| Please help with color contour [message #2907] |
Wed, 12 October 1994 18:56  |
zdng
Messages: 1
Registered: October 1994
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Junior Member |
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Hi, there
Could some one help me on the color contour. I used the following
command to plot the color contour with contour levels, but PV-wave
tells me that
% POLYCONTOUR: Warning: Unclosed contour ignored.
What this means?
LABELS = [1,1,1,1,1,1,1,1,1,1,1,1]
INTERVALS=[1.,3.,5.,7.,9.,11.,13.,15.,18.,21.]*1E1
contour,/spline, P,X,Y,$
c_label=labels, levels=intervals,$
PATH_FILENAME='cpaths.dat',$
xstyle=1,ystyle=1,xrange=[0,10],yrange=[0,20]
POLYCONTOUR, 'cpaths.dat', color_index = sci
contour,/spline, P,X,Y,$
c_label=labels, levels=intervals,$
PATH_FILENAME='cpaths.dat', $
xstyle=1,ystyle=1,xrange=[0,10],yrange=[0,20],/noerase
Thank you.
John Z. Ding
zdng@troi.cc.rochester.edu
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| Re: Please help with color contour [message #2972 is a reply to message #2907] |
Tue, 18 October 1994 12:53  |
landers
Messages: 45
Registered: May 1993
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Member |
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In article <1994Oct13.015610.24061@galileo.cc.rochester.edu>, zdng@laforge.cc.rochester.edu (Zhong Ding) writes:
[snip]
|>
|> % POLYCONTOUR: Warning: Unclosed contour ignored.
|>
[snip]
As has been mentioned already, you need to pad your data with a 'border' of at
least one cell on each side, to force the contours to close (an open contour
is one that disappears off the edge of the plot, and does not enscribe a
complete closed path). I prefer to pad with 2 cells on each side and do some
interpolation stuff so that the closure of the contours doesn't look so
strange (move the closure away from the real data a bit more).
However, be careful of POLYCONTOUR. I have noticed that it's not too smart at
arranging the contours. If you have a local maxima inside a larger minima,
it'll get lost (blotted out).
If you can, it's better to use something based on TV to make an image of
your data, and then overlay contours on that. Check out IMAGE_CONT.
;Dave
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| Re: Please help with color contour [message #2997 is a reply to message #2907] |
Thu, 13 October 1994 06:31 |
andy
Messages: 31
Registered: November 1993
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Member |
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In article <1994Oct13.015610.24061@galileo.cc.rochester.edu>, zdng@laforge.cc.rochester.edu (Zhong Ding) writes:
> Hi, there
>
> Could some one help me on the color contour. I used the following
> command to plot the color contour with contour levels, but PV-wave
> tells me that
>
> % POLYCONTOUR: Warning: Unclosed contour ignored.
>
> What this means?
>
I remember back in the old days (when I was programming in the old country)
that one was encouraged to specifically close all contours around the
boundary of one's data. If one had a 5x5 array with x and y axes ranging
from 1 to 5 one would create a 7x7 array, place the 5x5 array in the middle,
assign a value of 1.e-30 to values along the outer rows and columns of the
new array, assign values of .9999, 1, 2, 3, 4, 5, 5.0001 to xnew, ynew,
then contour the new array over xnew, ynew.
We don't do this anymore since IDL (by RSI) has added some useful keywords
like /close, /fill, and now /cell.
--
,__o Andrew F. Loughe (Mail Code 971) voice: (301) 286-5899
-\_<, NASA Goddard Space Flight Center fax : (301) 286-0240
(*)/'(*) Greenbelt, MD 20771 email: andy.loughe@gsfc.nasa.gov
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