Re: Displaying missing data

• To: Paul Gifford <pgg@xxxxxxxxxxxxx>
• Subject: Re: Displaying missing data
• From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Date: Wed, 12 Jul 2000 06:57:22 -0500

Hi Paul,

>   A more accurate subject would be "Not displaying missing data".  I
> have data (a time series) which occasionally are missing values.  I am
> plotting the data as a line plot, and need to show missing points as
> discontinuities in the line (line, gap, line, gap, etc).  Should I break
> up the data into multiple sets and arrays of values?  It seems to be
> that is what I'll have to do, though I don't know what I'm doing so I
> could be wrong :)

In VisAD, individual missing values are indicated by Float.NaN
or Double.NaN in the values you pass to FlatField.setSamples, and
in the value argument to the Real constructor.  Such missing values
are depicted as invisible, including as gaps in lines when ScalarMaps
generate depictions as lines.  See Ugo's tutorial, under documentation
on the VisAD web page, for a discussion of depicting fields as lines.

> ps Has anyone considered setting up a VisAD news server?  Personally, I
> find such a configuration to be more flexible than a mailing list and
> archive....just a thought...

Its a thought.  On the other hand, the Java3D folks set up a
new group but their mailing list is still much more active than
their new group.  What are the advatages of a news group?

Cheers,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
hibbard@xxxxxxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html

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