is there something wrong with my program?

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Joe Koning
Joe Koning 2013-4-26
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?

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Walter Roberson
Walter Roberson 2013-4-26
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.
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Joe Koning
Joe Koning 2013-4-26
how would i specify this options parameter?
Walter Roberson
Walter Roberson 2013-4-26
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.

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