MATLAB: Colormap for multiple plots

Question

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])

Answer 1

See my attached demo.