Scatter3, insert dashed line downwards, and sideways

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Joel
Joel 2016-10-6
评论： Joel 2016-10-6
I want to show my data in a scatter3 plot.
However, the way the data is shown, it is not very clear where exactly on the 3 axis the data points are.
An example,
figure;
x = 0.9914;
y = 0.0390;
z = 20
scatter3(x,y,z,'filled')
view(-30,10)
What I would like to do is to draw a dashed line straight downwards from the point, so that it is clearer where the point is on the XY plane. Also, I would like to draw a dashed line from the point to the Z axis, so that it is clear where the point is on the Z axis plane.
If this turns out to be too messy I will look at a way to write the XYZ values for each point just above each point.

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采纳的回答

Giovanni Mottola
Giovanni Mottola 2016-10-6
Here I assumed x, y, z are vectors of length "len".
To draw a line joining each scatter point to the horizontal plane use:
hold on
for i=1:len
plot3([x(i), x(i)], [y(i), y(i)], [0, z(i)], 'b--')
end
To draw a line joining each scatter point to the vertical axis use:
for i=1:len
plot3([0, x(i)], [0, y(i)], [z(i), z(i)], 'r--')
end
Final result for len=5 (random points):
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Giovanni Mottola
Giovanni Mottola 2016-10-6
Try:
view([0, 0])
ylim([0 2.2])
xlim([0 2.2])
zlim([0 2.2])
And
view([90, 0])
ylim([0 2.2])
xlim([0 2.2])
zlim([0 2.2])
Joel
Joel 2016-10-6
Thanks Giovanni!
You are/were indeed right that it is an issue of perspective.
Still if I would like to show this plot to someone it is very misleading. By looking at the figure I posted one does not think the Z value is 2.
I tried some other perspectives and I noticed that when the first variable of view is negative I get plot where it seems like Z is not 2. If I change it to positive, then it looks as I expect it to!
Thank you very much for your help!

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