I have two vectors for values collected from a group of subjects, say

a=c(100,200,150,120,140,180)

b=c(200,300,420,130)

I also have two vectors which indicate the corresponding subjects for a and
b, say

for a, the subjects are

suba=c(1,2,3,4,5,6)

for b, the subjects are

subb=c(1,3,5,6)

Then, I want to find out the paired values from a and b, such as (100, 200)
(from subject 1), (150,300) (from subject 3), (140, 420) (from subject 5)
.....

How can I do this in R? Can somebody drop a hint here?

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