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MathGroup Archive 2004

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Interpolating function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49158] Interpolating function
  • From: mathma18 at hotmail.com ("G.L.Narasimham")
  • Date: Mon, 5 Jul 2004 04:54:53 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

ODE=0==y''[t]+(1-y[t])/y'[t];
NDSolve[{ODE,y[1]==1,y'[1]==1},y,{t,-2,3}];
y2[u_] =  y[u] /. First[%];
yd = Dt[y2[t],{t,1}]; ydd = Dt[y2[t],{t,2}];
Plot[ {y2[t],y3[t],yd,ydd},{t, -2, 3 }];
" Is it not possible to directly access
 y'[t]and y''[t] plots without Dt? "


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