Change colors (of groups) in scatter plot

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Sim
Sim 2023-10-31
编辑： Sim 2023-10-31
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')

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采纳的回答

Rik
Rik 2023-10-31
Ran in:
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')

更多回答（1 个）

Image Analyst
Image Analyst 2023-10-31
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.

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