Time arithmetics with “zoo” objects 

options(jupyter.rich_display=FALSE) # Create output as usual in R

The following makes use of the zoo package. You may need to install it from CRAN using the code install.packages("zoo") if you want to run this on your computer. (The package is already installed on the notebook container, however.)

library(zoo)

Attaching package: ‘zoo’


The following objects are masked from ‘package:base’:

    as.Date, as.Date.numeric

The file “zpresidents.RData” was created in an earlier example.

load("zpresidents.RData")

zpresidents_1 <- zpresidents[1:4]
zpresidents_2 <- zpresidents[3:6]
zpresidents_1 + zpresidents_2

1945 Q3 1945 Q4 
    164     150 

presidents_1 <- presidents[1:4]
presidents_2 <- presidents[3:6]
presidents_1 + presidents_2

[1]  NA 162 145 125