Check out example codes for "r find elements in common between vectors". It will help you in understanding the concepts better.

Code Example 1

# Basic syntax:
intersect(vector_1, vector_2) # For two vectors
Reduce(intersect, list(vector_1, vector_2, vector_3)) # For multiple vectors

# Example usage:
vector_1 = c(1,2,3,4,5)
vector_1 = c(2,4,6,8)
intersect(vector_1, vector_2)
--> 2 4

# Note, the vectors don't have to have the same length

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