colouring dots in scatter3 according z-value

plot3 gives colours according to height above the xy-plane. Is that possible with scatter3 too?

Answer 1

[Star Strider]

It is relatively straightforward to do what you want:

x = rand(10, 1);                                                % Create Data
y = rand(10, 1);                                                % Create Data
z = rand(10, 1);                                                % Create Data

zscaled = z*10;                                                 % May Be Necessary To Scale The Colour Vector
cn = ceil(max(zscaled));                                        % Number Of Colors (Scale AsAppropriate)
cm = colormap(jet(cn));                                         % Define Colormap

figure(2)
scatter3(x, y, z, [], cm(ceil(zscaled),:), 'filled')
grid on

[Kate Retallick]

This is great, thank you, been searching for something that would work for me for ages!

[Star Strider]

My pleasure!

(A vote would always be appreciated!)

[Maria Zilidou]

what happens if x,y,z are matrices? for example x,y,z are 10x10 matrices. how do you asign colours according to the value of z using scatter3?

[Star Strider]

@Maria Zilidou —

I would create them as vectors using the (:) subscript notation:

scatter3(x(:), y(:), z(:), [], z(:))

or something similar and appropriate.

.

Answer 2

[Weia Reinboud]

Yes I'd read that. But that means every dot has that color C, not that colors vary by the value of z. Or am I wrong?

[José-Luis]

You can specify the color as a linear function of z:

x = 1:10;
z = fliplr(x);
scatter3(x,x,z,2,z)

Answer 3

[Weia Reinboud]

Excellent, it works! It does not look as code I could ever having been able to find by myself. Thank you very much.

[Star Strider]

As always, my pleasure!