within_bounds {assertr} | R Documentation |

## Creates bounds checking predicate

### Description

This function returns a predicate function that will take a numeric value
or vector and return TRUE if the value(s) is/are within the bounds set.
This does not actually check the bounds of anything–it only returns
a function that actually does the checking when called with a number.
This is a convenience function meant to return a predicate function to
be used in an `assertr`

assertion.

### Usage

```
within_bounds(
lower.bound,
upper.bound,
include.lower = TRUE,
include.upper = TRUE,
allow.na = TRUE,
check.class = TRUE
)
```

### Arguments

`lower.bound` |
The lowest permitted value |

`upper.bound` |
The upper permitted value |

`include.lower` |
A logical indicating whether lower bound should be inclusive (default TRUE) |

`include.upper` |
A logical indicating whether upprt bound should be inclusive (default TRUE) |

`allow.na` |
A logical indicating whether NAs (including NaNs) should be permitted (default TRUE) |

`check.class` |
Should the class of the |

### Value

A function that takes numeric value or numeric vactor and returns
TRUE if the value(s) is/are within the bounds defined by the
arguments supplied by `within_bounds`

and FALSE
otherwise

### Examples

```
predicate <- within_bounds(3,4)
predicate(pi)
## is equivalent to
within_bounds(3,4)(pi)
# a correlation coefficient must always be between 0 and 1
coeff <- cor.test(c(1,2,3), c(.5, 2.4, 4))[["estimate"]]
within_bounds(0,1)(coeff)
## check for positive number
positivep <- within_bounds(0, Inf, include.lower=FALSE)
## this is meant to be used as a predicate in an assert statement
assert(mtcars, within_bounds(4,8), cyl)
## or in a pipeline
library(magrittr)
mtcars %>%
assert(within_bounds(4,8), cyl)
```

*assertr*version 3.0.1 Index]