Albert Y. Kim
From 2:30-3:30 only. Also by appointment.
%<>% is a combination of
%>% from the
magrittr package. Ex. the following are the same:
mtcars <- filter(mtcars, gear >3) mtcars %<>% filter(gear > 3)
Imagine we have two data frames x and y:
x1 x2 1 A 1 2 B 2 3 C 3
x1 x3 1 A TRUE 2 B FALSE 3 D TRUE
We want to join them along the
x1 variable and end up with a new data frame that has all three variables.
dplyr's operations to join data sets are inspired by SQL (Structured Query Language), which used to query large databases.
NA's are inserted.
Everybody please ensure that Step 9 in the instructions about LaTeX work. If this doesn't work, please see Rich in his office hours tomorrow or me at some point before class.
Homework 01 will be assigned on Friday.