ggthemes (version 2.1.0)

extended_range_breaks: 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 alogorithm (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))
scales_extended_range_breaks(expand = c(0, 0), ...)

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)

expand

see scale_x_continuous.

...

other arguments passed to extended_range_breaks

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.

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.

References

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

See Also

scale_y_tufte, scale_x_tufte