# User Portlet

Discussions |
---|

Sean, Sander, Many thanks for the helpful feedback. I will certainly take a look at the video. Cheers, David |

Thomas try n++; instead of n:=n+1; This yields 1 2 2 3 3 4 4 5 5 6 |

Actually it turned out that the run went with tfr =5 and n=64. The calculation stopped at t=10.6719s. Are the .pdf files of any interest to you? |

I am trying to calculate the electric field potential above a charged, insulating, disc. The simple version has the potential evaluated along the y-axis if the disc lies in the x-z plane and centred at the origin. In polar coordinates the integral is... |

Hi I am looking at some simple electricity and magnetism problems and want to use various tools to look at the electrostatic vector field. In my attached (M10) notebook I try to use ListStreamPlot and ListVectorPlot as alternatives to do this. I can... |

Thank you John. I |

David, Many thanks for your reply. I will change the number of {xi,yi} {vxi,vyi} pairs and add the VectorPoints option as you suggest. OK. Did that and it seems to be working-the inline help could be a little more explicit in future releases... |

The definitive answer to this can only come from the Wolfram licensing folk. I suspect that the real legal bind in the Home Version use license is how Mathematica is exploited. I have actually read right through my own home user license agreement and... |

Hi, I am trying to learn how to use the EquationTrekker package inside Mathematica 10.0.02. As soon as I try and run even the simple example from the documentation centre, I just get a some very strange error messages. I have attached the example... |

Could you include the system of equations you are trying to solve? In some recent work, I have had 'stiffness' warning messages from NDSolve for certain sets of input parameters when the same set of equations solve perfectly well under different... |