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MathGroup Archive 1998

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Integrate vs. NIntegrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg12767] Integrate vs. NIntegrate
  • From: Andreas Kull <kull at ifa.hawaii.edu>
  • Date: Wed, 10 Jun 1998 03:04:26 -0400
  • Organization: University of Hawaii
  • Sender: owner-wri-mathgroup at wolfram.com

Hello all,

who knows how I can get ride of the following type of problem with
undefined limits in NIntegrate?

In[1]:=FindRoot[NIntegrate[y,{y,0,x}]==1,{x,0.25}] NIntegrate::"nlim":
"\!\(y\) = \!\(x\) is not a valid limit of integration."
NIntegrate::"nlim": "\!\(y\) = \!\(x\) is not a valid limit of
integration."
NIntegrate::"nlim": "\!\(y\) = \!\(x\) is not a valid limit of
integration."
General::"stop": "Further output of \!\(NIntegrate :: \"nlim\"\) will be
suppressed during this calculation." Out[1]:={x->1.41421}

It would be nice to have the above example working like Integrate, i.e.
In[2]:=FindRoot[Integrate[y,{y,0,x}]==1,{x,0.25}] Out[2]:={x->1.41421}

thanks,
Andreas





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