| Re: 2-D Density Plots [message #33591] |
Wed, 15 January 2003 07:38 |
David Burridge
Messages: 33
Registered: January 1998
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Member |
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Hi Justin,
"Justin Sieglaff" <justins@ssec.wisc.edu> wrote in message
news:9bc4f51c.0301131508.73b9098d@posting.google.com...
> I was wondering if anyone knows of a simple way to create 2-d density
> plots? Any help would be great!
I wrote this really cool, fast routine to do this (by mapping byte values
from two imagesinto the upper and lower half of a short integer) then
discovered HIST_2D which does the same:-(
Cheers,
Dave
--
David Burridge
Burridge Computing, 18 The Green South
Warborough, Oxon, OX10 7DN
England
Tel: +44 (0) 1865 858279, Email: davidb@burridgecomputing.co.uk
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| Re: 2-D Density Plots [message #33623 is a reply to message #33591] |
Mon, 13 January 2003 16:46  |
Mark Hadfield
Messages: 783
Registered: May 1995
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Senior Member |
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"Justin Sieglaff" <justins@ssec.wisc.edu> wrote in message
news:9bc4f51c.0301131508.73b9098d@posting.google.com...
> I was wondering if anyone knows of a simple way to create 2-d density
> plots? Any help would be great!
What do you mean by "2D density plot". Do you mean a plot that displays 2D
numeric data as a 2D array of cells, with the colour of each cell
representing the corresponding numeric value via a number->color mapping?
Plots like these tend to be loosely called "image plots" in the IDL
community. Matlab refers to them as pseudo-color plots. In the Mathematica
documentation they're referred to as density plots. And this is the term
that I have tended to use.
There is a lot of IDL software out there to plot density plots (in this
sense)
Have a look at David Fanning's XIMAGE at
http://www.dfanning.com/
Craig Markwardt's PLOTIMAGE at
http://astrog.physics.wisc.edu/~craigm/idl/idl.html
Liam Gumley's IMDISP at
http://www.gumley.com/PIP/Free_Software.html
I have tried several ways of implementing density plots in object graphics
in my Motley IDL library:
ftp://ftp.niwa.co.nz/incoming/m.hadfield/idl/README.html
See the MGH_Density class & the MGH_EXAMPLE_DENSITY example program.
--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)
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