Generating a Legend for Colormap

I have several lines plotted on one graph that are color-coded by a colormap. I want to add a legend (not colorbar) that idenitifies each of the lines by their color. The colormap is working and the legend is generated, by the markers in the legend are all black. Here is what I have

cm = jet(size(x_mtx))

for i=1:size(x_mtx)
    p3=plot(x_mtx(i,:), 'Color',cm(i,:));
    hold on;
    leg_label(i,:) = sprintf('%1.2e',rmse_mtx(i,1));
end
leg=legend(leg_label);

How can I color the legend with the color corresponding to the line plotted?

Answer 1

[KSSV]

Refer here:

https://in.mathworks.com/matlabcentral/answers/228977-editing-colors-in-the-legend

[Camille Woicekowski]

This seems to work, but it'd get tedious typing in the values for each legend handle when I have 15+. Can I use this method, but set the legend labels in the for loop? The info for the labels saved in a 22x1 matrix (rmse_mtx). I tried

clear p
for i=1:size(x_mtx)
    p3=plot(x_mtx(i,:),'Color',cm(i,:));hold on
    p(i)=p3(1);
    legend(p,{sprintf('%1.2e', rmse_mtx(i,:))});
    %label(kk,:) = sprintf('%1.2e',rmse_mtx(kk,1));
end

but this only gives me the first label.