Iteration is a powerful way to make the computer do the work for you. It can also be an area of coding where it is easy to make lots of typos and simple mistakes. The purrr package helps simplify iteration so you can focus on the next step, instead of finding typos.

Kekuatan iterasi

Pengantar iterasi

Iterasi dengan purrr

Lebih jauh tentang iterasi dengan for loop

Lebih banyak iterasi dengan purrr

Subset list

Struktur list

Mensubset elemen list

Beragam variasi map()

Alternatif argumen map()

map_*

Simplifying Iteration and Lists With purrr

purrr is much more than a for loop; it works well with pipes, we can use it to run models and simulate data, and make nested loops!

Working with unnamed lists

Names & pipe refresher

Setting names

Pipes in map()

More map()

Simulating Data with Purrr

Run a linear model

map_chr()

map_dbl() and map_int()

map2() and pmap()

Simulating data with multiple inputs using map2()

Simulating data 3+ inputs with pmap()

More complex iterations

Like anything in R, understanding how to troubleshoot issues is an important skill set. This can be particularly important with lists, where finding the problem can be tricky.

How to purrr safely()

safely() replace with NA

Convert data to numeric with purrr

Finding the problem areas

Another way to possibly() purrr

Replace safely() with possibly()

Convert values with possibly()

purrr is a walk() in the park

Comparing walk() vs. no walk() outputs

walk() for printing cleaner list outputs

Troubleshooting lists with purrr

Now that you have the building blocks, we will start tackling some more complex data problems with purrr.

Using purrr in your workflow

Name review

Asking questions from a list

Even more complex problems

Questions about gh_repos

Graphs in purrr

ggplot() refresher

purrr and scatterplots

purrr and histograms

Wrap Up

Problem solving with purrr

Simulated data 1990-2005

List bisa sulit untuk dipahami dan dimanipulasi, namun dapat memuat banyak informasi dan sangat kuat. Di kursus ini, Anda akan belajar mengekstrak, merangkum, dan memanipulasi list dengan mudah serta mengekspor datanya ke objek yang Anda inginkan, baik ke list lain, vektor, atau yang lainnya! Sepanjang kursus, Anda akan bekerja dengan paket purrr dan berbagai himpunan data dari paket repurrrsive, termasuk data dari film Star Wars dan Wes Anderson serta data tentang pengguna GitHub dan repos GitHub. Setelah mengikuti kursus ini, kemampuan Anda mengolah list akan menjadi purrrfect!

Introduction to the Tidyverse

Intermediate R

Pelajari cara menggunakan paket purrr dan repurrrsive untuk mengelola, meringkas, dan memecahkan daftar.

Dasar-dasar Functional Programming dengan purrr

Pelajari cara dengan mudah merangkum dan memanipulasi daftar menggunakan paket purrr.

Kotak Alat Tidyverse Tingkat Menengah

Pengembang R

map_*

Dasar-dasar Functional Programming dengan purrr

Latihan interaktif praktis