How do I get graph colors to show as defined?

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Ted H 2023-1-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1893085-how-do-i-get-graph-colors-to-show-as-defined

评论： Cris LaPierre 2023-1-13

I have a table with a variable (my_table.my_config) that holds the configuration names of a component. I added a variable to my table to contain a unique color for each configuration. The configuration variable is categorical, hence the following code:

my_table.my_colors = my_table.my_config;   %copy the configuration categorical, then change to define corresponding colors
my_table.my_colors = renamecats(my_table.mb_colors, {'red', 'green', 'blue', 'black'});

The swarm chart is

figure;
y = swarmchart( my_table.xvar, my_table.yvar, 10, my_table.my_color, 'filled');

The colors are not red, green, blue, and black. Any idea why not?

categories(my_table.my_colors)

ans =
  4×1 cell array
    {'red'  }
    {'green'}
    {'blue' }
    {'black'}

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Ted H 2023-1-12

编辑：Ted H 2023-1-12

Note:

I ran the code in the accepted answer of this thread and got the expected colors.

I followed the example in the section titled Display Filled Markers with Varied Color in the matlab documentation for swarmchart.

Ted H 2023-1-12

在 MATLAB Online 中打开

I think I figured it out.

I revised and added as follows:

my_table.my_colors = my_table.my_config;   %copy the configuration categorical, then change to define corresponding colors
my_table.my_colors = renamecats(my_table.mb_colors, {'1', '2', '3', '4'});
my_table.my_colors = double(my_table.my_colors);
map = [0 0 1
        0 1 0
        1 0 0
        0 0 0];

and the swarmchart becomes

figure;
colormap(map);
y = swarmchart( my_table.xvar, my_table.yvar, 10, my_table.my_color, 'filled');

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Answer 1

Cris LaPierre 2023-1-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1893085-how-do-i-get-graph-colors-to-show-as-defined#answer_1147505

在 MATLAB Online 中打开

The issue is that color name can only be used to specify a single color for all data points. If you want to specify a different color for each point, you must use a numeric value

RGB triplet
matrix of RGB triplets
vector of colormap indices

(see the table here).

If you are particular about the color used, then I suggest predefining the colors, and using group numbers to select the appropriate color. Here's a simple example

my_table = table(randi(2,100,1),randn(100,1),'VariableNames',["xvar","yvar"]);

my_table.my_config = discretize(my_table.yvar,4);

% define colors

colors = [1 0 0; 0 1 0; 0 0 1; 0 0 0];

% use group number from my_config to select rgb triplet

my_table.my_colors = colors(my_table.my_config,:)

my_table = 100×4 table

xvar yvar my_config my_colors ____ ________ _________ ___________ 2 0.1512 3 0 0 1 2 -0.43599 3 0 0 1 2 1.1765 4 0 0 0 2 0.34772 3 0 0 1 1 -0.26273 3 0 0 1 2 -0.40591 3 0 0 1 2 0.19128 3 0 0 1 2 -0.10313 3 0 0 1 2 1.3358 4 0 0 0 1 0.35625 3 0 0 1 1 0.8239 4 0 0 0 1 -0.98383 2 0 1 0 1 -1.1343 2 0 1 0 2 0.37888 3 0 0 1 1 -0.22596 3 0 0 1 2 1.6522 4 0 0 0

s = swarmchart(my_table,'xvar','yvar','filled','ColorVariable','my_colors','SizeData',50);