Multiple lines in one graph

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John Hey
John Hey 2018-3-9
编辑： Stephen23 2018-3-10
Dear All,
I am drawing several lines on one graph and I would like to make them thicker where they coincide. All advice gratefully accepted.
John Hey
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Stephen23
Stephen23 2018-3-9
@John Hey: do all of the plotted lines use exactly the same X values?
John Hey
John Hey 2018-3-9
Stephen, Yes - they do. Does that help? John

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Stephen23
Stephen23 2018-3-10
编辑：Stephen23 2018-3-10
Here is one solution using NaN's to mask out parts of the lines, and plotting them for each thickness. For this to work it is also required to interpolate the data (try it without to see the difference). I don't claim that this is very efficient, but for a small number of lines and nodes it will work.
Xi = [1;2;3;4;5;6];
Yi = [1,2,2,2,1,1;2,2,2,2,3,4;3,3,3,3,3,4;4,3,3,3,4,5;5,5,2,2,4,4].';
plot(Xi,Yi,'LineWidth',3)
hold on
ylim([0,6])
N = numel(Xi);
Xo = interp1(1:N,Xi,1:0.5:N);
Yo = interp1(1:N,Yi,1:0.5:N);
D = bsxfun(@minus,Yo,permute(Yo,[1,3,2]))==0;
D = D(1:end-1,:,:) & D(2:end,:,:);
D = convn(D,[1;1])>0;
S = sum(D,3);
for k = 2:max(S(:))
Yo(S<k) = NaN;
plot(Xo,Yo,'k','LineWidth',k*3)
end
Giving:
You can adjust the colors and line thickness as you see fit. With some effort you could simplify and make it more efficient (e.g. remove columns with all NaN, or use indexing to extract only the non-NaN portions of M and plot only them).

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elham kreem
elham kreem 2018-3-9
let
y = 1:2:40
x1=4:2:43
x2 = 8:3:66
x3 = 1:4:80
figure ;
plot( x1 , y , ' r ' , x2 , y , ' b--o' , x3,y , 'g-*')

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