How can I automatically plot graphs two by two of the same color?

I mean: I have ten graphs to plot on the same figure. Each graph has its own (let's call it) related-graph, which has to be plotted on the same image. I want each graph and its related-graph to be the same color!

I thought of using

 hold all

whit some changes, but it doesn't work!

Here's a code example:

 x = 0:1:10;
 figure(1)
 for a=1:10;
  y = a*x;
  figure(1)
  plot_handle = plot(x,y);
  hold on
  plot(x,10*a*ones(1,length(x)),'Color',get(plot_handle,'Color'));
  hold all
  grid on
  box on
 end

1st graph (and its related) is blue: ok.

2nd graph is green: ok.

From 3rd to 10th graphs are ALL green: bad!

Answer 1

[dpb]

One way...

M
x = 0:1:10;
color={'b';'g';'r';'c';'m';'y';'k'};
for a=1:10;
  y = a*x;
  c=color{fix((a+1)/2)};
  plot(x,y,'color',c)
  if a==1, hold on, end
  plot(x,10*a,'Color',c);
end
grid on
box on

[Paolo Minotti]

Your code doesn't work properly, because, let's say, plots a=1 and a=2 have both the same color.

I know that one solution would be to create an array such as

 color = ['b','g','r','c','m','y','k'];

and using the index

 a

to change the color inside the loop. But this can work only if you know in advance the number of loops of the

 for

loop. This is not my case, because I don't know, in advance, how many graphs I have to plot. So I would like to use

 hold all

or something like that.

[dpb]

So, keep an independent counter...doesn't have to be a counted loop. You can also index into the 'colororder' property of the axes object instead of making up an external table; I just did it to use the mnemonic letters to be able to read the code more easily.

Or, give a more representative sample of how you're generating the pairs of plots you want to keep together to get more specific possible solutions.

The previous was simply indicating one way in which to select a given color for a specific plot--adapt to the situation or if you don't actually see how to do that, as above says, give more specific context