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2013-03-13 02:07:42 -0500 | commented question | How to treat with logarithm numerically when it becomes negative? Have you tried: find_root(log(x*x-x),-2,0) -0.6180339887498988 find_root(log(x*x-x),-2,2) 1.6180339887498947 |

2013-02-24 07:59:25 -0500 | commented answer | 3d Complex function plot http://ask.sagemath.org/question/1767/coloring-surfaces-in-plot3d |

2013-02-24 04:14:57 -0500 | answered a question | 3d Complex function plot My colouring is based on the z=f(x,y) value of the plotted function. Compare: or: |

2013-02-23 23:59:51 -0500 | answered a question | 3d Complex function plot For example: |

2013-02-23 20:48:41 -0500 | answered a question | integral interpretation Sage gives you the correct answer. You can check it for example in wolframalpha. is the exponential integral (and not a product). To obtain a better formatted code you can copy-paste your code, mark it and use the 101... icon. |

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2013-02-15 23:16:04 -0500 | answered a question | How does one find solutions to a polynomial over a finite field? |

2013-02-13 17:17:18 -0500 | commented answer | Disabling y-axes in 2-D plot O.K. I did. |

2013-02-13 08:48:47 -0500 | commented answer | Disabling y-axes in 2-D plot Try the edited version above |

2013-02-13 05:18:39 -0500 | answered a question | Disabling y-axes in 2-D plot In matplotlib you can use for example the link http://www.shocksolution.com/2011/08/... In Sage you can use a workaround: |

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2013-02-11 23:17:18 -0500 | answered a question | Extracting a matrix from linear expressions |

2013-02-05 08:21:27 -0500 | answered a question | Elliptic Curve functions don't seem to exist? Your commands are O.K.: |

2013-01-22 17:10:56 -0500 | commented answer | Unable to evaluate integral of x*x/(exp(x)+1) Zeta is by definition the sum of a series, so this approach seems to be natural. I suspect that Mathematica uses a similar approach. As far as the speed is concerned: sage: timeit('numerical_integral(x^2/(exp(x)+1),0,oo)') 625 loops, best of 3: 1.36 ms per loop |

2013-01-22 00:46:25 -0500 | commented answer | Unable to evaluate integral of x*x/(exp(x)+1) This method works for higher powers of x Wolfram alpha does not allow for x^n, n>4 |

2013-01-21 18:32:41 -0500 | answered a question | Unable to evaluate integral of x*x/(exp(x)+1) Maxima can not compute the limit but expanding into series and integrating term by term helps: |

2013-01-20 04:49:07 -0500 | commented question | simplify sinh expression sinh(log(1+sqrt(2))).n() 1.00000000000000 |

2013-01-18 21:45:05 -0500 | answered a question | Product of Elements in Group Use |

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2013-01-15 11:33:55 -0500 | edited answer | Matrices and mpmath Use mpmath operations to mpmath matrices You can also control precision in Sage: |

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