Re: setting 'color' for a plot with multiple lines

[Ben Abbott]

On Jan 20, 2013, at 3:58 PM, address@hidden wrote:

> Dear all,
> 
> I want to set the colors to some standard without cycling through each of 
> them manually or via a for-loop.
> 
> The following script show my attempt and I do not understand why the last one 
> doesn't work.
> (some plot() commands are commented to not let Octave stop at it).
> 
> Can someone explain why the bottom plot() command doesn't work when I feed it 
> a proper cell?
> 
> --------------------------------------------------
> 
> x=[linspace(0,2,30)' , linspace(0,2,30)'];
> y=x;
> y(:,1)=sin(x(:,1));
> y(:,2)=cos(x(:,2));
> 
> figure
> p=plot(x,y);
> standardcolors=get(p,'color')
> % this works, but the colors are not what I want
> 
> figure
> K=rainbow(size(y)(2));
> %p=plot(x,y,'color',K);
> %% this doesn't work. Because K is a matrix?                                  
>                                                                               
>                             
> 
> figure
> KK=mat2cell(K,ones(1,size(K)(1)),3)
> whos standardcolors KK
> 
> %plot(x,y,'color',KK)
> % why doesn't this work?
> 
> figure
> p=plot(x,y)
> get(p,'color')
> set(p,'color',KK)
> 
> --------------------------------------------------
> 
> many thanks,
> 
> indium

The syntax you're attempting is not valid.  The set() command isn't specific to 
a particular object type.  Thus, properties can have values that belong to any 
class ... including cells.  

You can get the result you want with the line below.

        arrayfun (@(n) set (p(n), 'color', KK{n}), 1:numel(p));

Ben