NDSolve Problems for evaluating specific values

*To*: mathgroup at smc.vnet.net*Subject*: [mg12756] NDSolve Problems for evaluating specific values*From*: "David Grymonpré" <grymonpr at wombat.eng.fsu.edu>*Date*: Wed, 10 Jun 1998 03:04:16 -0400*Organization*: Florida State University*Sender*: owner-wri-mathgroup at wolfram.com

I am solving a set of 17 non-linear ODE's to solve a reaction-diffusion problem involving 27 chemical reactions. I am using the NDSolve command to perform the numerical calculation. This gives me the results in the following form: {{y1[t]InterpolatingFunction[{{0.,900.}},<>][t], ... y17[t]InterpolatingFunction[{{0.,900.}},<>][t], These results give me the results I am looking for when I use the plot function to evaluate them. The other result I need is to obtain the solution to each equation for specific values of time. The command given for this in the help documentation is the following: y1[60.] /. %122 where 122 is the line number of the resulting InterpolatingFunctions. This returns the output of {y1[60.]} and not the numerical value I am looking for. The example provided for this command line is for a solution to one ODE. Is there anything I need to do differently because I have 17 solutions? David