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Re: Some sort of NULL value in IDL ? [message #20685 is a reply to message #20674]

Wed, 19 July 2000 00:00

Nando Iavarone
Messages: 48
Registered: December 1998

Member

<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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Martin Schultz wrote:
<blockquote TYPE=CITE> 
 >
 > This issue is handled in HDF Scientific Datasets by attaching standard
 > attributes to an SDS variable. The following attributes have been
 > established by the HDF and netCDF communities:
 ></blockquote>

<blockquote TYPE=CITE> 
 ... isn't there yet another standard attribute named missing_value
which
 would be even more appropriate?</blockquote>

<pre>Hi,</pre>

<pre>I don't know anything about the specific format you are using,</pre>

<pre>but when I need a 'NULL' value I use the IEEE NaN (!VALUES.F_NAN, !VALUES.D_NAN). This is valid only if your data type is float or double.</pre>

<pre>Best regards.</pre>

<pre></pre>

<pre>-- 
Nando Iavarone
Advanced Computer System - SPACE DIVISION
via Lazzaro Belli, 23
00040  Frascati - RM
Tel: +39-6-944091 (switchboard)
           9440968 (direct)
E-mail: 
    f.iavarone@acsys.it
    FrdndVrn@altavista.net</pre>
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		Some sort of NULL value in IDL ? By: deckard_007 on Fri, 14 July 2000 00:00
		Re: Some sort of NULL value in IDL ? By: Nando Iavarone on Wed, 19 July 2000 00:00
		Re: Some sort of NULL value in IDL ? By: Martin Schultz on Tue, 18 July 2000 00:00

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