How to: Merging multiple graph lines
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Hello Guys,
my problem is that I have several data sets of different x-Arrays and always the same y-Array. Basically my plot functions looks like this: plot(x1,y,'g',x2,y,'b'....)
As I have drawn in the picture I want to merge all the lines as to always keep the lowest y-values going from left to right in terms of x-values. This should creat one single new plot that looks like the black line in the right picture. The left picture demonstrates the overlapping data sets.
Can I solve this problem graphically, e.g. using a plotting function to always display the lowest y-value or do I need to create a new 2D array that always picks the lowest y-value for every x- value? Maybe you can give me a base to start from. Sorry about my "untechnical" explanation, Im new to Matlab and coding in general.
Thanks in advance for your support. Pat
2 Comments
Guillaume
on 18 Oct 2014
It looks like you meant to attach or (better) embed a figure, but seems like you forgot
Accepted Answer
Guillaume
on 20 Oct 2014
Edited: Guillaume
on 20 Oct 2014
I would concatenate all your x, get the unique values and their position and use the position with accumarray to get the minimum of y:
xall = [x1 x2 x3 ...];
[x, ~, indices] = unique(xall);
y = accumarray(indices, repmat(y, 1, N)', [], @min); %where N is the number of xi
plot(x, y);
edited for missing comma
10 Comments
More Answers (1)
Rick Rosson
on 18 Oct 2014
x = [ x1 x2 x3 ... ];
N = length(x)/length(y);
y = repmat(y,1,N);
plot(x,y);
2 Comments
vi trung kien
on 21 Mar 2018
Edited: vi trung kien
on 21 Mar 2018
Dear Patrick, Can you suggest for me how to get one single united line that always displays Ymin(n), like you have scratched in the pictures attached.My problem the same as you before. Thanks for your help.
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