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MathGroup Archive 2007

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Problem with combination NDSolve NIntegrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72739] Problem with combination NDSolve NIntegrate
  • From: Paul Schneider <paul.schneider at wu-wien.ac.at>
  • Date: Wed, 17 Jan 2007 06:44:44 -0500 (EST)


I am using version 5.2



NIntegrate tries to evaluate the integrand symbolically. I try to 

circumvent this by using ?NumberQ but without success. Please try the 

following toy example:



trial[a_?NumberQ] :=

     NDSolve[{ti'[t] == ti[t] , ti[0] == a} , ti, {t, 0, 10}];

NIntegrate[ (ti[5] /. trial[a]), {a, 0, 10}]

Plot[ (ti[5] /. trial[a]), {a, 0, 10}]



NIntegrate does not evaluate to a number and throws a warning, while I 

get a perfect plot from Plot.



Does anybody know what to do?



Cheers,



Paul



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