How can I plot multiple 2d plots with a z value that changes the value of each line?

Hello,

I have x, y and z data. I would like to plot x and y data for all different z values using plot, and vary each line color based on the corresponding z value. I want to specfically use plot so that I may use straight lines, and so I am not interested in using scatter, nor contour.

For example...

colormap(jet(3))
hold on
plot(linspace(0,10),linspace(0,10)+1)
plot(linspace(0,10),2.*linspace(0,10)+1)
plot(linspace(0,10),.25.*linspace(0,10))
hold off
hc=colorbar;
cb=1:5:10;
set(hc,'YTick',cb, 'YTickLabel', {'1','5','10'})

This will return...

which is not what I want for multiple reasons. First, the lines do not match the jet colormap settings I have inputted. Second, the colorbar does not have all the tick labels. How can I fix this so that the color of the plot lines matches the colorbar and the ytick labels are shown correctly?

Answer 1

[Mathieu NOE]

hello Alessandro

check this please

n = 3;
z = [1 2 0.25]';
z = sort(z,'ascend');

x = linspace(0,10);
y = z*x;

data_min = min(y,[],'all');
data_max = max(y,[],'all');

map = colormap(jet(n));
[mmap,nmap] = size(map);

hold on
for ci = 1:n
    h = plot(x,y(ci,:));
    set(h, 'Color', map(ci,:)) ;
  
end
hold off

hc=colorbar;
cb=(1/(2*n):1/n:1);
set(hc,'YTick',cb, 'YTickLabel', num2str(z))
hc.Title.String = "Z range";

[Alessandro Maria Laspina]

Thank you, this is what I wanted.

[Alessandro Maria Laspina]

How can I make this work for tiledlayout? If I use a tilelayout structure, what will end up happening is that the colorbar will go from a discrete color representation to a gradient where it gradually changes from one color to another, and it makes it harder to distinguish.

EDIT: nevermind it also works with tiledlayout.