Re: pm3d palette question

[Ethan M. <merritt@u.washington.edu>]

On Monday 03 March 2008 17:42, Philipp K. Janert wrote:
> 
> Here is my question (in short):
> Is it possible to adjust the slice of the spectrum
> shown in the colorbox without affecting the mapping
> of colors to z-values?

I can't think of a good way to do this currently.
A very ugly way is to use 
  "set colorbox user origin X,Y size XX,YY"
to create a huge colorbox that goes off-scale, then
cover over the unwanted extremities with white-filled
rectangles.

This is yet another case in which it would be very nice to
be able to specify a mapping function linking the scales of
two different plot axes.  Usually people want this for x / x2,
but in your case I guess it would be z / cb.

	Ethan

 
> Here is what I try to do:
> 
> Say, I want to plot some data, the values of which
> are in the range [0:100], and I want to show ALL 
> the values, therefore: set zrange [0:100]
> 
> Now I have a very skewed palette, like so:
> set palette defined ( 0 'red', 1 'white', 100 'blue' )
> 
> For convenience, the index in the colorbox maps
> directly to the z-value.
> 
> Now I want to show in the colorbox only those colors
> that map to z-values between 0 and 10, without
> affecting the mapping!
> 
> Is there a way to do this?
> 
> Using set cbrange [0:10] will not do it, because this
> affects the mapping. It will associate "blue" with the
> z-value 10 and adjust all the intermediate values
> accordingly. That's not what I am trying to do.
> 
> Any suggestions?
> 
> Best,
> 
> 		Ph.
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> gnuplot-beta mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-beta
> 

-- 
Ethan A Merritt            Courier Deliveries: 1959 NE Pacific
Dept of Biochemistry
Health Sciences Building
University of Washington - Seattle WA 98195-7742