Change colors (of groups) in scatter plot

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Sim
Sim on 31 Oct 2023
Edited: Sim on 31 Oct 2023
The following matrix contains around 80 rows, representing 2-dimensional points (each row corresponds to a point), and 3 columns, containing each point's x-coordinate, y-coordinate, and an integer number indicating the group to which the point belongs to, i.e. (-1, 1, 2, 3, 4). The latter integer number, i.e. (-1, 1, 2, 3, 4), comes from a clustering algorithm and it is taken by scatter(x,y,sz,c) to color all the points according to the belonging group. Now, how can I change the colors of the groups of points? I do not know what is the reference color set or color map used by scatter(x,y,sz,c), but can I change it, for example to c = turbo, or other color sets?
a = [37 98 1
35 94 1
33 97 1
33 99 1
31 96 1
30 97 1
29 100 1
30 94 1
31 90 1
28 93 1
21 63 1
20 61 1
22 60 1
24 60 1
24 64 1
27 62 1
28 65 1
27 59 1
23 57 1
26 56 1
27 57 1
29 57 1
31 60 1
31 61 1
31 64 1
32 66 1
36 60 1
37 56 -1
32 56 1
31 54 1
27 53 1
13 43 2
17 42 2
17 40 2
19 37 2
14 40 2
13 42 2
10 41 2
10 42 2
9 39 2
6 40 2
25 20 3
24 18 3
26 18 3
27 19 3
27 21 3
29 21 3
30 22 3
30 23 3
31 26 3
33 27 3
35 28 3
94 11 4
95 10 4
97 8 4
94 8 4
93 8 4
99 12 4
97 12 4
98 15 4
95 14 4
91 15 4
92 17 4
91 19 4
89 19 4
87 21 4
89 22 4
86 23 4
84 25 4
81 25 4
80 26 4
82 26 4
79 29 4
82 29 4
83 29 4
86 28 4
88 25 4
91 24 4
93 21 4
94 22 4
94 19 4
95 18 4
97 20 4];
scatter(a(:,1),a(:,2),[],a(:,3),'filled','s')

Accepted Answer

Rik
Rik on 31 Oct 2023
As the documentation explains, you can set the colormap:
a = [37 98 1; 35 94 1; 33 97 1; 33 99 1; 31 96 1; 30 97 1; 29 100 1; 30 94 1; 31 90 1; 28 93 1; 21 63 1; 20 61 1; 22 60 1; 24 60 1; 24 64 1; 27 62 1; 28 65 1; 27 59 1; 23 57 1; 26 56 1; 27 57 1; 29 57 1; 31 60 1; 31 61 1; 31 64 1; 32 66 1; 36 60 1; 37 56 -1; 32 56 1; 31 54 1; 27 53 1; 13 43 2; 17 42 2; 17 40 2; 19 37 2; 14 40 2; 13 42 2; 10 41 2; 10 42 2; 9 39 2; 6 40 2; 25 20 3; 24 18 3; 26 18 3; 27 19 3; 27 21 3; 29 21 3; 30 22 3; 30 23 3; 31 26 3; 33 27 3; 35 28 3; 94 11 4; 95 10 4; 97 8 4; 94 8 4; 93 8 4; 99 12 4; 97 12 4; 98 15 4; 95 14 4; 91 15 4; 92 17 4; 91 19 4; 89 19 4; 87 21 4; 89 22 4; 86 23 4; 84 25 4; 81 25 4; 80 26 4; 82 26 4; 79 29 4; 82 29 4; 83 29 4; 86 28 4; 88 25 4; 91 24 4; 93 21 4; 94 22 4; 94 19 4; 95 18 4; 97 20 4];
scatter(a(:,1),a(:,2),[],a(:,3),'filled','s')
colormap('turbo')

More Answers (1)

Image Analyst
Image Analyst on 31 Oct 2023
You should not be using scatter. You should be using gscatter (if you have the stats toolbox) which has the capability you are asking for.
  1 Comment
Sim
Sim on 31 Oct 2023
Edited: Sim on 31 Oct 2023
Thanks a lot @Image Analyst! Yes, I can use it, many thanks! :-)

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