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Add exercises on moving between vectors and data frames
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@ethanwhite
ethanwhite committed Sep 14, 2020
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4 changes: 2 additions & 2 deletions assignments/r-aggregation-joins.md
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element: assignment
title: Grouping & Joining Data
language: R
exercises: ['Shrub Volume Aggregation', 'Shrub Volume Join', 'Portal Data Aggregation', 'Fix the Code', 'Portal Data Joins', 'REVIEW EXERCISE']
points: [10, 10, 15, 15, 15, 15, 20]
exercises: ['Shrub Volume Aggregation', 'Shrub Volume Join', 'Portal Data Aggregation', 'Fix the Code', 'Portal Data Joins', 'Portal Data dplyr Review', 'Extracting vectors from data frames', 'Building data frames from vectors']
points: [10, 10, 10, 15, 15, 20, 10, 10]
---

#### Learning Objectives
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16 changes: 16 additions & 0 deletions exercises/building-data-frames-from-vectors-R.md
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---
layout: exercise
topic: dplyr
title: Building data frames from vectors
language: R
---

You have data on the length, width, and height of 10 individuals of the yew *Taxus baccata* stored in the following vectors:

```r
length <- c(2.2, 2.1, 2.7, 3.0, 3.1, 2.5, 1.9, 1.1, 3.5, 2.9)
width <- c(1.3, 2.2, 1.5, 4.5, 3.1, NA, 1.8, 0.5, 2.0, 2.7)
height <- c(9.6, 7.6, 2.2, 1.5, 4.0, 3.0, 4.5, 2.3, 7.5, 3.2)
```

Make a data frame with a dataframe that contains this information along with a genus column containing the name *Taxus* on all rows and a species column containing the work *baccata* on all rows.
12 changes: 12 additions & 0 deletions exercises/extracting-vectors-from-data-frames-R.md
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---
layout: exercise
topic: dplyr
title: Extracting vectors from data frames
language: R
---

Using the Portal data `surveys` table:

1. Use `$` to extract the `weight` column into a vector
2. Use `[]` to extract the `month` column into a vector
3. Extract the `hindfoot_length` column into a vector and calculate the hindfoot length ignoring null values.
11 changes: 11 additions & 0 deletions solutions/building-data-frames-from-vectors-R.txt
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genus species length width height
1 Taxus baccata 2.2 1.3 9.6
2 Taxus baccata 2.1 2.2 7.6
3 Taxus baccata 2.7 1.5 2.2
4 Taxus baccata 3.0 4.5 1.5
5 Taxus baccata 3.1 3.1 4.0
6 Taxus baccata 2.5 NA 3.0
7 Taxus baccata 1.9 1.8 4.5
8 Taxus baccata 1.1 0.5 2.3
9 Taxus baccata 3.5 2.0 7.5
10 Taxus baccata 2.9 2.7 3.2
84 changes: 84 additions & 0 deletions solutions/extracting-vectors-from-data-frames-R.txt
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