how to draw a 3d plot with different color?

Hi

I want to assign different color to the specific values in a 3D plot. for example: I have x=[1;2;4;3] y=[1;2;3;4] z=[0.1;0.2;0.3;0.4]

for z>=0.2 scatter3(x,y,z,'b','.') for z=<0.2 scatter3(x,y,z,'g','.')?

thanks

Answer 1

[Rik]

Logical indexing is your answer:

scatter3(x(z>0.2),y(z>0.2),z(z>0.2),'b.')
hold on
scatter3(x(z=<0.2),y(z=<0.2),z(z=<0.2),'g.')

[farfar]

Thanks !

[farfar]

is there a way that I can have a color bar in the plot to say z<0.2 in green and more than 0.2 is blue ?

[Rik]

You could hack a colorbar to do something like that, but it won't be pretty. (set the tick property to 0.2 and use caxis)

[Walter Roberson]

color = repmat('b', size(z));
color(z<0.2) = 'g';
pointsize = 20;
scatter(x, y, pointsize, color);