My questions is in this example I read from my R textbook: test_function = function(x) { x[x<0] = -x[x<0] return(x) } It is designed to return a negative number for all values in a vector, such that is you pass -3, -2, 2, 3 in, as such:   test_function(c(-3,-2,2,3) The out put would be 3 2 2 3 My question is can you explain to me the logic of how this works?

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Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.