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Re: Filtering out NaNs [message #8526 is a reply to message #8521]

Wed, 19 March 1997 00:00

Tim Patterson
Messages: 65
Registered: October 1995

Member

Stein Vidar Hagfors Haugan wrote:
>
> In article <Iarla-1903971745010001@eorcu4.ch.cam.ac.uk>, Iarla@atm.ch.cam.ac.uk (Iarla Kilbane-Dawe) writes:
> |> Hello,
> |>
> |> There are some NaNs in my data which keep making my code fall over. I'd
> |> like to either filter them out or avoid them in the calculation, but doing
> |> something like
> |>
> |> a(where(a eq !values.f_nan) = missing_flag
> |>
> |> doesn't work. Does anyone have any suggestions?
> |>
>
> NaNs are characterized by the fact that they are *not* equal
> to any number (that's what it says, isn't it :-)
>
> In fact, it's not even equal to itself - and this is the distinguishing
> feature that must be used to pick them out. I.e.,
>
> a(where(a ne a)) = missing_flag
>
> Stein Vidar

A thing which is not even equal to itself !

I'm not sure if I'm reading the IDL newsgroup or the Zen mystics
newsgroup...

Tim

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[Message index]

		Re: Filtering out NaNs By: Dale Bailey on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: thompson on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: peter on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: bowman on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: f055 on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: sritcey on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: bowman on Wed, 19 March 1997 00:00
		Re: Filtering out NaNs By: davidf on Wed, 19 March 1997 00:00
		Re: Filtering out NaNs By: Tim Patterson on Wed, 19 March 1997 00:00

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