Re: changing the color of curves continuously

[Quentin Spencer]

Julien Tailleur wrote:

> Robert A. Macy a écrit :
>  
>
> > More colors than that.
> >
> > try this...
> >
> >
> >    
> >
> > > > x=randn(50,16);plot(x);
> > > >        
> > you will see a wide range of colors
> >    
>
> Hi,
>
> I am sorry, I was not clear enough. What I have is a series of data's files
>
> toto.02.txt
> toto.04.txt
> ...
> toto.50.txt
> ...
> toto.96.txt
> toto.98.tx
>
> Each of these file corresponds to a two dimensional curves. I would like
> to plot all these curves on the same plot, associating a specific color
> for each file in the following way
>
> 02 -> yellow
> 50 -> orange
> 98 -> red
>
> and varying continuously in between. If I could specify the color of a
> curves using Red Green Blue system, it would be perfect (and I know it
> is possible with Matlab), but I don't manage to do it.
>
> Thanks a lot for your answers
>  

So, you want to specify the line color using an exact RGB value? I 
looked at doing this once, and I think gnuplot doesn't have this 
capability. If you read the man page for gnuplot, it says you can change 
the default colors by setting the X resources at startup using a 
.gnuplot file or command-line switches with things like this:
gnuplot*line1Color: red

The problem is I think it still only recognizes 8 colors. There is a 
"palette" line style in 3-D mode, but I don't know if it would help you. 
For an example, go into gnuplot and try the command:
splot x*x with line palette

I'd really like to see the mesh function switch to using this line 
style--it's closer to what Matlab does. For a 2-D plot with more control 
over line colors, I think you may need to look at some of the alternate 
graphics modules that others have proposed.

-Quentin



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