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2017-02-17 09:20:46 -0500 | marked best answer | Is there a way to simplify_full and trig_reduce a matrix? I know I can do it component by component and then construct a matrix out of the output. But it would be nice if I could just say matrix.trig_reduce() and get a matrix with all the components trig_reduced. Thanks in advance |

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2015-11-09 14:38:01 -0500 | asked a question | substitute function for an array of functions Hello, I have an array of functions defined as I also have a function of function If I use substitute_function on the function of function it works. However, the following command does not work, The reason I think is that arr[0] has an argument by y0 does not. Is it possible to use substitute_function where the arguments have arguments? |

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2015-03-26 22:12:09 -0500 | marked best answer | Problem calling np.random.multinomial from notebook According to np.random.multinomial? this is what I should expect However when I type the same thing in notebook I get an error. The same command works fine in my system python. In sage notebook it works when I drop the argument size=2. This seems to be problem with sage notebook. Any suggestions? |

2015-03-26 22:12:09 -0500 | marked best answer | Is it possible to join matrices in to a bigger matrix? I have two symbolic $2 \times 2$ matrices $A$ and $B$. I want to join them into a $4 \times 4$ matrix of the form $\begin{pmatrix}A & B \cr B & A\end{pmatrix}$. The problem is that when I give I get a three dimensional object, not a four by four matrix. The actual matrices I am working with are bigger than this, so I don't want to do it by hand. Is there a way of doing this without a bunch of for loops? |

2015-03-26 22:12:06 -0500 | marked best answer | Is it possible to convert a string to mapping? I am trying to develop a program which involves plotting. I am using matplotlib as a backend to plot histograms. In order to give the users more control over the plotting, I am trying to take a string from the users of the form and then passing is to a histogram using I get a error saying that kwargs must be a mapping not a string. Is there a way to convert a string to kwargs mapping? I am not trying to do this so that it works just for alhpa, but any option that hist accepts. |

2015-03-26 22:12:04 -0500 | marked best answer | Interface of maxima atensor with sage I am trying to use the atensor module of maxima in sage. I have trouble understanding the meaning of the symbols. According to the manual the basis of the algebra is given by v[1], v[2] etc, and atensimp(v[1].v[1]) should give -1. But, when I try to reproduce the result, I get the following. I am trying to reproduce the algebra of gamma matrices where {,} stands for anticommutator. and eta^{mu nu} is the metric. as described here http://en.wikipedia.org/wiki/Gamma_matrices |

2015-03-26 22:12:00 -0500 | marked best answer | Compatibility of sagetex with arXiv and journals? I was wondering whether anybody has any experience with trying to upload a draft created with sagetex on arXiv or journal servers. Normally arXiv prefers a tex file with figures in a tar.gz file. However, I was just trying to include a figure in a document and trying to compile it with sagetex. The problem is that I don't get a tex file and figure that I can upload on arXiv. Is there a way to get a tex file and eps figues from sagetex, so that the whole thing can be compiled by the arXiv and journal servers (APS for example) |

2015-03-26 22:11:50 -0500 | marked best answer | why won't simplify multiply out square roots? I was trying to remove half angles in an expression. And it seems simplify() does not like to multiply out square root. The output I get is $\frac{1}{2}\sqrt{-\cos\left(\theta\right) + 1} \sqrt{\cos\left(\theta\right) + 1}$ Is there a way I can make sage multiply out the the expression and give me $(1/2)sin \theta$ |

2015-03-26 22:10:30 -0500 | marked best answer | Is it possible to find the exponential of a symbolic matrix using sage? I am searching for a function that is equivalent to mathematica's MatrixExp, that will calculate the exponential of a symbolic matrix. I don't want a term by term exponential but a something like expm() in scipy but for symbolic matrices. Is it possible in sage? |

2015-03-26 22:08:28 -0500 | marked best answer | Is there a way to save to to animations in the same avi file I have two animations, I created using the animate command, which I want to save in the same avi or gif file one below another. Is there a way to do it. I tried (a+b).savefig(), but it saves the two animations on top of one another. I want something like the graphics_array but for animations. Thanks in advance. |

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