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MathGroup Archive 2005

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Maintenance of precision in NIntegrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60504] Maintenance of precision in NIntegrate
  • From: "Alan" <info at optioncity.REMOVETHIS.net>
  • Date: Sun, 18 Sep 2005 01:16:00 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Consider integrating a function arg[] with a stated PrecisionGoal, say 10:

NIntegrate[arg[x], PrecisionGoal->10, ...]

The integrand arg[x] is a numerical function of the form:

arg[x] := (bunch of elementary functions) + NIntegrate[arg2[y],...]

arg2[y] is, at best, computable to MachinePrecision.

However, I don't know the best choices for
PrecisionGoal or related options for the second integral (the inside 
integral)
in order to minimize my computation runtime. So, let's assume I do not use
these options at all in the inside integral.

My question: will Mathematica then automatically request the inside
integral to perform at a high enough PrecisionGoal in order to
meet my PrecisionGoal target of 10 in the first (outside) integral?

Thanks,
alan

 



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