2D line plot xy with color from z variable
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Hi everyone,
x=TIME, y=S4, z=PRN.
I am trying to make a 2D line plot but I want it to vary in color by z variable. FYI, z variable contain a number from 1-32. Meaning that the data will be as example below:
DAY TIME PRN S4
1 0.00138888888888889 4 0.0668452919508921
1 0.00138888888888889 2 0.0559732347198194
1 0.00208333333333333 4 0.0491661308727868
1 0.00208333333333333 28 0.0379869911285429
1 0.00208333333333333 10 0.0203279197164885
1 0.00208333333333333 2 0.0556284592749356
Here is what I had try but it turns out as one color line plot because I don't know how to custom the line color based on z (PRN).
clear
clc
%___Read data___%
data = readtable("Param_365.xlsx");
%___Define variable___%
%DAY = data.DAY;
TIME = data.TIME;
S4 = data.S4;
PRN = data.PRN;
%___Plot scatter 2-D___%
plot(TIME, S4)
%___Axes properities___%
title('Time variation of the S_4 index in 2014');
datetick('x', 'HH');
xlabel('Coordinated Universal Time, UTC (hr)');
ylabel('Amplitude scintillation, S_4');
hold all
I did scatter before and it works but
clear
clc
%___Read data___%
data = readtable("Param_365.xlsx");
%___Define variable___%
%DAY = data.DAY;
TIME = data.TIME;
S4 = data.S4;
PRN = data.PRN;
%___Plot scatter 2-D___%
scatter(TIME, S4, 10, PRN,'filled')
colormap(jet(32))
caxis([1 32]);
colorbar('YTick', [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32]);
%___Axes properities___%
title('Time variation of the S_4 index in 2014');
datetick('x', 'HH');
xlabel('Coordinated Universal Time, UTC (hr)');
ylabel('Amplitude scintillation, S_4');
hold all
But my data will be more appropriate if in the form of line plot as below:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/513867/image.png)
I hope anyone could help me on this because I tried few tricks but it failed. Thank you in advanced.
2 Comments
Answers (3)
Mathieu NOE
on 9 Feb 2021
hello
my 2 cents suggestion
%___Read data___%
data = readtable("Classeur1.xlsx");
%___Define variable___%
%DAY = data.DAY;
TIME = str2double(data.TIME);
S4 = str2double(data.S4);
PRN = data.PRN;
% %___Plot scatter 2-D___%
% scatter(TIME, S4, 10, PRN,'filled')
%
% colormap(jet(32))
% caxis([1 32]);
% colorbar('YTick', [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32]);
% %___Axes properities___%
% title('Time variation of the S_4 index in 2014');
% datetick('x', 'HH');
% xlabel('Coordinated Universal Time, UTC (hr)');
% ylabel('Amplitude scintillation, S_4');
% hold all
% // modified jet-colormap
n = length(PRN);
cd = [uint8(jet(n)*255) uint8(ones(n,1))].' %'
p = plot(TIME, S4, 'LineWidth',4);
title('Time variation of the S_4 index in 2014');
datetick('x', 'HH');
xlabel('Coordinated Universal Time, UTC (hr)');
ylabel('Amplitude scintillation, S_4');
caxis([1 32]);
colormap(jet(32));
cbv=colorbar('v');
set(cbv,'YTick',[1:32],'TickLabels',cellstr(num2str((1:32)')))
drawnow
set(p.Edge, 'ColorBinding','interpolated', 'ColorData',cd)
6 Comments
Mathieu NOE
on 11 Feb 2021
Glad it helps !
I don't have that much merit , simply used the info I found from Yair's undocumented-matlab site
now maybe you could do this plot for a longer period in one graph but this needs first to do some averaging vs time (1 hour basis ? );
Iuliu Ardelean
on 9 Feb 2021
Try this:
x = 1:100;
y = rand(1, 100);
z = randsample(32, 100, true);
figure
hold on
for i = 1:32
plot(x(z==i), y(z==i),'-') % you can assign colors here as you want
% you can also try different markers maybe, if lines are no good?
end
hold off
4 Comments
Iuliu Ardelean
on 10 Feb 2021
Edited: Iuliu Ardelean
on 10 Feb 2021
Or did you mean, how are you going to find the colors from inside S4 subplot?
If that's what you meant then it's pretty easy. Type this in command window:
>> jet(32)
So, your code will look like this:
x = 1:100;
y = rand(1, 100);
z = randsample(32, 100, true);
colors = jet(32);
figure
hold on
for i = 1:32
plot(x(z==i), y(z==i), 'LineWidth',2, 'Color', colors(i,:)) % you can assign colors here as you want
% you can also try different markers maybe, if lines are no good?
end
hold off
And your image will look like this:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/515437/image.png)
Walter Roberson
on 11 Feb 2021
There are three approaches:
- use a surface plot and control edge color
- use a patch() and control edge color.
- use some advanced and obscure internal undocumented properties
There are a couple of File Exchange contribution you can use. One of them is https://www.mathworks.com/matlabcentral/fileexchange/19476-colored-line-or-scatter-plot
Yair's undocumented-matlab site shows how to use the internal undocumented properties.
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