Plotting, hold-on, colors

[Ben Abbott]

On Sep 1, 2008, at 5:25 PM, Ben Boxman wrote:

>
> Hi,
>
>  I've compiled the latest Octave (3.0.2) And the latest released  
> gnuplot
> (4.2.3).
>
>  I'm vexed by octave/gnuplot not changing colors when plotting  
> additional
> plots with hold-on. Yes, I know I can set colors manually (or pass all
> arguments to one big plot call) -- but this is:
> 1) Cumbersome for normal plots.
> 2) Even more cumbersome when using hist() and other built-in functions
> on-top of plot (with hist, you can get the output, and then call yet  
> another
> function (bar -- that doesn't produce exactly the same results  
> ([x,y] =
> hist(z); bar(y,x);  -- is visually different than hist(z) --  
> probably some
> style default?)....).
>
>  This used to work properly in previous (<2.9.x) versions of octave.  
> I use
> plots extensively, typically, I'll crunch some numbers in the  
> command line
> and blurt them out as a plot/histogram (much easier to do this in  
> octave
> than in gnuplot, any manipulation/processing/filtering is so much  
> easier
> inside of octave). Just about every second plot I make involves  
> multiple
>
>  Is there any quick solution for this?
>
>  Is this a gnuplot issue (e.g. like the zoom problem)? Will this be  
> solved
> if I compile the unstable gnuplot 4.3?
>  Is there any way I can patch octave to fix this (e.g., changing the
> default 'blue' to something cyclic, and intercepting hold and  
> resetting said
> cyclic variable?)?
>
>
> Man thanks,
>
> Ben Boxman

The Octave developers are actively working to improve Octave's  
compatibility with Matlab.

Regarding  the order of the colors, you can change the order by  
modifying the "colororder" property associated with the axis.  See ...

 > get (gca, 'colororder')

  ans = 0.00000 0.00000 1.00000
        0.00000 0.50000 0.00000
        1.00000 0.00000 0.00000
        0.00000 0.75000 0.75000
        0.75000 0.00000 0.75000
        0.75000 0.75000 0.00000
        0.25000 0.25000 0.25000

so you could

	colors = get (gca, 'colororder')

them modify the colors and/or order and then

	set (gca, 'colororder', colors)

Is that sufficient for you needs?

Ben






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