Jouni Lohikoski asked . 2022-10-31

How to plot several sets (in different colours) with stem3-plotting function?

So I have several line array A which has columns [x, y, val1, val2]. For example, I want to have a single stem3-plot, where val1s are red and val2s are blue.

stem3(A(:, 1), A(:, 2), A(:, 3), 'red') % Will plot vals1 in red.

But how to get then vals2 in colour blue to the same stem3-plot?

Tried something similar which works with 2D-stem:

("Plot Multiple Data Series"), but it didn't work

stem3(A(:, 1), A(:, 2), [A(:, 3), A(:, 4)]); "Error using stem3. The length of X must match the number of columns of Z."

stem3(A(:, 1), A(:, 2), [A(:, 3); A(:, 4)]); "Error using stem3. X and Y must be same length as Z or the lengths of X and Y must match the size of Z."

stem3 sets colors , 2-D and 3-D Plots, Discrete Data Plots , Stem Plots

Expert Answer

Prashant Kumar answered . 2024-12-21 14:53:48

You can use hold to overlay multiple plots on one set of axes. The following code demonstrates the concept using stem3 to plot the datasets.

% Random inputs
A = randn(20,3);
B = randn(20,3);

figure;
% Create a 3-D stem plot for dataset A
stem3( A(:,1) , A(:,2) , A(:,3) ,'blue')

hold on; % Activate hold

% Create a 3-D stem plot for dataset B
stem3( B(:,1) , B(:,2) , B(:,3) ,'red')

hold off %turn off hold

legend('A','B')

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