Unique color for every plot line

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Jesse
Jesse on 8 Nov 2018
Commented: Jesse on 9 Nov 2018
To identify every line in a legend i want it to have a unique color.
as you can see, is already tried some. I'm still learning to use Matlab, so excuse me for my bad coding...
clear vars
close all
load 'Y:\Geovib\08\matlab.mat';
%afstand = '10m'; node='n201'; rij=2;
%afstand = '10.8m'; node='n202'; rij=3
%fstand = '11.6m'; node='n203'; rij=4;
%afstand = '12.7m'; node='n204'; rij=5;
%afstand = '13.3m'; node='n205'; rij=6;
%afstand = '14.3m'; node='n206'; rij=7
%afstand = '15.5m'; node='n207'; rij=8
%afstand = '16.8m'; node='n208'; rij=9
%afstand = '18.5m'; node='n209'; rij=10
%afstand = '20m'; node='n210'; rij=11
%afstand = '22m'; node='n211'; rij=12
%afstand = '24m'; node='n212'; rij=13
%afstand = '26.5m'; node='n213'; rij=14
%afstand = '29m'; node='n214'; rij=15
%afstand = '32m'; node='n215'; rij=16
afstand = 'alle'; node='alle';
%afstand = 'test';
%%%%%%%%%%%%%%%
matlab.Properties.VariableNames{1} = 'time';
matlab = removevars(matlab, {'VarName29','VarName27','VarName25','VarName23','VarName21','VarName19','VarName17','VarName15','VarName13','VarName11','VarName9','VarName7','VarName5','VarName3'});
matlab.Properties.VariableNames{2} = 'n201';matlab.Properties.VariableNames{3} = 'n202';matlab.Properties.VariableNames{4} = 'n203';matlab.Properties.VariableNames{5} = 'n204';
matlab.Properties.VariableNames{6} = 'n205';matlab.Properties.VariableNames{7} = 'n206';matlab.Properties.VariableNames{8} = 'n207';matlab.Properties.VariableNames{9} = 'n208';matlab.Properties.VariableNames{10} = 'n209';
matlab.Properties.VariableNames{11} = 'n210';matlab.Properties.VariableNames{13} = 'n212';matlab.Properties.VariableNames{12} = 'n211';
matlab.Properties.VariableNames{14} = 'n213';matlab.Properties.VariableNames{15} = 'n214';matlab.Properties.VariableNames{16} = 'n215';matlab.Properties.VariableNames{16} = 'n215';
matlab.time(2) = 0;
matlab(1,:) = [];
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%vars={'n201','n202','n203','n204','n205','n206','n207','n208','n209','n210','n211','n212','n213','n214','n215'};
vars={'10.0m','10.8m','11.6m','12.7m','13.3m','14.3m','15.5m','16.8m','18.5m','20.0m','22.0m','24.0m','26.5m','29.0m','32.0m'};
if isequal(afstand,'alle')
data_time = table2array(matlab(3:end,2:end));
else
data_time = table2array(matlab(3:end,rij)); %%origineel
vars=node;
end
time = matlab.time(3:end);
data_fft = fft(data_time);
Y = 2*abs(data_fft(2:end/2+1,:));
freqs = 1:1000/2;
figure
subplot(211)
semilogx(freqs,Y)
if isequal(afstand,'alle')
else
title({['Afstand ',afstand, ' - node ',node]});
end
xlabel('frequentie [Hz]')
ylabel('trillingssnelheid(rms) [mm/s]')
colormap(hsv)
legend(vars)
% for i = 1:length(vars)
% legend(i)
% return
%
% end
grid on;
hold on;
axis tight;
xlim([0 100])
ylim([0 0.000040])
%%%Subplot in tijddomein
subplot(212)
%plot(time,data_time(:,1:1:end),'color',rand(1,3)) % je kan ook een aantal lijnen plotten bijv. [1:5:7]
plot(time,data_time)
legend(vars)
colormap(prism)
%legend(unique(vars))
grid on;
axis tight;
hold on;
%ylim([-0.00000043 0.00000055])
clear node rij time Y afstand data_fft matlab2

Accepted Answer

jonas
jonas on 8 Nov 2018
Edited: jonas on 8 Nov 2018
Here's an example that will give you truly unique colors from a colormap of your choice.
% Create 10 data series
XY = rand(100,10)
% Build colormap and shuffle
cmap = colormap(jet(size(XY,2)));
cmap = cmap(randperm(length(cmap)),:)
%Set colororder and plot
ax = axes('colororder',cmap);hold on
plot(XY)
I shuffled the colors (randperm) to make them random in the sense that the lines swap colors every time you plot. If the color has some significance, then you may want to remove that line. For example, you could design your plot so that the intensity of the line color represents the "quantity" of each line (10.0m, 10.8m, etc..). However, in that case it may be better to just go for the 3d plot instead :)
  7 Comments
Jesse
Jesse on 9 Nov 2018
Thank you very much! That's the answer i was looking for. Now i can apply this to all my plots. Thanks!

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