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Re: Plotting into table with multiple columns

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Hi Ethan,

sorry for the late reply. I had been too busy recently for having a 
frequent look into the group (and thus, unfortunately, did not yet check 
the patch or the recent addition to CVS, but I will :-)).

But thank you so far for implementing this (and thank's to Dave Green 
for inventing this method)!


On 2011-09-22 01:43, EAMerritt@gmail.com wrote:

> However, the example you posted earlier used different coefficients
> than the
> ones used in Green's example.   From your experience, do you recommend
> making
> this or some other change?  Would it be worth taking a step back and
> making
> "cubehelix"  a separate palette option with its own set of defining
> parameters?

I can give more specific answers after having tested the recent addition 
to the CVS version. In general, I have understood Dave Green's paper and 
web page so that "cubehelix" refers to the whole method, while he 
repeatedly used the specific color scheme as an example.

In my case, I have used others more frequently (also a modification that 
uses the L*a*b* space (CIE 1976) rather than RGB directly (formulae are 
taken from Wikipedia; I haven't made a Gnuplot script yet, only a 
Fortran program that outputs ready-for-use palette files; "colorhelix" 
on my gnuplot colortools page). However, both methods have their pro's 
and con's.

> The general case would be easy enough to implement, but it would not
> produce
> size-optimized PostScript output like the rgbformulae option.  On the
> other hand,
> so far as I know PostScript is the only output mode for which
> providing an
> rgbformulae yields a size advantage.

Another issue I will test asap is the speed of calculating the color 
scheme. For example, I have dropped using my cubehelix gnuplot script 
directly in favor of using the RGB output palettes for SPH 
visualisation, because their the usage of function-defined palettes (in 
particular, set palette function; i didn't check with rgbformulae yet) 
makes the rendering process take several times longer. But that might be 
a consequence of the user-defined function parsing and might be faster 
with built-in formulae.

Greetings,

Ingo

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Thread

Plotting into table with multiple columns Ingo Thies <ingo.thies@gmx.de> - 2011-08-27 11:24 +0200
  Re: Plotting into table with multiple columns Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-08-27 13:41 +0200
    Re: Plotting into table with multiple columns Ingo Thies <ingo.thies@gmx.de> - 2011-08-27 17:04 +0200
  Re: Plotting into table with multiple columns sfeam <sfeam@users.sourceforge.net> - 2011-08-27 22:56 -0700
    Re: Plotting into table with multiple columns Ingo Thies <ingo.thies@gmx.de> - 2011-08-28 12:59 +0200
      Re: Plotting into table with multiple columns Christoph Bersch <usenet@bersch.net> - 2011-09-02 10:23 +0200
      Re: Plotting into table with multiple columns "EAMerritt@gmail.com" <eamerritt@gmail.com> - 2011-09-21 16:43 -0700
        Re: Plotting into table with multiple columns Ingo Thies <ingo.thies@gmx.de> - 2011-10-08 13:16 +0200
        set palette cubehelix Ingo Thies <ingo.thies@gmx.de> - 2011-10-08 13:55 +0200
          Re: set palette cubehelix sfeam <sfeam@users.sourceforge.net> - 2011-10-08 10:48 -0700
            Re: set palette cubehelix sfeam <sfeam@users.sourceforge.net> - 2011-10-08 14:30 -0700

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