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Make it clear that dataframes are immutable #924

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Merged
merged 2 commits into from
Nov 15, 2024
Merged

Make it clear that dataframes are immutable #924

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93d12b8
Make it clear that dataframes are immutable
dmcg Oct 16, 2024
9269636
fixed typo
Jolanrensen Nov 15, 2024
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10 changes: 5 additions & 5 deletions docs/StardustDocs/topics/overview.md
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Expand Up @@ -55,16 +55,16 @@ val df = DataFrame.readCSV("titanic.csv", delimiter = ';')

```kotlin
// filter rows
df.filter { survived && home.endsWith("NY") && age in 10..20 }
val someSurvivors = df.filter { survived && home.endsWith("NY") && age in 10..20 }

// add column
df.add("birthYear") { 1912 - age }
val withBirthYearColumn = df.add("birthYear") { 1912 - age }

// sort rows
df.sortByDesc { age }
val sortedByAge = df.sortByDesc { age }

// aggregate data
df.groupBy { pclass }.aggregate {
val aggregated = df.groupBy { pclass }.aggregate {
maxBy { age }.name into "oldest person"
count { survived } into "survived"
}
Expand Down Expand Up @@ -119,7 +119,7 @@ val dfClean = df
**Aggregate:**
```kotlin
// group by flight origin
dfClean.groupBy { From into "origin" }.aggregate {
val analysed = dfClean.groupBy { From into "origin" }.aggregate {
// we are in the context of single data group

// number of flights from origin
Expand Down