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Re: Locate an underflow [message #25210 is a reply to message #25132]

Wed, 23 May 2001 14:01

thompson
Messages: 584
Registered: August 1991

Senior Member

Paul van Delst <paul.vandelst@noaa.gov> writes:

> ... If, on running said code, I get a crapload of underflow errors, it's an
> indication that that either a) the code hasn't been tested very well or b) the
> programmer didn't really think about the problem enough ...

I disagree. It's exceedingly easy to get underflow errors, and extremely
difficult to program around them. For example, a simple Gaussian

Y = A*exp(-((X-X0)/Sig)^2)

is almost guaranteed to generate underflow errors. At some point this is going
to be indistinguishable from zero. You'd have to jump through hoops to avoid
getting the completely useless underfloat messages.

William Thompson

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[Message index]

		Locate an underflow By: francesco.spada on Tue, 22 May 2001 14:59
		Re: Locate an underflow By: George N. White III on Fri, 25 May 2001 05:08
		Re: Locate an underflow By: thompson on Thu, 24 May 2001 08:42
		Re: Locate an underflow By: Paul van Delst on Thu, 24 May 2001 07:21
		Re: Locate an underflow By: Paul van Delst on Thu, 24 May 2001 07:36
		Re: Locate an underflow By: thompson on Wed, 23 May 2001 14:13
		Re: Locate an underflow By: thompson on Wed, 23 May 2001 14:01
		Re: Locate an underflow By: Craig Markwardt on Wed, 23 May 2001 11:25
		Re: Locate an underflow By: Paul van Delst on Wed, 23 May 2001 09:59
		Re: Locate an underflow By: davidf on Wed, 23 May 2001 08:16

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