R: Position scales for units data

scale_unit {ggforce} | R Documentation

## Position scales for units data

### Description

These are the default scales for the units class. These will usually be added automatically. To override manually, use `scale_*_unit`.

### Usage

    scale_x_unit(name = waiver(), breaks = waiver(), unit = NULL,
      minor_breaks = waiver(), labels = waiver(), limits = NULL,
      expand = waiver(), oob = censor, na.value = NA_real_,
      trans = "identity", position = "bottom", sec.axis = waiver())

    scale_y_unit(name = waiver(), breaks = waiver(), unit = NULL,
      minor_breaks = waiver(), labels = waiver(), limits = NULL,
      expand = waiver(), oob = censor, na.value = NA_real_,
      trans = "identity", position = "left", sec.axis = waiver())

### Arguments

`name` | The name of the scale. Used as axis or legend title. If `NULL`, the default, the name of the scale is taken from the first mapping used for that aesthetic.
`breaks` | One of: `NULL` for no breaks `waiver()` for the default breaks computed by the transformation object A numeric vector of positions A function that takes the limits as input and returns breaks as output
`unit` | A unit specification to use for the axis. If given, the values will be converted to this unit before plotting. An error will be thrown if the specified unit is incompatible with the unit of the data.
`minor_breaks` | One of: `NULL` for no minor breaks `waiver()` for the default breaks (one minor break between each major break) A numeric vector of positions A function that given the limits returns a vector of minor breaks.
`labels` | One of: `NULL` for no labels `waiver()` for the default labels computed by the transformation object A character vector giving labels (must be same length as `breaks`) A function that takes the breaks as input and returns labels as output
`limits` | A numeric vector of length two providing limits of the scale. Use `NA` to refer to the existing minimum or maximum.
`expand` | A numeric vector of length two giving multiplicative and additive expansion constants. These constants ensure that the data is placed some distance away from the axes. The defaults are `c(0.05, 0)` for continuous variables, and `c(0, 0.6)` for discrete variables.
`oob` | Function that handles limits outside of the scale limits (out of bounds). The default replaces out of bounds values with NA.
`na.value` | Missing values will be replaced with this value.
`trans` | Either the name of a transformation object, or the object itself. Built-in transformations include "asn", "atanh", "boxcox", "exp", "identity", "log", "log10", "log1p", "log2", "logit", "probability", "probit", "reciprocal", "reverse" and "sqrt". A transformation object bundles together a transform, it's inverse, and methods for generating breaks and labels. Transformation objects are defined in the scales package, and are called `name_trans`, e.g. `boxcox_trans`. You can create your own transformation with `trans_new`.
`position` | The position of the axis. "left" or "right" for vertical scales, "top" or "bottom" for horizontal scales
`sec.axis` | specifify a secondary axis

### Examples

    library(units)
    gallon <- make_unit('gallon')
    mtcars$consumption <- mtcars$mpg * with(ud_units, mi/gallon)
    mtcars$power <- mtcars$hp * with(ud_units, hp)

    # Use units encoded into the data
    ggplot(mtcars) +
        geom_point(aes(power, consumption))

    # Convert units on the fly during plotting
    ggplot(mtcars) +
        geom_point(aes(power, consumption)) +
        scale_x_unit(unit = 'W') +
        scale_y_unit(unit = 'km/l')

    # Resolve units when transforming data
    ggplot(mtcars) +
        geom_point(aes(power, 1/consumption))

[Package ggforce version 0.1.2 Index]