Suppose I have a matrix like

A=matrix(0,4,6)
A[1,]=c(16,10,2,4,8,7)
A[2,]=c(16,10,12,14,8,7)
A[3,]=c(16,10,13,15,19,17)
A[4,]=c(16,9,13,15,9,7)

> A
     [,1] [,2] [,3] [,4] [,5] [,6]
[1,]   16   10    2    4    8    7
[2,]   16   10   12   14    8    7
[3,]   16   10   13   15    19    17
[4,]   16    9   13   15    9    7
I want to creat an indicator variable X which takes three values:

X=1 if any of A[,2] to A[,4] is less than 10; for example, A[1,] and A[4,]
is this group;
X=2 if not the above but any of A[,5] to A[,6] is less than 10; for example,
A[2,] is this group;
X=3 if none of the above; for example, A[3,] belongs here.

I wonder how to implement this fast in R?

	[[alternative HTML version deleted]]

