How to Plot Lines Between Coordinate Pairs

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Ricky 2014 年 2 月 26 日
I've spent quite a while searching the forums, re-reading answers, testing peoples replies and supposed solutions.... but can't get to the answer to this and it's driving me mad. A much simplified version of the problem is:
Consider two arrays: a=[1,1;1,2;1,3;1,4]
b=[2,1;2,2;2,3;2,4]
The pairs of co-ordinates are on each row, i.e. (1,1) is paired with (2,1), (1,2) with (2,2) etc. How do we join these pairs create 4 horizontal lines, without using loops.
We do NOT want a line from, e.g. (2,1) to (1,2) as this pair does not exist.
The following loop does the job: for i=1:4
plot([a(i,1),b(i,1)],[a(i,2),b(i,2)])
hold on
end
Replacing the 'i' with a ':' doesn't work, it draws two vertical lines! I'm thinking there should be a one line, vectorised answer, but I can't figure it out. Thanks in advance...

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