, but it's hard to read long logs and you have no way to insert them in your 'comments'. |

2015-07-19 07:39:56 +0200 | answered a question | How to call GAPs SmallGroup from sage? (I am getting an error, though the correct library is installed.) Run 'sage -i database_gap`, that solved it for me. I am going to check why the wrong message is apparently returned. Nathann |

2015-07-18 08:49:10 +0200 | answered a question | bug in the pq-trees library ? I get the following trace, in which 0,2 and 4 are contiguous. Perhaps your problem can be solved by using the latest version? |

2015-07-16 10:58:05 +0200 | commented answer | Multiprocessing Maximal Cliques Enumeration If you say that you have "some massive graphs", then to me your problem is of the second kind. And it would be much easier for you to parallelize it by solving several graphs at once. As per your pbitMCE algorithm, there are many ways to implement it in Sage, be it directly in Python code or in anything that can be compiled to a C library. You can then call it from Sage with http://doc.sagemath.org/html/en/thema... |

2015-07-15 17:02:06 +0200 | answered a question | Multiprocessing Maximal Cliques Enumeration If networkx's implementation did not change since last I read it, then yes both are mono-core indeed, and those two are the only ones available in Sage. What is your reason for wanting a mutithreaded version? Do you have one big graph in which you want to know all cliques? Or do you have many graphs in which you want to compute all cliques? In the latter case, you can much more easily parallelize the computations by running the same mono-threaded implementation on several instances at once. Nathann |

2015-07-13 13:14:52 +0200 | answered a question | Seeking an efficient filter for partitions. Would this work? |

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2015-07-08 13:46:09 +0200 | answered a question | add matrix as a contraint What about this? |

2015-05-30 13:44:16 +0200 | answered a question | Enumerating solutions to a system of linear relations Hello ! It seems that you are looking for that: http://doc.sagemath.org/html/en/refer... Note that it is a bit slow currently, but it should be improved in a couple of months if I get to do what I plan to. Also, in case you want to solve such a system of equations and would be looking for http://doc.sagemath.org/html/en/thema... Good luck, Nathann |

2015-05-03 11:54:48 +0200 | answered a question | How can I get Sage to go over all possible maps between two sets? To list all functions from Nathann |

2015-04-25 22:32:38 +0200 | answered a question | Hierholzer's algorithm Hello, Your explanation is far from clear, but it seems that Hierholzer's algorithm is meant to give you a eulerian circuit in a eulerian graph. Isn't your problem solved by calling Graph.eulerian_circuit ? http://www.sagemath.org/doc/reference... Nathann |

2015-04-24 11:39:25 +0200 | answered a question | How can I search and count all induced subgraphs in a directed graph with edge labels? |

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2015-04-14 18:12:28 +0200 | answered a question | A confusing syntax error when using elif The 'elif' should not be inside of the 'if' |

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2015-04-13 20:58:33 +0200 | answered a question | I want to review a ticket with positively reviewed dependencies. How do I use git to see the new changes? If a branch A depends on branches A1 A2 .. Ai, then in order to see the modifications that A makes without seeing those already made in A1, ..., Ai you can type: Of course the A and Ai must be names of branches or identifiers of commits. Nathann |

2015-04-03 17:09:05 +0200 | commented question | bug in the pq-trees library ? Could you please provide the commands to build your pq-tree? |

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