Counting the number of elements in vector x which equal any vector element in vector y

Question

I need to count the number of elements in vector x which equal any vector element in vector y.

From here I can count the number of elements in vector x which equal to value in scalar `y with code:

x <- c(4,23,4,23,5,43,54,56,657,67,67,435,
             453,435,324,34,456,56,567,65,34,435, 675)

sum(x == 67)

Question: How to count the number of elements in vector x which equal any vector element in vector y?

@Rushabh Patel why you deleted updated answer? It was working correctly. — vasili111, Nov 22 '19 at 20:36

score 1 · Accepted Answer · answered Nov 22 '19 at 19:25

1

Try length-which-in:

length(which(x %in% y))

answered Nov 22 '19 at 19:25

SmokeyShakers

Rushabh Patel · Answer 2 · 2019-11-22T20:23:22.943

1

You can use:

For All matches use this:

length(na.omit(match(x,y)))

For unique Matches use this:

length(intersect(x,y))

edited Nov 22 '19 at 20:23

answered Nov 22 '19 at 19:54

Rushabh Patel

This code gives the sum of "if element from `y` was matched at least one time in x" and here "several occurrences of `y` in `x` is counted as `1`". – vasili111 Nov 22 '19 at 20:09
@SmokeyShakers I changed my answer. – Rushabh Patel Nov 22 '19 at 20:24

2 Answers2