| Re: Help with vert_colors and rgb_table [message #82957] |
Tue, 29 January 2013 09:56 |
justinclouds
Messages: 25
Registered: December 2012
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Junior Member |
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On Tuesday, January 29, 2013 10:19:27 AM UTC-7, Mark Piper wrote:
> On Monday, January 28, 2013 10:33:20 AM UTC-7, justinclouds wrote:
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>>
>
>> What I need is to be able to show the color scale in the plot area to give an indication of the scale on the z values. Also, can the color range in z values be controlled?
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>>
>
>
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> There are a few ways to handle this. If you have IDL 8.2, here's one:
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> x = 2*!pi*findgen(50)/49
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> y = sin(x)*cos(2*x)
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> z = round(randomu(1, 50)*100)
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> p = plot(x, y, 'o', $
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> /sym_filled, $
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> vert_colors=bytscl(z), $
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> rgb_table=39)
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> cb = colorbar(rgb_table=39, $
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> range=[0,100], $
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> position=[0.50, 0.20, 0.90, 0.23])
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> Note that I bytescaled the Z values.
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>
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> mp
That's what I needed. Thanks!
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| Re: Help with vert_colors and rgb_table [message #82958 is a reply to message #82957] |
Tue, 29 January 2013 09:19  |
Mark Piper
Messages: 198
Registered: December 2009
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Senior Member |
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On Monday, January 28, 2013 10:33:20 AM UTC-7, justinclouds wrote:
>
> What I need is to be able to show the color scale in the plot area to give an indication of the scale on the z values. Also, can the color range in z values be controlled?
>
There are a few ways to handle this. If you have IDL 8.2, here's one:
x = 2*!pi*findgen(50)/49
y = sin(x)*cos(2*x)
z = round(randomu(1, 50)*100)
p = plot(x, y, 'o', $
/sym_filled, $
vert_colors=bytscl(z), $
rgb_table=39)
cb = colorbar(rgb_table=39, $
range=[0,100], $
position=[0.50, 0.20, 0.90, 0.23])
Note that I bytescaled the Z values.
mp
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| Re: Help with vert_colors and rgb_table [message #82972 is a reply to message #82958] |
Mon, 28 January 2013 09:40 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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justinclouds writes:
> I am trying to plot x, y and z where x and y are plotted in XY plot and z is a color vector. This is the command I use and it works well:
>
> p=plot(x, y, symbol='o', LINESTYLE = ' ', vert_colors=z, rgb_table=39)
>
> What I need is to be able to show the color scale in the plot area to give an indication of the scale on the z values. Also, can the color range in z values be controlled?
>
> More info:
> x, y and z are FLOAT = Array[507]
> z has range from 0 to 100.
>
> Any help with proper syntax is appreciated.
I don't know how this is done in function graphics. There
is an example of how it is done in Coyote Graphics in the
Colored Line Plots example in the Gallery. To restrict Z
to 100 colors, for example, simply replace the value
255 with 100 in the elevColors variable, and restrict your
color table to 100 colors with the NColors keyword.
http://www.idlcoyote.com/gallery/
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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