Controlling output of ode solvers

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David H
David H 2016-6-13
I am currently running an ODE solver in the form
dy = @(t,y) M*y;
[tout,y_out] = ode45(dy, trange,yinit);
% y_out is a length(trange) by length(yinit) matrix
range_needed = [1:10,100:105]; %for example
y_needed = y_out(:,range_needed);
Essentially I only actually "want" a section of y_out in the non-time dimension. However doing the calculation as I wrong above will fill lots of the memory with values I don't actually need which is leading to problems.
I could use an output function to process the ODE output and only select this bit but the one I have written isn't very good. Is there any way to do what I can do this the ode45 options? Failing that is there a function anyone knows that does this on the FEX?

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