add lines through origin in 3D scatter plot

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Felix Flores James
编辑： Adam Danz 2019-4-15
hey everyone,
I am trying to use the xline, yline function to insert lines at x = 0 and y=0 in my score plot. This works. However, when for some reason the zline function does not work when I want to specify a colour.
xline(0,'--k');
yline(0,'--k');
zline(0,'--k');
But when I change zline to:
zline(0)
I get the z = 0 line in a yellow colour. Is there a way to make this line dashed and black?

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回答（2 个）

Adam Danz
Adam Danz 2019-4-9
编辑：Adam Danz 2019-4-15
There is no zline() funciton built into matlab (2019a). Note that xline and yline became available in 2018b.
xline and yline plot the reference lines in the middle of the z axis. To plot the origin lines (or any other 3D reference lines),
xlim([-1 1]);
ylim([-1 1]);
zlim([-1 1]);
hold on;
line(2*xlim, [0,0], [0,0], 'LineWidth', 3, 'Color', 'k');
line([0,0], 2*ylim, [0,0], 'LineWidth', 3, 'Color', 'k');
line([0,0], [0,0], 2*zlim, 'LineWidth', 3, 'Color', 'k');
view(3)
grid on
190415 124851-Figure 1.jpg
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Felix Flores James
Felix Flores James 2019-4-9
is there a different way to add a z-line? I also would like to know how to remove the lines from my legend
Adam Danz
Adam Danz 2019-4-9
编辑：Adam Danz 2019-4-11
I edited my answer to show how to plot the origin lines. The xline and yline functions don't work well with 3D plots since their z values are in the middle of the z axis.
To avoid the lines appearing in the legend, either
1) after creating the legend, turn off auto-updating: legend(...,'AutoUpdate','off')
2) plot the legend at the end and specify the handles that should appear in the legend.

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Star Strider
Star Strider 2019-4-9
One option:
zx = 0;
zy = 0;
figure
scatter3(rand(10,1), rand(10,1), rand(10,1))
hold on
xline(0,'--k');
yline(0,'--k');
plot3([1 1]*zx, [1 1]*zy, [zlim], '--k') % Plot ‘zline’ At (zx,zy)
hold off

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