Plot several lines in Matlab without for-loop

Question

In Matlab I have two Nx3 matrices P and Q and each line represents a point. I want to plot lines between the points that are in the same row of the matrices.

Following Code does it:

for i=1:N
  plot3( [P(i,1) Q(i,1)], ...
         [P(i,2) Q(i,2)], ...
         [P(i,3) Q(i,3)] )
end

Is there a way to do it without a for-loop?

If I give plot3 the points just as vectors, Matlab draws lines between Q(i,:) and P(i+1,:) in addition to the lines I want.

groovingandi · Accepted Answer · 2011-05-26 14:26:03Z

4

Try

plot3([P(:, 1) Q(:, 1)]', ...
      [P(:, 2) Q(:, 2)]', ...
      [P(:, 3) Q(:, 3)]')

If you feed a matrix to the Matlab plotting functions, each column corresponds to one line drawn.

answered May 26, 2011 at 14:26

groovingandi

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Comments

Singlet · Accepted Answer · 2011-05-26 14:31:08Z

0

Probably you want this:

h = quiver3(P(:,1), P(:,2), P(:,3), Q(:,1), Q(:,2) , Q(:,3),0);

set(h,'ShowArrowHead','off');

answered May 26, 2011 at 14:31

Singlet

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