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2019-09-07 19:15:09 -0600 | asked a question | solving simultaneous equations with solve() I am trying to solve a set of (fairly simple) nonlinear simultaneous algebraic equations with real solutions as shown below. I know the equations have real solutions (they are in the comment line), but I cannot get sage to produce them. If I remove the 'sympy' and 'real' it produces complex solutions. Is there a better method for solving equations like these? |

2019-09-02 11:36:40 -0600 | answered a question | getting a float result from solve Sorry, I tried to attach an image of it and I messed it up. Here is the code: a,b=var('a b') solve([7.0==a print a.n() The result the solve command gives is the ratios of integers. (I typed an asterisk between the a and the sqrt, but it doesn't show up...) |

2019-09-02 10:24:12 -0600 | asked a question | getting a float result from solve I am trying to solve a system of 2eqs, and sage keeps giving me integer results. When I try to print a.n() I get an error cannot evaluate symbolic expression numerically. Sorry, I tried to attach an image of it and I messed it up. Here is the code: The result the solve command gives is the ratios of integers. (I typed an asterisk between the a and the sqrt, but it doesn't show up...) |

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2018-01-15 15:44:03 -0600 | commented answer | Finding extrema and zeros in lists Both of your solutions are very helpful! Thanks much! |

2018-01-15 15:41:22 -0600 | commented answer | Finding extrema and zeros in lists Thanks very much!! |

2018-01-11 12:08:33 -0600 | received badge | ● Editor (source) |

2018-01-11 12:07:44 -0600 | answered a question | Finding extrema and zeros in lists OK, I think I have a path to a solution. I have changed the differential equation so that it has zeros and this code prints the values on either side of where the function crosses zero. I can do something similar for the extrema. So I guess I am now asking if there is a function call that does this, or if there is a smarter way. Thanks, Wayne |

2018-01-11 06:27:25 -0600 | asked a question | Finding extrema and zeros in lists I create a list Q (below) of pairs of numbers [t1,z1], I want the pairs (maybe just a print of them?) at the local extrema (of z1) and where z1 crosses zero. Is there a simple way to do this? Thanks, Wayne |

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2017-12-30 21:13:14 -0600 | commented answer | solving nonlinear second order ordinary differential equations numerically Thanks very much Calc314! Clearly I have a lot to learn. I will work on this. |

2017-12-29 23:11:00 -0600 | received badge | ● Student (source) |

2017-12-29 18:10:40 -0600 | answered a question | solving nonlinear second order ordinary differential equations numerically Thanks Eric, I meant the g(t) term to be a y(t) term so the equation looks like y''(t)+f(t)(y'(t))^2 +y(t)=0 I don't think this is easily turned into a first order equation. Wayne |

2017-12-29 13:34:21 -0600 | answered a question | numerical solutions to second order nonlinear differential equations Oops, I should have had a y(t) term in there, e.g. y''(t)+f(t)(y'(t))^2+y(t)=0 |

2017-12-29 11:12:21 -0600 | asked a question | numerical solutions to second order nonlinear differential equations Are there any Sage tools that will numerically solve equations of, for example, this form: y''(t)+f(t)(y'(t))^2+g(t)=0 (where the derivatives are with respect to t)? Thanks, Wayne |

2017-12-29 11:12:21 -0600 | asked a question | solving nonlinear second order ordinary differential equations numerically Are there any Sage tools that will numerically solve equations of, for example, this form: y''(t)+f(t)(y'(t))^2+g(t)=0 (where the derivatives are with respect to t)? Thanks, Wayne |

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