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I have two vectors (sets) like this:
first<-c(1,2,3,4,5)
second<-c(2,4,5)
how can I detect that whether second is subset of first or not? is there any function for this?
716
So if you have two instances of the number 99 in vector a, then as long as vector b has at least one instance of the number 99, then it will be declared as a subset.
The way you tell R that you want to select some particular elements (i.e., a 'subset') from a vector is by placing an 'index vector' in square brackets immediately following the name of the vector. For a simple example, try x[1:10] to view the first ten elements of x.
Getting a subvector from a vector in C++ Begin Declare s as vector s(vector const &v, int m, int n) to initialize start and end position of vector to constructor. auto first = v. begin() + m. auto last = v.
The function std::includes() can be used to determine if one set is a subset of another. The function returns true if and only if each distinct element in the second sorted range has a corresponding distinct element in the first sorted range to which it compares equal.
Here's one way
> all(second %in% first)
[1] TRUE
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