MATLAB: How to change the line color in a 2D graph using colormap

colorcolormapMATLABplotsurf

Hello everyone,
there is a mx5 matrix composed by the following columns:
x1 y1 x2 y2 c
where (x1,y1) and (x2,y2) are respectively the initial e and final coordinates of a link; c is the "color" variable.
I would like to assign a different color to the links according to c, using colormap.
I have already adopted the following solution:
A = rand(10,5);
  c = A(:,5);
  for i=1:10
      x1=A(i,1);
      y1=A(i,2);
      x2=A(i,3);
      y2=A(i,4);
      plot([x1,x2],[y1,y2],'Color', [c(i) 0.2*(1-c(i)) 0.3*(1-c(i))])
      hold on
  end
The result is not satisfying. I would like to use the default colormap, but I know that is not possible to use it with plot. Does anybody know if it is possible to use surf? And how?
I need it for my thesis, any help is appreciated. Thanks a lot! 🙂

Best Answer

I am not certain what result you want.
Try this:
A = rand(10,5);
cm = colormap(parula(size(A,1)));                           % Default Colormap
% c = A(:,5);
for i=1:10
    x1=A(i,1);
    y1=A(i,2);
    x2=A(i,3);
    y2=A(i,4);
    plot([x1,x2],[y1,y2],'Color', cm(i,:))
    hold on
end
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