Create plot with multiple overlayed lines, where colorbar corresponds to color of line

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my goal is to create a colorbar to represent the colors of data lines plotted on a figure
the color of the lines follow the jet colormap pattern, so I feel this should be possible to do in Matlab.
for example:
time = 0:.1:5; %seconds
A = 10: %number of plots
plotColor = jet(A); %Creates a 10 by 3 matrix of colors transitioning from dark blue to dark red.
figure
for H = 1:A
plot( H*sin(time), 'color', plotColor(:,H) )
hold on
end
In this example I want to have a color bar to represent the height of the sine wave as a function of the color of the lines.
I haven't been able to figure out a way to implement this yet and I would appreciate any help! Thank you in advance.
  1 comentario
Hans123
Hans123 el 22 de Jul. de 2019
The reason you did not get colored plots was because you referenced the newly created color array in the incorrect way - all the rows of column H
plot( H*sin(time), 'color', plotColor(:,H) )
It should be all the columns (RGB) of row H
plot( H*sin(time), 'color', plotColor(H,:) )
Hope that cleared out any confusion

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Hans123
Hans123 el 22 de Jul. de 2019
Editada: Hans123 el 22 de Jul. de 2019
Hope this helps
clc; close; clear
time = 0:0.1:5; %seconds
A = 10; %number of plots
colormap(jet(10))
jetcustom = jet(10);
figure
for H = 1:A
plot(time,H*sin(time), 'Color', jetcustom(H,:))
hold on
end
xlabel('Time (s)')
ylabel ('Your Y label')
colormap(jet(10))
cb = colorbar;
caxis([-10 10])
ylabel(cb,'Height')

Más respuestas (1)

Adam Danz
Adam Danz el 9 de Oct. de 2019
Editada: Adam Danz el 10 de Oct. de 2019
In addition to Hans' method, you can also apply the colorbar based on whatever line colors are already set up in the "ColorOrder" property of your axes.
% Create demo plot
figure()
hold on
for i = 1:15
plot([0,1],[i,i],'-','LineWidth',2)
end
% Get the axis handle and the number of lines drawn
% Usually you can skip this step because you already have
% these two variables.
axh = gca();
nLines = length(findall(axh,'Type','line'));
% Produce a colormap based on the ColorOrder of the axis
cmap = axh.ColorOrder;
cmap = repmat(cmap, ceil(nLines/size(cmap,1)), 1);
colormap(axh,cmap(1:nLines,:));
cbh = colorbar();
caxis([1,nLines+1]) % tick number 'n' is at the bottom of the n_th color
ylabel(cbh,'Line number')
  2 comentarios
Shashank Pathrudkar
Shashank Pathrudkar el 7 de Feb. de 2023
Hello Adam,
for scatter: scatter(x,y,sz,c) specifies the circle colors. You can specify one color for all the circles, or you can vary the color. For example, you can plot all red circles by specifying c as "red".
Where if I give c as an vector of length equal to x and y, I get the points colored according to the values in c.
Is there any such option for plot?
Example:
figure; plot(randn(100,5)) % this will plot 5 signals of length 100
Now I want colors for these signals based on another vectorr, say c = [0.1 4 2.5 3 10]
Adam Danz
Adam Danz el 7 de Feb. de 2023
The plot function does not have an option to specify groups of colors. However, there are two relatively easy ways to accomplish this.
Set axis ColorOrder
When not defined by the user, line color is determined by the axis ColorOrder property.
Either set it before adding the line objects,
figure()
ax = axes();
ax.ColorOrder = [1 0 0; 0 1 0; 0 0 1; 1 1 0; 0 1 1];
hold on % important
plot(rand(100,5)+(1:5), 'o')
or after adding the line objects,
figure()
ax = axes();
plot(rand(100,5)+(1:5), 'o')
ax.ColorOrder = [1 0 0; 0 1 0; 0 0 1; 1 1 0; 0 1 1];
Set the line object color properties
Alternatively, you can directly set the color of the line objects. When you plot an nxm matrix, plot will return m handles.
figure()
h = plot(rand(100,5)+(1:5), 'o')
h =
5×1 Line array: Line Line Line Line Line
colors = [1 0 0; 0 1 0; 0 0 1; 1 1 0; 0 1 1];
for i = 1:numel(h)
h(i).Color = colors(i,:);
end

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