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Plotting 2D curves with specific colors for certain curves

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H H
H H on 7 Sep 2021
Commented: H H on 7 Sep 2021
Hi all. I have 1000 simple 2D curves (data = rand(1000,20)). X axis for all is from (x=1:20). Each curve has an index between 1 to 7 (idx=randi([1 7], 1000,1)) . How can I quickly plot these curves alltogether in a single plot such that the curves with similar idx share the same color?
Thank you.
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Accepted Answer

Image Analyst
Image Analyst on 7 Sep 2021
Try this:
numCurves = 1000;
data = rand(numCurves,20);
% X axis for all is from
x = 1 : 20;
% Each curve has an index between 1 to 7
idx = randi([1 7], numCurves, 1);
customColorMap = jet(max(idx));
for k = 1 : size(data, 1)
thisColor = customColorMap(idx(k), :);
fprintf('Drawing line %d in [%.3f, %.3f, %.3f].\n', ...
k, thisColor(1), thisColor(2), thisColor(3));
plot(x, data(k, :), '-', 'Color', thisColor, 'LineWidth', 2);
hold on;
% Occasionally refresh the screen.
if rem(k, 50)
drawnow;
end
end
grid on;

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