Version 0.2.0 of

`fpCompare`

has been released on CRAN

Comparisons of floating point numbers are problematic due to errors associated with the binary representation of decimal numbers. Computer scientists and programmers are aware of these problems and yet people still use numerical methods which fail to account for floating point errors (this pitfall is the first to be highlighted in Circle 1 of Burns (2012) The R Inferno).

Inspired by R FAQ 7.31 and this Stack Overflow answer, the `fpCompare`

package provides new relational operators useful for performing floating point number comparisons with a set tolerance:

```
set.seed(123)
<- 1:6
a <- jitter(1:6, 1e-7)
b print(rbind(a,b), digits=16)
%<=% a # b <= a
b %<<% a # b < a
b %>=% a # b >= a
b %>>% a # b > a
b %==% a # b == a
b %!=% a # b != a b
```

These functions use the `base`

relational operators to make comparisons, but incorporate a tolerance value (`fpCompare.tolerance`

), set via `options`

. It uses the same default tolerance value used in `all.equal`

for numeric comparisons.

```
# set telorance value
= .Machine$double.eps^0.5 # default value
tol options(fpCompare.tolerance = tol)
# perform comparisons
<- 0.5 - 0.3
x1 <- 0.3 - 0.1
x2 == x2 # FALSE on most machines
x1 %==% x2 # TRUE everywhere x1
```

## Installation

### From CRAN

`install.packages("fpCompare")`

### From GitHub

```
library(devtools)
install_github("PredictiveEcology/fpCompare")
```