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class: center, middle, title

# UE Visualisation

### 2019-2020

## Dr. Maxime Wack

### AHU Informatique médicale
#### Hôpital Européen Georges Pompidou, &lt;/br&gt; Université de Paris

---

# Données tabulaires

.center[Chargement des données avec `read_csv`]


```r
read_csv("lab03_data/notes.csv") -&gt; notes
```

<div id="htmlwidget-94c0f5d1381e56fb5881" style="width:100%;height:auto;" class="datatables html-widget"></div>
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---

# Pivot

.center[Données *wide* → *long*]


```r
pivot_longer(notes,
             Alice:David,
             names_to = "Prénom",
             values_to = "Note") -&gt; notes_long
```

<div id="htmlwidget-3265d78dc11fed97ef02" style="width:100%;height:auto;" class="datatables html-widget"></div>
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---

# Pivot

.center[Données *long* → *wide*]


```r
pivot_wider(notes_long,
            names_from = Prénom,
            values_from = Note)
```

<div id="htmlwidget-1496fd73ac98b39c4291" style="width:100%;height:auto;" class="datatables html-widget"></div>
<script type="application/json" data-for="htmlwidget-1496fd73ac98b39c4291">{"x":{"filter":"none","data":[["1/1/2019","1/15/2019","2/1/2019","2/15/2019","3/1/2019","3/15/2019","4/1/2019","4/15/2019","5/1/2019","5/15/2019"],[14,16,15,17,14,15,13,15,16,17],[10,11,11,10,15,13,12,12,13,11],[18,19,18,19,19,20,19,19,17,18],[9,10,12,11,14,13,14,15,14,15]],"container":"<table class=\"display\">\n  <thead>\n    <tr>\n      <th>Date<\/th>\n      <th>Alice<\/th>\n      <th>Bob<\/th>\n      <th>Claire<\/th>\n      <th>David<\/th>\n    <\/tr>\n  <\/thead>\n<\/table>","options":{"paging":false,"info":false,"searching":false,"columnDefs":[{"className":"dt-right","targets":[1,2,3,4]}],"order":[],"autoWidth":false,"orderClasses":false}},"evals":[],"jsHooks":[]}</script>

---

# Exercices

Utiliser les fonctions de `pivot_*` pour exprimer le dataset `gapminder` de différentes manières.

### Représenter l'intégralité sous forme clé-valeur

Chaque ligne ne doit porter qu'une valeur de `lifeExp`, `gdpPercap` ou `pop`, pour chaque pays et chaque année.

### Représenter un pays par ligne

Une seule ligne par pays, toutes les années × indicateur doivent donner lieu à une nouvelle colonne

### Reformer gapminder à partir du précédent exercice
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