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Re: Interesting Filled Contour Problem [message #79901 is a reply to message #79900]

Mon, 16 April 2012 20:21

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Monday, April 16, 2012 4:57:40 PM UTC-4, David Fanning wrote:
> We have a winner, and from a MOST unexpected source!
> Josh, a Technical Support Engineer at Excelis, has
> correctly identified the problem as being caused
> by NaNs in the original data set. When I do this:
>
> data = data > 0
>
> I apparently set the NaN values to zero, too.
> (Not sure this is totally kosher, but it does
> seem to work!)

Whaaa? I was under the impression that
NAN = !values.d_nan
NAN OP X
will always result in a value of NAN, for all operations OP and for all operands X. In other words, I don't think IDL's behavior is kosher.

Strangely,
NAN < 0
produces NAN, so apparently NAN is a negative number (!!!).

Craig

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[Message index]

		Re: Interesting Filled Contour Problem By: Kenneth P. Bowman on Tue, 17 April 2012 09:00
		Re: Interesting Filled Contour Problem By: Carsten Lechte on Tue, 17 April 2012 04:54
		Re: Interesting Filled Contour Problem By: David Fanning on Mon, 16 April 2012 20:51
		Re: Interesting Filled Contour Problem By: Craig Markwardt on Mon, 16 April 2012 20:21
		Re: Interesting Filled Contour Problem By: David Fanning on Mon, 16 April 2012 13:57
		Re: Interesting Filled Contour Problem By: David Fanning on Mon, 16 April 2012 12:28

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