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- Syntax error.

- Changing a variable without realizing you did so.
- It did something else than I expected!

- The function or operation does not accept the input data type.
- The function or operation does not accept the input data type.

- It did something else than I expected!
- Changing a variable without realizing you did so.

Solutions:

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# W2: Working with data structures
# Working with data structures

## Vectors

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In the exercise this past week, you looked at a new operation to subset elements of a vector using brackets.

**Execution rule for vector brackets**:

*Evaluate the expression in the bracket first. The return value of the expression in the bracket, which must be a numeric or a numeric vector, dictates which elements of the vector to return.*

Inside the bracket is either a single numeric value or an a **numerical indexing vector** containing numerical values.
Inside the bracket is either a single numeric value or an a **numerical indexing vector** containing numerical values. They dictate which elements of the vector to return.


```r
Expand All @@ -105,7 +101,7 @@ small_staff = staff[c(1, 2)]

In the last line, we created a new vector `small_staff` that is a subset of the staff given the indexing vector `c(1, 2)`. We have three vectors referenced in one line of code. This is tricky and we need to always refer to our rules step-by-step: evaluate the expression right of the `=`, which contains a vector bracket. Follow the rule of the vector bracket. Then store the returning value to the variable left of `=`.

Alternatively, instead of using numerical indexing vectors, we can use a **logical indexing vector**. The logical indexing vector must be the *same length* as the vector to be subsetted, with TRUE indicating an element to keep, and FALSE indicating an element to drop. The following block of code gives the same value as before:
Alternatively, instead of using numerical indexing vectors, we can use a **logical indexing vector**. The logical indexing vector must be the *same length* as the vector to be subsetted, with `TRUE` indicating an element to keep, and `FALSE` indicating an element to drop. The following block of code gives the same value as before:


```r
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```r
metadata = read.csv("classroom_data/CCLE_metadata.csv")
load(url("https://github.com/fhdsl/S1_Intro_to_R/raw/main/classroom_data/CCLE.RData"))
```

### Using functions and operations on dataframes
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</ul></li>
<li class="chapter" data-level="2.11" data-path="intro-to-computing.html"><a href="intro-to-computing.html#tips-on-exercises-debugging"><i class="fa fa-check"></i><b>2.11</b> Tips on Exercises / Debugging</a></li>
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<li class="chapter" data-level="3.1" data-path="w2-working-with-data-structures.html"><a href="w2-working-with-data-structures.html#vectors"><i class="fa fa-check"></i><b>3.1</b> Vectors</a>
<li class="chapter" data-level="3.1" data-path="working-with-data-structures.html"><a href="working-with-data-structures.html#vectors"><i class="fa fa-check"></i><b>3.1</b> Vectors</a>
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<li class="chapter" data-level="3.1.1" data-path="w2-working-with-data-structures.html"><a href="w2-working-with-data-structures.html#using-operations-on-vectors"><i class="fa fa-check"></i><b>3.1.1</b> Using operations on vectors</a></li>
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<li class="chapter" data-level="3.1.3" data-path="working-with-data-structures.html"><a href="working-with-data-structures.html#subsetting-vectors-implicitly"><i class="fa fa-check"></i><b>3.1.3</b> Subsetting vectors implicitly</a></li>
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<li class="chapter" data-level="3.2" data-path="w2-working-with-data-structures.html"><a href="w2-working-with-data-structures.html#dataframes"><i class="fa fa-check"></i><b>3.2</b> Dataframes</a>
<li class="chapter" data-level="3.2" data-path="working-with-data-structures.html"><a href="working-with-data-structures.html#dataframes"><i class="fa fa-check"></i><b>3.2</b> Dataframes</a>
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<li class="chapter" data-level="3.1" data-path="w2-working-with-data-structures.html"><a href="w2-working-with-data-structures.html#vectors"><i class="fa fa-check"></i><b>3.1</b> Vectors</a>
<li class="chapter" data-level="3.1" data-path="working-with-data-structures.html"><a href="working-with-data-structures.html#vectors"><i class="fa fa-check"></i><b>3.1</b> Vectors</a>
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<li class="chapter" data-level="3.2" data-path="w2-working-with-data-structures.html"><a href="w2-working-with-data-structures.html#dataframes"><i class="fa fa-check"></i><b>3.2</b> Dataframes</a>
<li class="chapter" data-level="3.2" data-path="working-with-data-structures.html"><a href="working-with-data-structures.html#dataframes"><i class="fa fa-check"></i><b>3.2</b> Dataframes</a>
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<li class="chapter" data-level="2.11" data-path="intro-to-computing.html"><a href="intro-to-computing.html#tips-on-exercises-debugging"><i class="fa fa-check"></i><b>2.11</b> Tips on Exercises / Debugging</a></li>
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<li class="chapter" data-level="3.1" data-path="w2-working-with-data-structures.html"><a href="w2-working-with-data-structures.html#vectors"><i class="fa fa-check"></i><b>3.1</b> Vectors</a>
<li class="chapter" data-level="3.1" data-path="working-with-data-structures.html"><a href="working-with-data-structures.html#vectors"><i class="fa fa-check"></i><b>3.1</b> Vectors</a>
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