Colormap for multiple plots

Hi,

I have a matrix K of size N x n and I plot the values of K on the same figure by using "hold on" n plots with N values each.

I would like to use a color map (from -1 to 1 , Blue to Red) in the following way: the n-th plot has color "0.4" or yellow if the first value of the column K(1,n) = 0.4 and so on.

How can I achieve this please?

Here is the code I have been trying to play with ( in particular adding the option 'Color' then 'jetcustom' in the plot options returns an error, I was trying to do like in this answer MathWorks Answer)

colormap(jet(n));
jetcustom=jet(n);
     
figure

x=1:k;

for i=1:n
    
    y=K(:,i);
    
    I=ismember(i,A);
    J=ismember(i,B);    
    
    if I==1
        plot(x,y,'--');
    elseif J==1
        plot(x,y);
    end
    
    hold on
    
end   

    xlim([1 k]);
    ylim([-1.5 1.5])
    
    colormap(jet(10))
    cb=colorbar;
    caxis([-1 1])

[Sha]

I used both answers below! Thank you!

jetcustom=jet(n);
r1=K(1,:);
colors = interp1(linspace(-1, 1, n), jetcustom, r1.');

figure()

set(gca, 'ColorOrder', colors , 'NextPlot', 'replacechildren');
    
x=1:k;

for i=1:n
    
    y=K(:,i);
    
    I=ismember(i,Con);
    J=ismember(i,Ex);    
    
    if I==1
        plot(x,y,'--');
    elseif J==1
        plot(x,y);
    end
    
    hold on
    
end   

    xlim([1 k]);
    ylim([-1.5 1.5])
    
    colormap(jet(10))
    cb=colorbar;
    caxis([-1 1])

Answer 1

[Image Analyst]

See my attached demo.

[Sha]

thank you very much! I used the following from your file

set(gca, 'ColorOrder', colors , 'NextPlot', 'replacechildren');

[Image Analyst]

Can you "Accept this answer" then? Thanks in advance.

[Sha]

Thanks, I can and I will, I just wanted to accept both answers as I used both to solve my problem but MathWorks doesn't allow me to do so;

[Image Analyst]

Correct. However, if you like other answers, you can also award them the same number of "reputation points" (as an Accept) by clicking the "Vote" thumbs up icon. Thanks again. Feel free to come back anytime.

Answer 2

[Ameer Hamza]

colormap is not used for deciding the color of plot() lines. For that, you need to modify ColorOrder property. Something like this should work.

jetcustom = jet(n);
r1 = K(1, :); % first row decide the colors
colors = interp1(linspace(-1, 1, n), jetcustom, r1.');
     
figure()
ax = axes()
ax.ColorOrder = colors; % colororder(ax, colors)

x=1:k;

for i=1:n
    
    y=K(:,i);
    
    I=ismember(i,A);
    J=ismember(i,B);    
    
    if I==1
        plot(x,y,'--');
    elseif J==1
        plot(x,y);
    end
    
    hold on
    
end   

    xlim([1 k]);
    ylim([-1.5 1.5])
    
    colormap(jet(10))
    cb=colorbar;
    caxis([-1 1])

[Sha]

Thank you very much seems like a great idea to fix the first line for the colors, but sadly I still get the same figure. Any idea why the plot is not taking into account the ColorOrder?

[Sha]

Thank you it worked with this slight modification:

jetcustom=jet(n);

r1=K(1,:);

colors = interp1(linspace(-1, 1, n), jetcustom, r1.');

figure()

set(gca, 'ColorOrder', colors , 'NextPlot', 'replacechildren');