I've worked around my previous problem by splitting the curve and reflecting about the line X=Y. However, I am now adding straight lines through various points, using parametric_plot with a predefined function to compute the y coordinate from the two given points and a given value for X. When I run the cell containing the parameter_plot calls, it works OK the first time, but when re- evaluated it produces an error:
TypeError: Graphics object is not callable The Notebook is getting rather long now, so I've saved it to a file: http://www.billp.org/Fermat-1729.sws I'd be grateful if someone can download and try this (I did try to login to www.sagenb.org and sage.maths.washington.edu to upload it there but neither were responding in semi-finite times.). I reloaded it and did 'Evaluate all' which worked OK, but then click on the cell with the parametric_plot calls and re-evaluate them to produce the error. Many thanks Bill --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---