find the index of the smallest or biggest number in a vetor or data.frame

Dear R experts,

How to find out the index of minimum or maxmum number in a vetor or
data.frame?

For example,

a=

n   price
1     50
-2    100
0    200
-1   300
......


I want to find out the row which the n is the smallest or largestest and
extract the price.


Thanks

Ted

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