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2015-03-27 04:07:00 +0200 | marked best answer | Suppressing warning messages When I do the following sage code, I get a warning message:: This piece of code is repeated several times in a larger project, and all the warning messages are messing up the output. Is there a way to turn them off? (Yes, I do need to use QQbar, even though this example didn't use it.) Thanks! |

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2014-06-18 16:12:38 +0200 | commented answer | algebra of differential operators Thanks! This is a great solution. |

2014-06-18 16:11:28 +0200 | marked best answer | algebra of differential operators Here is an implementation combining the other two ideas here: If you just want to see the operator, you can apply Here's how to use it for your example: You can simplify symbolic expressions like this: |

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2014-06-12 21:23:22 +0200 | commented answer | algebra of differential operators This is not what I meant. I've added a clarification in my post. Is the clarification clearer? |

2014-06-12 18:22:02 +0200 | asked a question | algebra of differential operators I'm trying to use Sage to check if an explicit function satisfies a PDE. As an example, I would like to be able to apply the operator $\prod_{n=1}^5(t \frac{\partial}{\partial t} - n)$ to $zt e^{t/z}$. What are my options for doing this in Sage? I found a relevant post on this site, which almost does what I want, but not quite. In the context of that post, I'd like to be able to do something like this: But of course, this doesn't work. Thanks! To be clear, I'm asking about the following operator: $$\prod_{n=1}^5(t \frac{\partial}{\partial t} - n) = (t\frac{\partial}{\partial t} - 1)(t\frac{\partial}{\partial t}-2)(t\frac{\partial}{\partial t}-3)$$ $$=\bigg(t\frac{\partial}{\partial t}-1\bigg)\bigg(\big(t\frac{\partial}{\partial t} + t^2 \frac{\partial^2}{\partial t^2}\big) - 5t\frac{\partial}{\partial t} + 6\bigg)$$ $$= \ldots $$ I don't want to finish the expansion by hand. I want Sage to do it for me, and then apply the whole mess to the function $zt e^{t/z}$. |

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2013-02-26 19:16:31 +0200 | asked a question | Sage notebook tab completion for attached files My research group recently published a worksheet on the alpha.sagenb.org website ("LGModels worksheet", if you want to look) as a way to make our code available to other people working on LG mirror symmetry. We uploaded our code using the "data" option on the worksheet. My issue is, the tab completion doesn't work for objects defined in the uploaded files. Does anyone know why this is or if there is a way to fix it? Additional question: does anyone know the future of the alpha.sagenb website? Thanks! |

2012-11-20 15:49:15 +0200 | answered a question | matrix entry-wise comparison (masking) This is a follow-up to DSM's answer. Just for future reference, I found that I can turn the Trues and Falses into 1's and 0's in the following way: |

2012-11-20 15:44:54 +0200 | marked best answer | matrix entry-wise comparison (masking) That's how |

2012-11-20 13:43:49 +0200 | asked a question | matrix entry-wise comparison (masking) Hello, I've heard that in some programming languages it is possible to "mask" your matrix. That is, I should be able to do something like Or perhaps the matrix outputted would have 0's and 1's (that would be more convenient). Is there a way to do this in Sage, perhaps using some object other than a matrix? Thanks! |

2012-08-30 21:30:49 +0200 | answered a question | inheriting from CombinatorialFreeModule So, I asked my question just a few minutes too soon. I had two problems: I needed to define the TestRingElement before TestRing, and I needed to specify the I am still curious, though, if anyone can answer my other question about passing in lists to the constructor. |

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2012-08-30 21:08:46 +0200 | asked a question | inheriting from CombinatorialFreeModule I am trying to write a class that inherits from CombinatorialFreeModule. My problem is correctly inheriting from the element class. I have the following code: I can create a TestRing object and get its basis elements as follows: My problem is that I want to be able to add more attributes to the elements of my module. Can someone tell me the correct way to do this? Incidentally, this code breaks when I call Thanks! |

2011-12-19 19:48:59 +0200 | commented answer | determine consistency of nonlinear system of equations Great answer! Thanks. |

2011-12-08 14:32:48 +0200 | asked a question | determine consistency of nonlinear system of equations Hello, I need to be able to determine the consistency of very large systems of polynomial equations, with 30-40 variables and as many equations. When I put such systems into
This is not a complete system - just a few equations to show the lengths of equations that tend to come up. Again, I don't care what any solutions are; I just need to know if any exist. Is there a way to do this in sage? Thanks! |

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