2019-04-12 11:54:01 +0100 | commented answer | Unflatten a vector and take the transpose then. that works. |

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2019-04-09 15:22:18 +0100 | asked a question | Unflatten a vector I have a vector say a $9 \times 1$ vector which looks like $$\begin{bmatrix} 2x +1 \newline x \newline 1 \newline x \newline x^2 + 2x \newline 2x \newline x \newline 2x^2 \newline 0 \newline \end{bmatrix}$$ with entries in $\mathbb{F}_3[x]$. There are 9 rows in this matrix and i want to write a function which takes an $n^2 \times 1$ matrix and turns it into a $n \times n$ matrix. So, in this case, we want the function would turn the above vector into $$ \begin{bmatrix} 2x+1 & x & 1 \newline x & x^2+2x & 2x \newline x & 2x^2 & 0 \newline \end{bmatrix} $$ In this Sage, I tried this: Then, write the following: This gave an error: |

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2019-03-06 03:44:27 +0100 | asked a question | What an efficient way to construct a n by n matrix with all entries -1? you could write create an empty list and then, create a column of -1 and augment it to the previous columns, do this n times but is there a faster way? |

2018-12-31 05:58:38 +0100 | commented question | Finding the kernel of a matrix in a non-integral domain a and b are in F3. yes, i should have mentioned. |

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2018-12-30 22:19:33 +0100 | asked a question | Finding the kernel of a matrix in a non-integral domain I have been trying to find the kernel of the matrix in a quotient, for example. If we have the following quotient ring in sage: and if I try to find the kernel of the matrix: It gives me the following error: NotImplementedError. I guess this is because F3[x]/(x^3) is not an integral domain but I would like a way around it. Thanks in advance. |

2018-12-30 22:19:33 +0100 | asked a question | Finding the kernel of a non-integral domain I have been trying to find the kernel of the matrix in a quotient, for example. If we have the following quotient ring in sage: R.<t> = PolynomialRing(GF(3),'t') I = R.ideal([t^3]) S = R.quotient_ring(I); and if I try to find the kernel of the matrix: E = Matrix(S, ([[0+a It gives me the following error: NotImplementedError. I guess this is because F3[x]/(x^3) is not an integral domain but I would like a way around it. Thanks in advance. |

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