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Re: Trouble with IDL 5.0.2 (filled contours) unsolved? [message #11079 is a reply to message #11071]

Tue, 03 March 1998 00:00

Mikael Barfred
Messages: 2
Registered: March 1998

Junior Member

Hello,

I have searched dejanews for articles in this newsgroup regarding
the filled contour problems in IDL 5.0.2. I got a handfull of
recent articles on this, indicating that I am not the only
frustrated IDL 5.0.2 user, but none of them had a solution
or even an explanation to the problem, so I will try to raise
the question again:

I have a global dataset, and two vectors holding the lon and
lat coordinates.
I plot them using:

map_set
contour, DATA, LON, LAT, nlevels=10, /cell_fill, /overplot

When plotting, it does the right thing most of the time, but
suddenly during the process, big spikes and triangles may
be drawn across the whole plot, leaving the result useless,
of course.
some times, but not always, it writes:

% Program caused arithmetic error: Floating illegal operand

after completing the plot.

I have access to both IDL v. 5.0.2 and v. 4.0.1. In the old
version, excactly the same task using excactly the same data,
produces the correct plot with no spurious spikes or triangles
messing everything up, and no error messages afterwards.

Some detailed info (which may not be relevant?):
The DATA array is 320x160 with range: -3000 to 55000 and no
undefined values. It starts from (-180, -90), as the IDL 5.0.2
contour doc. says "the X and Y arrays (if supplied) must be
arranged in increasing order" when using contour on map
projections.
The LON is a vector with 320 points, with range: -180.0 to 180.0
and the LAT is a vector with 160 points, with range: -89.14 to 89.14
The first and last columns in DATA are duplicates, as they in fact
represent the same physical locations.

This really beats me! Can it be anything but a (fullfeatured
roaring trucksize) bug?

- What do you think?

Mikael

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~
MSc Mikael Barfred | E-mail : mb@dmi.dk
Danish Meteorological Institute | Phone (work): (+45) 39 15 74 66
Met. and Oceanographic Research Div. | Fax (work): (+45) 39 15 74 60
Lyngbyvej 100 | Phone (home): (+45) 44 49 12 77
DK-2100 Copenhagen 0E, DENMARK | http://chaos.fys.dtu.dk/~mb
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~

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[Message index]

		Re: Trouble with IDL 5.0.2 (filled contours) unsolved? By: rivers on Thu, 05 March 1998 00:00
		Re: Trouble with IDL 5.0.2 (filled contours) unsolved? By: Reinhold Schaaf on Wed, 04 March 1998 00:00
		Re: Trouble with IDL 5.0.2 (filled contours) unsolved? By: hcp on Wed, 04 March 1998 00:00
		Re: Trouble with IDL 5.0.2 (filled contours) unsolved? By: Andy Loughe on Tue, 03 March 1998 00:00
		Re: Trouble with IDL 5.0.2 (filled contours) unsolved? By: davidf on Tue, 03 March 1998 00:00
		Re: Trouble with IDL 5.0.2 (filled contours) unsolved? By: Andy Loughe on Tue, 03 March 1998 00:00
		Re: Trouble with IDL 5.0.2 (filled contours) unsolved? By: Mikael Barfred on Tue, 03 March 1998 00:00
		Re: Trouble with IDL 5.0.2 (filled contours) unsolved? By: Mikael Barfred on Tue, 03 March 1998 00:00

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