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Re: plot (x,y,z) triplets as a surface? [message #17648 is a reply to message #17584]

Thu, 04 November 1999 00:00

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

David Fanning <davidf@dfanning.com> wrote in message
news:MPG.128a0f352e8e5f8e989937@news.frii.com...
> Andrew (noymer@my-deja.com) writes:
>
>> ...The x,y values ARE evenly
>> spaced but I would STILL like to output the data as triplets. Call
>> me stubborn.
>>
>> Is there any way to read (x,y,z) triplets into IDL and make a
>> surface? Sorry if this is a terrible newbie question.
>
> I've been meaning to write an article about gridding
> data for a SURFACE plot for about 5 years now. This
> question finally pushed me over the edge. You can find
> it here:
>
> http://www.dfanning.com/tips/grid_surface.html

David--That's a very useful article, but Andrew's original post said that
the data ARE evenly spaced.

Andrew--As I understand it you want to read in a series of (x,y,z) triplets
which actually represent vertices in a m x n rectangular array, i.e.
something like this (for m=2, n=3)

0 0 [Z value]
0 1 [Z value]
0 2 [Z value]
1 0 [Z value]
1 1 [Z value]
1 2 [Z value]

and you want to reorganise the data into an X vector (dimensioned [m]), a Y
vector (dimensioned [n]) and a Z array (dimensioned [m,n]) and generate a
surface plot. Can you confirm that this is the problem you are trying to
solve, and indicate which part you are having difficulty with. Is it reading
the data from the file or recovering X, Y and Z? Do you know m and n in
advance? Can you control the order in which the data are written into the
file?

Cheers...

---
Mark Hadfield
m.hadfield@niwa.cri.nz http://katipo.niwa.cri.nz/~hadfield/
National Institute for Water and Atmospheric Research
PO Box 14-901, Wellington, New Zealand

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[Message index]

		plot (x,y,z) triplets as a surface? By: noymer on Tue, 02 November 1999 00:00
		Re: plot (x,y,z) triplets as a surface? By: Mirko Vukovic on Thu, 04 November 1999 00:00
		Re: plot (x,y,z) triplets as a surface? By: noymer on Thu, 04 November 1999 00:00
		Re: plot (x,y,z) triplets as a surface? By: Mark Hadfield on Thu, 04 November 1999 00:00
		Re: plot (x,y,z) triplets as a surface? By: Mark Hadfield on Thu, 04 November 1999 00:00
		Re: plot (x,y,z) triplets as a surface? By: davidf on Wed, 03 November 1999 00:00
		Re: plot (x,y,z) triplets as a surface? By: davidf on Wed, 03 November 1999 00:00
		Re: plot (x,y,z) triplets as a surface? By: davidf on Wed, 03 November 1999 00:00

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