plot the lines with different color

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?

Answer 1

[Image Analyst]

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')

[wei ong]

Thanks @Image Analyst, the rescale tool works like a cham. It took me a while to understand its function. really appreicate your help !