R | Slicing and Extracting Data

Indexing Vectors

• x[n] nth element
• x[-n] all but the nth element
• x[1:n] first n elements
• x[-(1:n)] elements from n+1 to the end
• x[c(1,4,2)] specific elements
• x[“name”] element named “name”
• x[x > 3] all elements greater than 3
• x[x > 3 & x < 5] all elements between 3 and 5
• x[x %in% c(“a”,”and”,”the”)] elements in the given set

Indexing Lists

• x[n] list with elements n
• x[[n]] nth element of the list
• x[[“name”]] element of the list named “name”
• xname id