Extract indices from array meeting a condition in R

Question

Say I have d<-c(1,2,3,4,5,6,6,7). How can I select the indices from d that meet a certain condition such as x>3 and x<=6 (i.e. d[4], d[5], d[6], d[7])?

Answer 1

Use which

> which(d>3 & d<=6)
[1] 4 5 6 7