How to select only the rows that contain a number in column b.
a <- c(1,5,3,1,-8,6,-1)
b <- c(4,-2,1,0,"c",2,"DX")
df <- data.frame(a,b)
df
# a b
# 1 1 4
# 2 5 -2
# 3 3 1
# 4 1 0
# 5 -8 c
# 6 6 2
# 7 -1 DX
The output should look like this:
# a b
# 1 1 4
# 2 5 -2
# 3 3 1
# 4 1 0
# 5 6 2