Memory and NDSolve

*To*: mathgroup at smc.vnet.net*Subject*: [mg85351] Memory and NDSolve*From*: PV <prasanna.phys at gmail.com>*Date*: Thu, 7 Feb 2008 04:42:55 -0500 (EST)

Hello All, This is a general question that has reared up its head following my earlier question and discussion, (for the interested:: http://groups.google.ca/group/comp.soft-sys.math.mathematica/browse_thread/thread/be4cfdb2c357400b?hl=en#b3d4099a15314475) I have a large matrix (1920*1920), simple first order differential equation that I try to solve using NDSolve. I need the value of the solution at just one point. The Interpolating Function object generated by NDSolve progressively becomes messier and larger crashing my code for the lack of memory. I have tried to free the memory occupied by the solution but that does not happen at all. Is there a better way to circumvent this problem? Cheers Prasanna PS: I remember Mr.Jens Kuska having replied to a similar post long ago with a Runge-Kutta integrator that evaluates the soln at just one point. I downloaded that but that does not seem to work with Matrix DEs since it may have been written for an older Mathematica version!