plot the lines with different color

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wei ong
wei ong 2022-6-6
评论： wei ong 2022-6-6
Dear all,
I have generated a plot using x and y and would like to add color on it based on its value (diameter of line). I have used the https://github.com/vistalab/vistateach/blob/master/cogneuro/tutorial1_timeseries/vals2colormap.m
to convert my range of value to rgb value
x = [0.168149323 0.547990492 0.580721962 0.502272216 0.321295719 0.168149323];
y = [0.565541486 0.530969047 0.570321397 0.878624621 1.069086578 0.565541486];
colorrange=[27.65 22.11 23.11 25.11 26.74 26.94]
rgb=vals2colormap(colorrange, 'jet',[22.11 27.65])
%rgb=[0.5,0,0;0,0,0.515625;0,0.234375,1;0.671875,1,0.3281250;1,0.15625,0;1,0.015625,0]
%rgb is colormap value for different line
for k = 1 : length(rgb)
hold on
% Get new values.
plot(x, y,'-', 'Color', rgb(k,:) ,'LineWidth',2)
end
however, when I plot them out, all the color are the same.
any idea I can make different line to different color based on their specific value?

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采纳的回答

Image Analyst
Image Analyst 2022-6-6
Ran in:
Try this:
x = [0.168149323 0.547990492 0.580721962 0.502272216 0.321295719 0.168149323];
y = [0.565541486 0.530969047 0.570321397 0.878624621 1.069086578 0.565541486];
numColors = numel(x)
numColors = 6
cmap = jet(numColors);
colorrange=[27.65 22.11 23.11 25.11 26.74 26.94]
colorrange = 1×6
27.6500 22.1100 23.1100 25.1100 26.7400 26.9400
cMapIndexes = round(rescale(colorrange, 1, numColors))
cMapIndexes = 1×6
6 1 2 4 5 5
for k = 2 : length(x)
hold on
% Get new values.
thisColor = cmap(cMapIndexes(k),:);
fprintf('Plotting line from point %d to point %d as [%.2f, %.2f, %.2f].\n', ...
k-1, k, thisColor(1), thisColor(2), thisColor(3))
plot([x(k-1), x(k)], [y(k-1), y(k)], '-', 'Color', thisColor ,'LineWidth', 5)
end
Plotting line from point 1 to point 2 as [0.00, 0.00, 1.00]. Plotting line from point 2 to point 3 as [0.00, 0.50, 1.00]. Plotting line from point 3 to point 4 as [0.50, 1.00, 0.50]. Plotting line from point 4 to point 5 as [1.00, 1.00, 0.00]. Plotting line from point 5 to point 6 as [1.00, 1.00, 0.00].
grid on;
xlabel('x');
ylabel('y')
  1 个评论
wei ong
wei ong 2022-6-6
Thanks @Image Analyst, the rescale tool works like a cham. It took me a while to understand its function. really appreicate your help !

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