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

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Jouni Lohikoski
Jouni Lohikoski 2014-1-20
回答： Jouni Lohikoski 2014-1-20
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: http://www.mathworks.se/help/matlab/ref/stem.html ("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."

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采纳的回答

AJ von Alt
AJ von Alt 2014-1-20
编辑：AJ von Alt 2014-1-20
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')

更多回答（2 个）

Bruno Pop-Stefanov
Bruno Pop-Stefanov 2014-1-20
If you want to plot two series in the same axes in red and in blue, use hold on like in the following:
figure;
stem3(A(:, 1), A(:, 2), A(:, 3), 'r')
hold on
stem3(A(:, 1), A(:, 2), A(:, 4), 'b')
hold off
Jouni Lohikoski
Jouni Lohikoski 2014-1-20
Thanks you both. It ("hold") should be mentioned in the stem3 help page.

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