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2014-07-27 01:53:51 -0500 | commented question | !f2py not working I provided further clarification to my question. |

2014-07-26 13:03:48 -0500 | asked a question | !f2py not working Why is the command line F2PY tool not working with my sage installation? The command Do I have to be in the right folder for the tool to work? I run sage in a virtual machine under Windows 7. |

2014-07-26 06:34:05 -0500 | commented answer | Summing polynomials Sorry if that wasn't clear. I understood N to be a finite integer. |

2014-07-26 04:00:15 -0500 | asked a question | Summing polynomials I have a ´Univariate Polynomial Ring in t over Symbolic Ring´ How can I compute the sum over j from 1 to N? doesn't work. (Python syntax) doesn't work either. |

2014-07-26 01:41:39 -0500 | commented answer | Convert symbolic expressions like sqrt(2) or exp(1) to rational numbers I'll maybe post a separate question for the precision issue. Thank you for your answer. |

2014-07-25 14:37:55 -0500 | commented answer | Convert symbolic expressions like sqrt(2) or exp(1) to rational numbers That sounds good. Is there an advantage in the additional step to working over a field of real numbers? What if I wanted to invert a power series with those coefficients, are rational coeffients better than real numbers? |

2014-07-25 14:37:05 -0500 | answered a question | Convert symbolic expressions like sqrt(2) or exp(1) to rational numbers That sounds good. Is there an advantage in the additional step to working over a field of real numbers? What if I wanted to invert a power series with those coefficients, are rational coeffients better than real numbers? |

2014-07-25 12:35:04 -0500 | asked a question | Convert symbolic expressions like sqrt(2) or exp(1) to rational numbers I have coefficents of a rational polynomial f(x) in terms of symbolic expressions like How can I convert these coefficients to rational number approximations of them, so that I can work in a structure like a polynomial ring? |

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2014-07-23 13:38:52 -0500 | commented answer | Series Reversion Thanks a lot for your help. I think I got the hang of it. |

2014-07-22 14:48:39 -0500 | answered a question | Series Reversion My problem now is how to avoid using the Symbolic Ring. I'm trying to do the following: I want to invert an approximation formula for the Gamma-function. I am using Spouge's approximation. It has terms in the numerator and the denominator. Ithink I can compute them separetely per se, but what if I wanted to do a Pade approximation of the function (it's the term ahead of the sum term in Spouge's approimation) How do I get separate polynomials for the numerator and the denominator that are defined in the right algebraic structure? |

2014-07-21 14:50:23 -0500 | commented question | Series Reversion see above for the instructions |

2014-07-20 09:43:13 -0500 | commented question | Series Reversion I added a line with what y(x) looks like. |

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2014-07-20 08:46:18 -0500 | commented answer | Series Reversion `y(x).power_series(SR)` gives `TypeError: denominator must be a unit' |

2014-07-20 05:43:52 -0500 | asked a question | Series Reversion I have a rational polynomial f(z) = P(z)/Q(z) which I want to revert (I'm trying to find the inverse of f). I'll pick a simple example, the function f(z) = (1/z-1)^4 A power series P(z) is not a rational function P(z)/Q(z). That's why the Is it possible that Sage cannot invert rational polynomials? In the Sage help text the computation is passed to pari first, before using Lagrangian inversion. I thought Sage uses FLINT. Why is it not used for computing the inverse of rational polynomials? EDIT (after answer by slelievre): My problem now is how to avoid using the Symbolic Ring. I'm trying to do the following: I want to invert an approximation formula for the Gamma-function. I am using Spouge's approximation. It has terms in the numerator and the denominator. Ithink I can compute them separetely per se, but what if I wanted to do a Pade approximation of the function (it's the term ahead of the sum term in Spouge's approximation) How do I get separate polynomials for the numerator and the denominator that are defined in the right algebraic structure? |

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