CODEWITHSUNDEEP
r
user1079898
user1079898

Reputation: 737

Comparing vectors

I would like to test the following: for each value in x1 test if it falls between x2 and x3. Basically if x2$x2 < x1 < x2$x3 is true return the values of x1 where it's true. In this case they will all be true. I am confused if I should write a function or if there is something inbuilt to do this?

x1 <- data.frame(x1=11:20, stringsAsFactors=FALSE)
> x1
   x1
1  11
2  12
3  13
4  14
5  15
6  16
7  17
8  18
9  19
10 20

x2 <- 1:10
x3 <- 21:30
x2 <- data.frame(x2, x3, stringsAsFactors=FALSE)

> x2
   x2 x3
1   1 21
2   2 22
3   3 23
4   4 24
5   5 25
6   6 26
7   7 27
8   8 28
9   9 29
10 10 30

Upvotes: 1

Views: 177

Answers (1)

Edward
Edward

Reputation: 5537

Try the following:

x1$x1[which(x1$x1 > x2$x2 & x1$x1 < x2$x3)]

which returns a vector of indices for which the equation (in this case, x1$x1 > x2$x2 & x1$x1 < x2$x3 holds true. We then select the right elements using x1$x1[indices].

Note the use of & instead of && in the inequality, as you are working with vectors and not individual elements.

Upvotes: 2

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