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new changes to contour under IDL Version 3.1.1 (sunos sparc) [message #1302]

Wed, 15 September 1993 17:15

sylvain
Messages: 2
Registered: September 1993

Junior Member

Despite IDL's newsletter bragging about saving someone marriage by changing
the CONTOUR routine (sic, see IDL's newsletter "spring 1993"), I get very
frustrated by the new version.

1) the userlib function MIN_CURVE_SURF is NOT equivalent to the keyword
/spline: indeed, MIN_CURVE_SURF() takes forever to process any medium size
array (ie a 40x20), while /splines will work fine, and. Adding a new userlib
function is improvement, but dropping a usefull keyword definitively isn't.

2) the /fill option is broken when trying to fill only 1 level, why so?:

IDL> lvls=[.05,.1,.2,.5,.7,9]
IDL> contour, zz, levels =lvls, xx, yy, /xsty, /ysty
IDL> contour, zz, levels =[0.5], xx, yy, /xsty, /ysty, /fill, /overplot
% Program caused arithmetic error: Integer divide by 0
% Detected at $MAIN$ (CONTOUR).

This sound to me like a bug (not a feature:).

3) why add the /dowhill keyword and not fix the contour labeling as to be
oriented in such a way as to indicates the downhill direction?

BTW, the hints in notes/sun_motif.doc to get rid of the "harmless, but
anoying" warning about osf keysyms when using the Sun-Motif 3.1.1 executable
are not working. I'm running MIT's X11r4, twm, and have OPENWINHOME defined.
Note that OPENWINHOME is NOT /usr/openwin on our machines!

--

Sylvain G. Korzennik

Harvard-Smithsonian Center for Astrophysics
Solar and Stellar Physics Division. Mail Stop 16.
60 Garden Street, Cambridge, MA 02138.

(617) 495-7451, FTS 830-7451, FAX (617) 495-7049

(sylvain@cfassp.harvard.edu Internet/Arpanet)
or
(sylvain@cfa.harvard.edu Internet/Arpanet)
(cfa::sylvain SPAN/DECnet)
(sylvain@cfa Bitnet/Earn)
(skorzennik SolarMail)

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[Message index]

		new changes to contour under IDL Version 3.1.1 (sunos sparc) By: sylvain on Wed, 15 September 1993 17:15
		Re: new changes to contour under IDL Version 3.1.1 (sunos sparc) By: turet on Mon, 04 October 1993 12:06
		Re: new changes to contour under IDL Version 3.1.1 (sunos sparc) By: thompson on Thu, 16 September 1993 09:43
		Re: new changes to contour under IDL Version 3.1.1 (sunos sparc) By: rfinch on Thu, 16 September 1993 08:53
		Re: new changes to contour under IDL Version 3.1.1 (sunos sparc) By: andy on Thu, 16 September 1993 07:48
		Re: new changes to contour under IDL Version 3.1.1 (sunos sparc) By: pat on Thu, 16 September 1993 05:24

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