Count number of vector values in range with R

Try

> sum(v > 2 & v < 5)

r vector comparison

There are also the %<% and %<=% comparison operators in the TeachingDemos package which allow you to do this like:

sum( 2 %<% x %<% 5 )sum( 2 %<=% x %<=% 5 )

which gives the same results as:

sum( 2 < x & x < 5 )sum( 2 <= x & x <= 5 )

Which is better is probably more a matter of personal preference.

r vector comparison

Use which:

 set.seed(1) x <- sample(10, 50, replace = TRUE) length(which(x > 3 & x < 5)) # [1]  6

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