R: Pretty axis breaks inclusive of extreme values

extended_range_breaks_ {ggthemes} | R Documentation

## Pretty axis breaks inclusive of extreme values

### Description

This function returns pretty axis breaks that always include the extreme values of the data. This works by calling the extended Wilkinson algorithm (Talbot et. al, 2010), constrained to solutions interior to the data range. Then, the minimum and maximum labels are moved to the minimum and maximum of the data range.

### Usage

    extended_range_breaks_(dmin, dmax, n = 5, Q = c(1, 5, 2, 2.5, 4, 3),
      w = c(0.25, 0.2, 0.5, 0.05))

    extended_range_breaks(n = 5, ...)

### Arguments

`dmin` | minimum of the data range
`dmax` | maximum of the data range
`n` | desired number of breaks
`Q` | set of nice numbers
`w` | weights applied to the four optimization components (simplicity, coverage, density, and legibility)
`...` | other arguments passed to `extended_range_breaks_`

### Details

`extended_range_breaks` implements the algorithm and returns the break values. `scales_extended_range_breaks` uses the conventions of the scales package, and returns a function.

### Value

For `extended_range_breaks`, the vector of axis label locations. For `scales_extended_range_breaks`, a function which takes a single argument, a vector of data, and returns the vector of axis label locations.

A function which returns breaks given a vector.

### Author(s)

Justin Talbot jtalbot@stanford.edu, Jeffrey B. Arnold, Baptiste Auguie

### References

Talbot, J., Lin, S., Hanrahan, P. (2010) An Extension of Wilkinson's Algorithm for Positioning Tick Labels on Axes, InfoVis 2010.

[Package ggthemes version 3.4.2 Index]