How do I color lines by a third variable?

I would like to color 27 lines that are plotted from an array using a for loop by color according to a third variable as defined in its own array, but I cannot figure out how to get the coloring to work. All the lines are plotted but their colors are random, of course. Any help is greatly appreciated.

My code is below. I want to plot my 27 lines (which are in ciisoarr) and color them according to their value in eNdarr.

%Code for importing data from a 45N Data Excel Spreadsheet and defining

%arrays

ciiso = readtable("cinormisot.xlsx");

ciisoarr = table2array(ciiso);

eNd = readtable("eNdtable.xlsx");

eNdarr = table2array(eNd);

elements = {'La';'Ce';'Pr';'Nd';'Sm';'Eu';'Gd';'Tb';'Dy';'Ho';'Er';'Tm';'Yb';'Lu'};

elements = categorical(elements);

%Plot code below

for i = 1:27

plot(ciisoarr(:,i))

hold on

end

ylabel("CI-Normalized",'FontWeight','bold','FontSize',16)

ylim([1 100])

set(gca,'YScale','log')

set(gca,'xtick',[1:14],'xticklabel',elements,'FontWeight','bold','FontSize',12)

[Cole Messa]

And here is what my plot looks like as of now.

[Voss]

Can you upload the .xlsx files?

[Cole Messa]

I cannot. The plotted lines are 27 columns of data, each plotted as a line. The data that I want to color the lines by is a single column of 27 numbers.

Answer 1

[Image Analyst]

Try this:

% Create data since you won't upload it.
ciisoarr = zeros(50, 27);
for col = 1 : 27
    ciisoarr(:, col) = rand(50, 1) + col;
end
% Now we have data and we can make up a list of colors and plot it.
cmap = turbo(27);
for col = 1 : size(ciisoarr, 2)
    plot(ciisoarr(:, col), '-', 'Color', cmap(col,:), 'LineWidth', 3);
	hold on;
end
hold off;
grid on;

[Cole Messa]

Thanks! Now how do I make the line colors based off an array of 27 numbers?

[Image Analyst]

Not sure what you mean. The colormap has 27 colors in it. The first column of cmap is the red value, the second value is the green value, and the third value is the blue value. You can create a list of colors in any way that you want. You can create it programmatically like I did or you can use the app:

>> colormapeditor

Not sure what your 27 element vector is. If you want, it could be pointers to colors (rows) in the colormap, like

for col = 1 : size(ciisoarr, 2)
    % Find out what row of the colormap the vector is directing us to.
    thisColorsRow = vec27(col); 
    % Extract the actual color from this row of the colormap.
    thisColor = cmap(thisColorsRow, :); % A 1 by 3 vector of [r, g, b] values in the range 0 to 1.
    % Plot the curve with this specific color
    plot(ciisoarr(:, col), '-', 'Color', thisColor, 'LineWidth', 3);
    hold on;
end

but I don't think that's really what you want, so you have to explain more.