# How to find two points with same x coordinate when two graphs are plotted in a same plot?

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SHRUTHI k am 15 Apr. 2016
Beantwortet: Meade am 20 Apr. 2016
Hello everyone. I need a help from you all. I am trying to plot two different graphs (say G1 and G2) in a same plot using hold on command. Now, I have marked a point on G1 say P1(x,y). I want to find the point P2(x,y) on the other graph G2 for same x coordinate. What commands I can use to achieve this? I hope my question is clear to you and can anyone please help me? Thanks in advance.
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### Antworten (1)

Give this a shot:
n = 1% The number of identical 'x' coordinates you want to find, delete "n" to find them all
idx = find(G2(:,1) == P1(1,1),n); % Finds the idx of the points in G2 matching P1(x)
P2 = G2(idx,:) % Assigns all matching points in G2 to P2;
or more concisely:
P2 = G2(G2(:,1) == P1(1,1),:)
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