How to know in which position an unknown is located in a vector?

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1

Example: 

a=c(10,9,8,7)
b<-max(a)
a[b]

I need to know in which position b is located in vector a, R must return 1 (which is the answer)

r

2 answers

4


Take a look at the function which():

a=c(10,9,8,7)
b<-max(a)
a[b]
which(a == b)
# [1] 1

Other options is the function match():

match(b, a)
# [1] 1

  • Thank you very much, I am in the middle of a gigantic code for a job and did not know of this basic command! Grateful!

4

Another way to solve is with the function which.max:

a=c(10,9,8,7)
which.max(a)
[1] 1

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