November 2024
Intermediate to advanced
578 pages
14h 25m
French
book
R pour la science des données, 2e édition
by Hadley Wickham, Mine Cetinkaya-Rundel, Garrett Grolemund
Content preview from R pour la science des données, 2e édition
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Chapitre 26. L'itération
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Introduction
Dans ce chapitre, tu apprendras des outils pour l'itération, c'est-à-dire l'exécution répétée de la même action sur différents objets. L'itération dans R a généralement tendance à se présenter différemment des autres langages de programmation parce qu'une grande partie est implicite et que nous l'obtenons gratuitement. Par exemple, si tu veux doubler un tableau numérique x dans R, tu peux simplement écrire 2 * x. Dans la plupart des autres langages, tu devrais doubler explicitement chaque élément de x en utilisant une sorte de boucle for.
Ce livre t'a déjà donné un nombre restreint mais puissant d'outils qui effectuent la même action pour plusieurs "choses" :
-
facet_wrap()etfacet_grid()dessine un graphique pour chaque sous-ensemble. -
group_by()plussummarize()calcule un résumé statistique pour chaque sous-ensemble. -
unnest_wider()etunnest_longer()créer de nouvelles lignes et colonnes pour chaque élément d'une colonne de liste.
Il est maintenant temps d'apprendre des outils plus généraux, souvent appelés outils de programmation fonctionnelle parce qu'ils sont construits autour de fonctions qui prennent d'autres fonctions comme entrées. L'apprentissage de la programmation fonctionnelle peut facilement dévier vers l'abstrait, mais dans ce chapitre, nous allons garder les choses concrètes en nous concentrant ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.