I'm having issues solving a 1st order ODE.(adsbygoogle = window.adsbygoogle || []).push({});

Here what happens:

NDSolve[{y'[x]/y[x] == k *Pi* r^2* Sqrt[1 + y'[x]^2], y[0] == 136/10}, y[x], {x, 0, 30}]

NDSolve::ndnum: Encountered non-numerical value for a derivative at x == 0.

Changing the x range is no help... I get the same message for any initial point...

k and r are given parameters.

Any idea what's wrong in my code?

Thanks

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# ODE solution with Mathematica 8

Loading...

Similar Threads - solution Mathematica | Date |
---|---|

Verifying PDE solutions using Mathematica | Jun 20, 2016 |

Mathematica NDSolve different solutions same eq's | Jul 23, 2015 |

Working with numerical solutions in mathematica | Apr 8, 2015 |

Help in Mathematica code for solutions expansion of differential equations | Apr 25, 2012 |

Trouble downloading mathematica packages - probably a very quick solution | Mar 23, 2012 |

**Physics Forums - The Fusion of Science and Community**