The R Environment

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# Vector Data Containers

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# Caveats

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# The Recycling Rule

Operations on vectors that expect a particular length are handled (somewhat gracefully) using the

<div class="box-green">*Recycling Rule*: The shorter of the two vectors will be stretched by reusing values from the start to equal the length of the larger vector.</div>

```r
x <- c(10,20,30)
y <- c(1,2,3,4,5,6,7,8,9) 
x + y
```

```
## [1] 11 22 33 14 25 36 17 28 39
```

If the shorter vector length is not a clean multiple of the larger one, it will issue a warning to let you know in case these dangling parts could cause problems.

```r
y <- 1:10
x + y
```

```
## Warning in x + y: longer object length is not a multiple of shorter object
## length
```

```
##  [1] 11 22 33 14 25 36 17 28 39 20
```

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# Questions?

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]

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