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2017-11-19 05:29:27 -0500 | answered a question | Substitution of subexpression What's about: http://sagecell.sagemath.org/?q=oynzya ? |

2017-11-06 10:49:28 -0500 | answered a question | How can I get back an expression for free variables in solve function. Are you looking for something like this ? |

2017-10-27 15:43:16 -0500 | commented answer | Can I import a graphic and add to it? You can resize an image. See PIL or PILLOW documentation. |

2017-10-27 01:37:21 -0500 | answered a question | Can I import a graphic and add to it? See an example using PIL here. Please note: The images 'test.png' and 'test2.png' have to match, (same size, aspect_ratio). |

2017-10-09 05:19:26 -0500 | answered a question | piecewise function with variable within domains What's about a python function? |

2017-10-06 16:10:10 -0500 | answered a question | Solving a system of equations -- small known number hinders the solution |

2017-09-20 04:40:48 -0500 | answered a question | connecting plots by lines My suggestion see http://sagecell.sagemath.org/?q=rmiwzc Put both plots together with suitable translation and axes. |

2017-09-03 05:00:55 -0500 | answered a question | Get the nth term of an equation.rhs() sum |

2017-08-19 09:46:42 -0500 | answered a question | Defining functions acting on matrix elements? We can use substitution The error message indicates that the type of M has changed. M is no longer a matrix over SR but a symbolic expression. When defining a symbolic function with a variable M, this M becomes (implicitly) a member of SR overwriting the previous definition of M. After redefining M as matrix: |

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2017-08-05 02:38:02 -0500 | answered a question | How to assume the sum of some variables is equal to a constant? |

2017-07-29 07:43:35 -0500 | commented answer | how accelerate this simple program
See an example: http://sagecell.sagemath.org/?q=bgdeqj Exact symbolic operations are much slower than numerical algorithms. Converting a symbolic expression to a numerical value takes additional time. |

2017-07-28 04:08:50 -0500 | answered a question | how accelerate this simple program One bottleneck comes from working with the symbolic ring. The following code is some hundred times faster (may be still not fast enough ;-) ) Update:
Using |

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2017-07-21 18:02:08 -0500 | answered a question | Piecewise Symbolic Function with Conditional Statement A special solution using symbolic functions: |

2017-07-18 10:55:22 -0500 | commented answer | Submatrix of a given matrix by deleting some rows and columns(For my case 2 rows and columns). A live example with nested for loops: http://sagecell.sagemath.org/?q=dzgfjy |

2017-06-28 10:58:32 -0500 | answered a question | Animate rotating polytope To get the rotation axis stay constant, add an enveloping circle making this invisible with |

2017-06-26 08:03:03 -0500 | answered a question | about solve() 2 equations Answer to the second question:
You have to refer to an equation in the list: |

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2017-06-21 03:46:43 -0500 | answered a question | How to simplify 1-cos(u)^2. There are far more simplify methods. See also: "simplify_full()", "simplify_trig()", "simplify_rational()", "simplify_rectform()", "simplify_factorial()", "simplify_log()", "simplify_real()", "simplify_hypergeometric()", "canonicalize_radical()" In this case |

2017-06-20 03:14:07 -0500 | answered a question | to_poly_solve problem? If |

2017-06-12 04:38:27 -0500 | answered a question | Help with unstable code The error "list index out of range" occurs if solve returns an empty list.
You can capture this exception with a |

2017-06-04 04:12:17 -0500 | answered a question | sage thinks a float is a string This works for me: |

2017-06-02 17:55:52 -0500 | commented question | a problem with variables in real domains I am afraid you are not wrong.
If we set |

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2017-05-29 11:00:03 -0500 | commented question | Transparency option in streamline plot You can use PIL to blend two images with alpha option. See an example here |

2017-05-28 02:33:39 -0500 | commented answer | Periodic function Sorry for my misunderstanding. I ignored the 'even' because the function you provided isn't even. The easiest way to build a periodic function is to start with a periodic function. The start interval depends on the function you use and therefore we may need axis transformations to get the desired result. One more suggestion: |

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2017-05-26 15:39:21 -0500 | commented answer | Periodic function Thanks for the hint. I tried to improve my answer. |

2017-05-26 14:35:58 -0500 | answered a question | What is the meaning of 3d graph? The function f returns |

2017-05-26 09:14:27 -0500 | answered a question | Periodic function EDITED UPDATE 2 --- a symbolic function: |

2017-05-23 02:30:40 -0500 | answered a question | elliptic curves plot I suppose the legend label entry shows up twice because there are two graphics primitives. You can split the plot and set the legend_label option only once. |

2017-05-02 18:38:37 -0500 | answered a question | simplifying an expression Knowing the outcome you can do: |

2017-05-01 12:18:14 -0500 | answered a question | Problems with sage solve. |

2017-04-24 10:47:19 -0500 | answered a question | How to create a Matrix with real numbers? Output: That means your matrix can contain only Integers. What you want is a matrix over the Symbolic Ring: Alternatively a matrix over a Real Field: |

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