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2019-06-26 12:21:03 +0100 | asked a question | Compute the square root of a complex matrix Hello, I can't find how to compute the square root of a complex matrix... I tried Thanks! EDIT: For now I'm using the numpy backend with manual diagonalisation, but I'd like to know if there is a better way to proceed... |

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2018-04-16 09:57:45 +0100 | asked a question | Square root of polynomial modulo another irreducible polynomial Hello, If I'm not wrong, it is always possible to compute the square root of a polynomial $P$ modulo an irreducible polynomial $g$ when the base field is in $GF(2^m)$, i.e. find $Q \in GF(2^m)$ such that $Q^2 \equiv P \mod g$. Indeed, the operation $Q \rightarrow Q^2 \pmod g$ should be linear (because we are in $GF(2^m)$) so an idea would be to compute the matrix $T$ that perform this operation, and then invert it, but I'd like to find an embedded operation in sage. I tried the sagemath $P.sqrt()$ method, but the problem is that because it does not take into account the modulo, it fails most of the time when the polynomial has some terms with odd power of $X$. Any idea? Thanks! |

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2018-04-16 09:46:37 +0100 | commented answer | Map a matrix to a block matrix Ok, thank you for your help ! |

2018-04-11 00:15:48 +0100 | asked a question | Map a matrix to a block matrix Hello, I have a function that maps an element $x$ into a $1\times n$ matrix, say for example $[x,x,x]$. I would like to map this function to a matrix and consider the resulting matrix as a "block matrix". E.g: change matrix([[1,2],[3,4]]) into matrix([[1,1,1,2,2,2],[3,3,3,4,4,4]]). For now, I use a trick that basically converts back the matrix to a a list using something like: but it looks quite dirty so I would like to know if there are some better way to proceed. Thank you! |

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2013-06-10 17:02:53 +0100 | asked a question | Choose the viewpoint in plot3d Hello, I would like to display lots of spheres (about 6000) in jmol but when I've to many points it crashs. If I try to run the interactive mode (even If don't have any picture) I've this error : "Jmol Applet #2 is having trouble loading. Will retry once." How could I do to get a picture of my work ? --- EDIT --- I found the function save('filename') and now I've a display, but I'd like to change the point of view. Is it possible ? Thanks, Tobias. |

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