| Re: 3d plot help? [message #16800] |
Tue, 17 August 1999 00:00 |
Eric Vella
Messages: 8
Registered: April 1999
|
Junior Member |
|
|
I have used this type of plot in other programs, where it was called a
"lego" plot. Sure enough, IDL's Surface plot has a LEGO keyword. You might
try it.
Peter Clinch wrote:
> I have a 3d data set I want to graph, but the manuals are going in one
> eye and out the other after a day's programming to actually get the data
> in the first place... any help would thus be appreciated!
>
> The basic data consists of discrete points which will plot somewhere in
> a circular field to show where each point goes. The value of the data
> will be represented by a vertical bar, so in dodgy ASCII art, summat
> like this...
>
> |a
> | / |c
> | / |
> x ________/_________
> /
> /
> / |b
> y
>
> so point a is value 3 in the -ve x, +ve y quadrant, b is value 1 in the
> +ve x, -ve y quadrant, point c is value 2 in the x,y +ve quadrant, and
> so on.
>
> The points are discrete, so surface/contour plotting isn't applicable.
> Any pointers? (sorry if, as usual, I'm overlooking the staggeringly
> obvious...).
>
> thanks, Pete.
> --
> Peter Clinch University of Dundee
> Tel 44 1382 660111 ext. 33637 Medical Physics, Ninewells Hospital
> Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
> net p.j.clinch@dundee.ac.uk http://www.dundee.ac.uk/~pjclinch/
|
|
|
|
| Re: 3d plot help? [message #16802 is a reply to message #16800] |
Tue, 17 August 1999 00:00  |
davidf
Messages: 2866
Registered: September 1996
|
Senior Member |
|
|
Peter Clinch (p.j.clinch@dundee.ac.uk) writes:
> I have a 3d data set I want to graph, but the manuals are going in one
> eye and out the other after a day's programming to actually get the data
> in the first place... any help would thus be appreciated!
>
> The basic data consists of discrete points which will plot somewhere in
> a circular field to show where each point goes. The value of the data
> will be represented by a vertical bar, so in dodgy ASCII art, summat
> like this...
>
> |a
> | / |c
> | / |
> x ________/_________
> /
> /
> / |b
> y
>
> so point a is value 3 in the -ve x, +ve y quadrant, b is value 1 in the
> +ve x, -ve y quadrant, point c is value 2 in the x,y +ve quadrant, and
> so on.
>
> The points are discrete, so surface/contour plotting isn't applicable.
> Any pointers?
I think you want something like a 3D scatterplot with
the axes going through the origin. You can probably
figure it out faster than I can write it from these
two articles:
http://www.dfanning.com/tips/scatter3d.html
http://www.dfanning.com/tips/surface_axes_origin.html
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
|
|
|
|
| Re: 3d plot help? [message #16804 is a reply to message #16800] |
Tue, 17 August 1999 00:00 |
Struan Gray
Messages: 178
Registered: December 1995
|
Senior Member |
|
|
Peter Clinch, p.j.clinch@dundee.ac.uk writes:
> The points are discrete, so surface/contour plotting
> isn't applicable. Any pointers? (sorry if, as usual,
> I'm overlooking the staggeringly obvious...).
Draw the lines yourself. :-)
In direct graphics use PLOTS, which must have seemed like a
staggeringly obvious name to someone somewhere. In object graphics a
single IDLgrPolyline object will do the trick if you set up the
connectivity array (POLYLINES) correctly.
I reckon you owe me a walking pole.
Struan
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
