[R] Binning a 2 column matrix by avarages of rows.

[ali_protocol]

Newbie here.  Many apologies in advance for using the incorrect lingo. 
I'm new to statistics and VERY new to R.
I have a "nx2" matrix , I want to sort the values based on the average of 2
columns and put k lowest (or highest) values in bin1, second k high/low
values in bin2, and so on (bins would be of the same dimensions). I should
also know what the first index (or position) of the pair has been.


car-1	29	30
car-2	22	24
car-3	16	16
car-4	41	41
car-5	43	45
car-6	34	36

for exmample in bins of 2x2

bin1
car-3	16	16
car-2	22	24
bin2
car-1	29	30
car-6	34	35
bin3
car-4	41	41
car-5	43	45

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