Any numbers inside the parentheses of c() will be joined together to form the vector. To set a variable to a vector you would use a variable name such as x and call it like x <- c(4, 6, 9).

How to call c(), concatenate function in R

To create a join together numbers to create a vector, you can use c(). 

University of Michigan - Ann Arbor

List of functions in R

James, G., Witten, D., Hastie, T., & Tibshirani, R. (2013). An introduction to statistical learning (Vol. 112, pp. 3-7). New York: springer.

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