2019-06-05 06:32:00 -0500 | received badge | ● Popular Question (source) |

2018-01-15 15:44:03 -0500 | commented answer | Finding extrema and zeros in lists Both of your solutions are very helpful! Thanks much! |

2018-01-15 15:41:22 -0500 | commented answer | Finding extrema and zeros in lists Thanks very much!! |

2018-01-11 12:08:33 -0500 | received badge | ● Editor (source) |

2018-01-11 12:07:44 -0500 | 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 -0500 | 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 |

2018-01-10 22:25:20 -0500 | received badge | ● Scholar (source) |

2017-12-30 21:13:14 -0500 | 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 -0500 | received badge | ● Student (source) |

2017-12-29 18:10:40 -0500 | 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 -0500 | 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 -0500 | 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 -0500 | 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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