Is there a way to build a defined set of colors which the gscatter command to accept?

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Earlier this year I built a MATLAB script which produces group scatter plots for up to 8 data sets. This is a sample of that code;
% Setup the group scatter plot
figure('Name','Measured Values');
colors = 'rgbcmykw'; % MATLAB’s default predefined color spec
h = gscatter(T_Time, Rad_Val, Leg_Nom, colors, 'o', 15, 'on');
for n = 1:length(h)
set(h(n), 'MarkerFaceColor', colors(n));
% Change the semilog labels to decimal units
New_YTickLabel = get(gca,'Ytick');
This code works well for the most part. The drawback being an 8th data set plotted in white (where I manually change the color from white to grey).
But now I’ve been asked to modify this code to account for up to 12 data sets. Knowing that there are only 8 pre-defined colors, I suspected MATLAB would throw an error since the number of data sets exceeds the number of available colors. And it did. The exact error reads as follows:
Index exceeds matrix dimensions
It points to this line of code: set(h(n), 'MarkerFaceColor', colors(n));
Since there are only 8 pre-defined, hard coded colors in MATLAB, I’m looking for a method/technique to build a pallet of 12 colors. These 12 colors would be used by the gscatter command and in the for loop.
Can this be done?

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Walter Roberson
Walter Roberson 2014년 3월 31일
Instead of using a color name letter, use an RGB vector.
colors = [1 0 0; 0 1 0; 0 0 1; 0 1 1; 1 1 0; 1 0 1; 0 0 0; 1 1 1 ...] %recheck the values
set(h(n), 'MarkerFaceColor, colors(n,:))
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Image Analyst
Image Analyst 2014년 3월 31일
You can use a whole bunch of pre-named colormaps if you want, for example, make colormap with 100 colors:
colors = jet(100); % Or can use hot, winter, cool, autumn, etc.....

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