zipR vignette

Leslie Huang

2018-11-02

Introducing zipR: zip() for R

zip() is an incredibly handy built-in function in Python. Unlike many other great Python features/structures (such as iterators, generators, and dictionaries), zip() is relatively easy to implement in R. Here is a brief introduction to zipR.

This is a work in progress! For bugs and features, please open an issue on GitHub.

Loading the library

#> Downloading GitHub repo leslie-huang/zipR@master
#> from URL https://api.github.com/repos/leslie-huang/zipR/zipball/master
#> Installing zipR
#> '/Library/Frameworks/R.framework/Resources/bin/R' --no-site-file  \
#>   --no-environ --no-save --no-restore --quiet CMD INSTALL  \
#>   '/private/var/folders/w3/gyjcgdsx15vc8y_zdl2rd2bh0000gn/T/RtmpFUnUVK/devtools515224219fb4/leslie-huang-zipR-e605ea3'  \
#>   --library='/private/var/folders/w3/gyjcgdsx15vc8y_zdl2rd2bh0000gn/T/RtmpjDQBvu/Rinst514240e5d6df'  \
#>   --install-tests
#> 

Dummy data

Some sequences of different lengths, in order to test the different options available in zipr.

a <- c(1,2,3)
b <- c(4,5,6)
c <- c(1,2,3,4,5,6)
d <- c(7,8)
z <- c(9)
filler <- c(NA)

zip two vectors of the same length

zipR::zipr(a,b)
#>   x y
#> 1 1 4
#> 2 2 5
#> 3 3 6

zip two vectors of different lengths, repeating the shorter vector

broadcast = TRUE repeats elements of the shorter vector so that it is the same length as the longer vector

zipr(a, z, broadcast = TRUE)
#>   x y
#> 1 1 9
#> 2 2 9
#> 3 3 9

zipr(a, c, broadcast = TRUE)
#>   x y
#> 1 1 1
#> 2 2 2
#> 3 3 3
#> 4 1 4
#> 5 2 5
#> 6 3 6

zip two vectors of different lengths, using the default fill value

fill = TRUE without a fillvalue specified fills in the shorter vector with NA

zipr(z, a, fill = TRUE)
#>    x y
#> 1  9 1
#> 2 NA 2
#> 3 NA 3

zip two vectors of different lengths, using a custom fill value

zipr(c,a, fill = TRUE, fillvalue = z)
#>   x y
#> 1 1 1
#> 2 2 2
#> 3 3 3
#> 4 4 9
#> 5 5 9
#> 6 6 9

zipr(c,z, fill = TRUE, fillvalue = d)
#>   x y
#> 1 1 9
#> 2 2 7
#> 3 3 8
#> 4 4 7
#> 5 5 8
#> 6 6 7