Exercise

Select elements in objects

This exercise focuses on extracting different elements from objects in R. Your workspace environment includes the objects created previously: two numeric vectors numvec1 and numvec2, one character vector charvec, a matrix nummtx, and a dataframe dataframe. Type the name of each object in the console to view them again if you wish. The dplyr package is also loaded.

You will get experience selecting elements from each type of object (vector, matrix, and dataframe).

Instructions

100 XP

Select the 2nd element in vector charvec
Select the 2nd column of matrix nummtx
Pull column numvec1 from dataframe dataframe assign it to an object named id
Pull column charvec from dataframe dataframe determine the class of charvec