assign specific colors to data in plot

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Amir Topaz
Amir Topaz 2021-2-6
评论： Amir Topaz 2021-2-7
I am trying to assign to a scatter graph 3 specific colors,
I created an array with an assigned value (1,2 and 3) for each color, and it sort of worked, only that the colors selected were not my choice. I want my colors to be green, red and blue, and so far I cant figure out how to do it.
here's the code:
scatter(pressure,temperature,150,color_2,'filled')
color_2 is an array of numbers (e.g. 1, 1, 1, 3, 2, 3, 2, 3, etc..)
as you can see below, it works, only that the colors were not the colors of my choice...
a follow up question: I want to create a legend of my selected colors, and I cant figure that out as well
thanks,
Amir

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回答（1 个）

Walter Roberson
Walter Roberson 2021-2-6
cmap = [0 1 0; 1 0 0; 0 0 1];
cdata = cmap(color_2, :);
scatter(pressure, temperature, 150, cdata, 'filled')
or
cmap = [0 1 0; 1 0 0; 0 0 1];
scatter(pressure, temperature, 150, color_2, 'filled')
colormap(cmap)
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Walter Roberson
Walter Roberson 2021-2-7
Ran in:
You did not have "hold on"
cmap = [0 1 0; 1 0 0; 0 0 1];
hold on
names = {'monday', 'tuesday', 'wednesday'};
for K = 1 : length(names)
SH(K) = scatter(nan, nan, 15, cmap(K,:));
end
legend(SH, names)

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