add lines through origin in 3D scatter plot
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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?
回答（2 个）
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
7 个评论
Felix Flores James
2019-4-9
Star Strider
2019-4-9
Post your code.
When I call zline in scatter3, I get:
Undefined function or variable 'zline'.
This in R2019a.
Adam Danz
2019-4-9
What's the result of
which zline
Felix Flores James
2019-4-9
编辑：Felix Flores James
2019-4-9
scatter3(O_Synthetic(:,1),O_Synthetic(:,2),O_Synthetic(:,3),'filled','MarkerFaceColor',[0 1 0]); %green
text(O_Synthetic(:,1),O_Synthetic(:,2),O_Synthetic(:,3),OSnames,'FontSize',8);
hold on;
scatter3(O_Natural(:,1),O_Natural(:,2),O_Natural(:,3),'filled','MarkerFaceColor',[1 1 0]); %yellow
text(O_Natural(:,1),O_Natural(:,2),O_Natural(:,3),ONnames,'FontSize',8);
hold on;
scatter3(Cl(:,1),Cl(:,2),Cl(:,3),'filled','MarkerFaceColor',[1 0 0]); %red
text(Cl(:,1),Cl(:,2),Cl(:,3),Clnames,'FontSize',8);
hold on;
scatter3(C(:,1),C(:,2),C(:,3),'filled','MarkerFaceColor',[0 0 0]); %black
text(C(:,1),C(:,2),C(:,3),Cnames,'FontSize',8);
legend(legendname);
xline(0,'--k');
yline(0,'--k');
zline(0);
I have MATLAB version 2018b btw
Felix Flores James
2019-4-9
Felix Flores James
2019-4-9
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.
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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2019-4-9
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