Use the same color multiple times in a plotting loop

Hello everyone,

I have a problem with a plotting loop, where I am plotting the spectral data and following the fit. For the reason of clarity I want to have them both in the same color, however matlab switches to the next color in order. Can anyone give me hint how to avoid this?

Ralf

[Narges M]

How do you mean? you could introduce a color variable and update it only after all the plots of each iteration are done. Maybe if you put parts of your code here, it would be easier to understand.

[Ralf Niemann]

exactly that. I hope this makes my problem more clear:

folder=dir('*.csv');

for i=1:length(folder)

      file=folder(i,1).name;
      A=csvread(file);
      plot(A(:,1),A(:,2));
      hold all
      f(:,1)=A(:,1);
      f(:,2)=smooth(A(:,2),0.01,'lowess');
      plot(f(:,1),f(:,2),'--');
  end

[Ralf Niemann]

problem solved:

folder=dir('*.csv');
cc=lines(length(folder));

for i=1:length(folder)
      file=folder(i,1).name;
      A=csvread(file);
      plot(A(:,1),A(:,2),'Color',cc(i,:));
      hold all
      f(:,1)=A(:,1);
      f(:,2)=smooth(A(:,2),0.01,'lowess');
      plot(f(:,1),f(:,2),'Color',cc(i,:),'--');
end

Answer 1

[Narges M]

You could use a colormap such as HSV to generate a set of colors. For example:

folder=dir('*.csv');
N = length(folder);
col=hsv(N);
for i=1:N
      file=folder(i,1).name;
      A=csvread(file);
      plot(A(:,1),A(:,2),'color',col(i,:));
      hold all
      f(:,1)=A(:,1);
      f(:,2)=smooth(A(:,2),0.01,'lowess');
      plot(f(:,1),f(:,2),'--','color',col(i,:));
  end

You can read more in Matlab documentations: http://www.mathworks.com/help/techdoc/creating_plots/bqsxy_a-1.html