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NDSolve with (compiled) numerical functions

• To: mathgroup at smc.vnet.net
• Subject: [mg77925] NDSolve with (compiled) numerical functions
• From: stefan.floerchinger at web.de
• Date: Wed, 20 Jun 2007 05:23:22 -0400 (EDT)

Dear Newsgroup

Is it possible to solve (ordinary, first order, coupled) Differential
equations numericaly with NDSolve, if the "right hand side" of the
equation is given as a numerical, compiled function? To be concrete,
my equations have the form

x'[t] == beta_x[ t, x[t], y[t], z[t], ...]
y'[t] == beta_y[ t, x[t], y[t], z[t], ...]
z'[t] == beta_z[ t, x[t], y[t], z[t], ...]
...

The functions beta_x, beta_y etc. are very complicated objects. I
would like to compile them in advance or perhaps use mathlink to
evaluate them externally.

Best regards
Stefan