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export differential equation solution obtained through Mathematica to

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106326] export differential equation solution obtained through Mathematica to
  • From: Yun Zhao <yun.m.zhao at gmail.com>
  • Date: Fri, 8 Jan 2010 04:17:17 -0500 (EST)

Hi everyone,

  I would like to know if there is a way to export differential equation
solution obtained through Mathematica to microsoft excel.  There are several
data processing things that I want to know, that simply plotting the
solution in Mathematica won't suffice.

  I have a system of differential equations like so:


sol3=NDSolve[{p'[t]=-0.0491*p[t]-0.0089*p[t],n'[t]=0.0491*p[t]+(0.0491-0.0089)*n[t],p[0]=25000,n[0]=0},{p,n},{t,0,100}]

When I plotted it in Mathematica using this code:

Plot[Evaluate[{n[t]+p[t]}/.First[sol3]],{t,0,100}]

I get a exponential increasing function plotting number vs. time.

What I want is the values of both the time vector and number vector, and I
want to copy and paste them into two columns in microsoft excel.

I tried using:

Export["newdata.dat", Evaluate[{n[t]+p[t]}/.First[sol3]]

But this gives me a .dat file with the time and number vectors all scrambled
up.

My question is:

(1) is there a better way to tell Mathematica what I want to export, because
I don't think Evaluate[{n[t]+p[t]}/.First[sol3] is the correct term to
convey what I want

(2) How do I properly export differential equation solutions that I can
graph but not display in Mathematica, to spreadsheets software like
Microsoft Excel?



Thank you all very much.



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