is there something wrong with my program?

Im solving a ODE equation with ode15s in in space, voltage and time, with 801 nodes. How long should i expect matlab to take to solve this? Because at the moment it has been upwards of 20 minutes?

Answer 1

[Walter Roberson]

Could be hours. You might want to interrupt it and recode slightly with an options parameter that requests plotting as it goes so that you can see the progress.

[Joe Koning]

how would i specify this options parameter?

[Walter Roberson]

http://www.mathworks.com/help/matlab/ref/ode15s.html

notice the calling forms that have "options" as a parameter, and note "You can create options using the odeset function". Over at odeset, you want the "Solver Output Options" section, http://www.mathworks.com/help/matlab/ref/odeset.html#f92-1016858. You probably want 'OutputFcn', and you might want to use @odeplot as your choice. You might want to specify 'OutputSel' to be selective about what you plot.