splot-error: cannot contour non grid data!
Roger Zimmermann
Hi all,
I try to plot data on a rectangular grid (spacing 40) with the 'splot'
function
as isolines. The data looks like:
0 0 3.5
0 40 2.2
40 0 2.0
40 40 3.1 etc.
I always get:
Notice: cannot contour non grid data!
Although I really looked through the FAQ's/Manual/NG I cannot see what I
am
doing wrong: Should this data be prepared in a special way or format ?
THNX in advance, Roger
If of Interest:
gnuplot: Linux version 3.5 (pre 3.6) patchlevel beta 335
--
Dr. Roger Zimmermann *** Elektro- & Magnetophysiologie, Berlin Buch
Wiltbergstra/3e 50 D - 13125 Berlin Tel.: /30 9417 2427
----------------------------------------- Fax.: /30 9417 2466
via E-mail: zimme...@fvk-berlin.de, r...@berlin.snafu.de
-=-=-=-=- The quick brown fox jumps over the lazy dog. -=-=-=-=-
PGP-ID: Roger Zimmermann <r...@berlin.snafu.de>
Key fingerprint = 83 16 D1 82 06 71 16 60 6F 61 95 65 BB CA 02 E0
crawford richard
In message-Id: <357EF56D...@berlin.snafu.de>
Roger Zimmermann <r...@berlin.snafu.de> wrote:
> I try to plot data on a rectangular grid (spacing 40) with the 'splot'
> function
> as isolines. The data looks like:
>
> 0 0 3.5
> 0 40 2.2
> 40 0 2.0
> 40 40 3.1 etc.
>
> I always get:
>
> Notice: cannot contour non grid data!
>
> Although I really looked through the FAQ's/Manual/NG I cannot see what I
> am doing wrong: Should this data be prepared in a special way or format ?
Yes, it should.
In order for gnuplot to draw contours (or a mesh plot), it must see data
in "grid" form, which looks like this:
x(0,0) y(0,0) z(0,0)
x(1,0) y(1,0) z(1,0)
x(2,0) y(2,0) z(2,0)
. . .
x(N,0) y(N,0) z(N,0)
[null line -- nothing except \newline or CR]
x(0,1) y(0,1) z(0,1)
x(1,1) y(1,1) z(1,1)
x(2,1) y(2,1) z(2,1)
. . .
x(N,1) y(N,1) z(N,1)
[null line]
x(0,2) y(0,2) z(0,2)
x(1,2) y(1,2) z(1,2)
x(2,2) y(2,2) z(2,2)
. . .
x(N,2) y(N,2) z(N,2)
.. and so on. You can leave out all the x's and y's if you want, but the
nulls are crucial.
Dick Crawford, aka rccra...@lanl.gov
Roger Zimmermann
thanks for Your quick response. I think, I still not understand this
format of the data ...
Do the indices {e.g (0,1)} specify a point on the argument plane
or are they connected with the lines itself ? As far as I understand the
format, my data (from my example) should look like:
0(0,0) 0(0,0) 3.5(0,0)
0(0,1) 40(0,1) 2.2(0,1)
40(0,2) 0(0,2) 2.0(0,2)
40(0,3) 40(0,3) 3.1(0,3) etc.
(But I'm not shure)
What do You mean with 'null line' ? I my sense it would be the isoline,
were the 3rd value is =0
which is not neccessarily the case on some given points.
Cheers, Roger
-- Dr. Roger Zimmermann *** Elektro- & Magnetophysiologie, Berlin Buch Wiltbergstra/3e 50 D - 13125 Berlin Tel.: /30 9417 2427 ----------------------------------------- Fax.: /30 9417 2466 via E-mail: zimme...@fvk-berlin.de, r...@berlin.snafu.de -=-=-=-=- The quick brown fox jumps over the lazy dog. -=-=-=-=- PGP-ID: Roger Zimmermann