| IDLgrPlot [message #17616] |
Mon, 01 November 1999 00:00  |
Pavel Romashkin
Messages: 166
Registered: April 1999
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Senior Member |
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Hi,
I have a question.
I placed the X and Y vectors into IDLgrPlot. Vectors contain NANs. I set
xrange and yrange of both axes to the min and max of the X and Y
vectors, and displaying goes just fine. Then I retrieve the data using
obj_instance -> getProperty, DATA=data, xrange=x_range, yrange=y_range.
I noticed that min(data[0, *], /nan) equals 0 while x_range[0] does not,
it sure is the same I set it when the plot was first made. Is this a
feature or what? It looks like DATA keyword does can't return NANs. Am I
missing a /nan keyword to something?
Thank you,
Pavel
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| Re: IDLgrPlot [message #17670 is a reply to message #17616] |
Wed, 03 November 1999 00:00  |
m218003
Messages: 56
Registered: August 1999
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Member |
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In article <MPG.12895ae76a6d2e0a989935@news.frii.com>,
davidf@dfanning.com (David Fanning) writes:
> Pavel Romashkin (promashkin@cmdl.noaa.gov) writes:
>
> I mean, really,
> shouldn't you *know* what the independent data is?
> Shouldn't it *always* be defined? How else would
> you plot anything? On the other hand, I find nothing
> strange about the dependent data having numbers that
> are occasionally unknown. It wouldn't be a real
> experiment otherwise.
>
... but you can wish to plot two dependent variables versus each other.
Example: a time series of carbon monoxide and ozone was measured and you
want to find out if the two correlate. It can become even worse: in the
example of ozone sondes your independent axis is certainly the y axis
(these things fly vertically!).
Let's put it this way: we wouldn't need something as powerful as IDL
if it was always dependent y versus independent x.
Cheers,
Martin
--
[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[
[[ Dr. Martin Schultz Max-Planck-Institut fuer Meteorologie [[
[[ Bundesstr. 55, 20146 Hamburg [[
[[ phone: +49 40 41173-308 [[
[[ fax: +49 40 41173-298 [[
[[ martin.schultz@dkrz.de [[
[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[
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| Re: IDLgrPlot [message #17676 is a reply to message #17616] |
Tue, 02 November 1999 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Pavel Romashkin (promashkin@cmdl.noaa.gov) writes:
> Try the following. I realized that I had no NANs in the X-vector, that's
> why I never saw the warning message you get. However, that warning
> message does not stop you from obtaining the right object, just annoys
> you. In the example below, you can generate the data with or without
> NANs in the X-vector. You get the plot regardless. And, as long as you
> have NANs in Y, you will have 0 in data[0,*].
I notice that NANs work correctly if they are part of the
dependent data, and are set to zero if part of the
independent data. While I guess you could make a case
to RSI that this is a bug, I find it really sort of
makes a little bit of sense to me, in the kind of
way that I find hard to explain. I mean, really,
shouldn't you *know* what the independent data is?
Shouldn't it *always* be defined? How else would
you plot anything? On the other hand, I find nothing
strange about the dependent data having numbers that
are occasionally unknown. It wouldn't be a real
experiment otherwise.
Sorry, but I'm approaching senility. :-(
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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