Change colors (of groups) in scatter plot

Question

Sim 2023-10-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2040906-change-colors-of-groups-in-scatter-plot

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
   94      1
   97      1
   99      1
   96      1
   97      1
  100      1
   94      1
   90      1
   93      1
   63      1
   61      1
   60      1
   60      1
   64      1
   62      1
   65      1
   59      1
   57      1
   56      1
   57      1
   57      1
   60      1
   61      1
   64      1
   66      1
   60      1
   56     -1
   56      1
   54      1
   53      1
   43      2
   42      2
   40      2
   37      2
   40      2
   42      2
   41      2
   42      2
   39      2
   40      2
   20      3
   18      3
   18      3
   19      3
   21      3
   21      3
   22      3
   23      3
   26      3
   27      3
   28      3
   11      4
   10      4
    8      4
    8      4
    8      4
   12      4
   12      4
   15      4
   14      4
   15      4
   17      4
   19      4
   19      4
   21      4
   22      4
   23      4
   25      4
   25      4
   26      4
   26      4
   29      4
   29      4
   29      4
   28      4
   25      4
   24      4
   21      4
   22      4
   19      4
   18      4
   20      4];
scatter(a(:,1),a(:,2),[],a(:,3),'filled','s')

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Answer 1

Rik 2023-10-31

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2040906-change-colors-of-groups-in-scatter-plot#answer_1344041

在 MATLAB Online 中打开

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')