       Re: Table Format Problem

• To: mathgroup at smc.vnet.net
• Subject: [mg98424] Re: Table Format Problem
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Thu, 9 Apr 2009 05:57:04 -0400 (EDT)
• Organization: Uni Leipzig
• References: <grhp6r\$mh1\$1@smc.vnet.net>

Hi,

A = Table[
Join @@ Table[({R1[t], P1[t]} /. sol[J][]), {J, 1, 5, 1}], {t,
100, T, 1}];

?

Regards
Jens

Solver wrote:
> Hello,
>
> I would like to export the results of an NDSolve simulation but I can
> not seem to figure out how to export my data in the format I want.
> Here is a simplified version of my code. I have two variables: R1 and
> P1. I am solving the system from t = 100 to 110 for values of J = 1 to
> 5. I want my data to be in the following format:
> Each column is a solution to a variable for a given time (time are the
> rows). I would have 10 columns (R1[J=1], P1[J=1],R1[J=2],P1[J=2]...R1
> [J=5],P1[J=5]) and 11 rows (one for each time step). The closest I
> could get was having 2 columns (R1, P1) with the rows being solutions
> for J=1, then J=2, etc.
> Here is my code:
>
> a1=1;
> d1=.3;
> l1=.15;
> T=110;
>
> dR1=J-l1*R1[t]-a1*R1[t]*P1[t];
> dP1=a1*R1[t]*P1[t]-d1*P1[t];
>
> Flatten[Map[({R1,(P1)}/.#)&,Table[sol[J]=NDSolve[{R1'[t]
> ==dR1,P1'[t]==dP1,R1==1,P1==1},{R1,P1},{t,100,T},MaxSteps-
>> 100000],{J,1,5,1}]],1]//Transpose;
>
> A=Flatten[Table[Evaluate[({R1[t],P1[t]}/.sol[J]),{J,1,5,1}],{t,100,T,
> 1}],2];
>
> Export["Data.csv",A];
>