scale_numeric: Add a numeric scale to a ggvis object.

Description

A numeric (quantitative) scale controls the mapping of continuous variables to visual properties.

Usage

scale_numeric(vis, property, domain = NULL, range = NULL, reverse = NULL,
  round = NULL, trans = NULL, clamp = NULL, exponent = NULL,
  nice = NULL, zero = NULL, expand = NULL, name = property,
  label = NULL, override = NULL)

Arguments

vis

A ggvis object.

property

The name of a visual property, such as "x", "y", "fill", "stroke". Note both x and x2 use the "x" scale (similarly for y and y2). fillOpacity, opacity and strokeOpacity use the "opacity" scale.

domain

The domain of the scale, representing the set of data values. For ordinal scales, a character vector; for quantitative scales, a numeric vector of length two. Either value (but not both) may be NA, in which case domainMin or domainMax

range

The range of the scale, representing the set of visual values.
For numeric values, the range can take the form of a two-element array with
minimum and maximum values. For ordinal data, the range may by an array of
desired output values, which are mapped t

reverse

If true, flips the scale range.

round

If true, rounds numeric output values to integers. This can be
helpful for snapping to the pixel grid.

trans

A scale transformation: one of "linear", "log", "pow", "sqrt",
"quantile", "quantize", "threshold". Default is "linear".

clamp

If TRUE, values that exceed the data domain are clamped
to either the minimum or maximum range value. Default is FALSE.

exponent

Sets the exponent of the scale transformation. For pow
transform only.

nice

If TRUE, modifies the scale domain to use a more
human-friendly number range (e.g., 7 instead of 6.96). Default is
FALSE.

zero

If TRUE, ensures that a zero baseline value is included
in the scale domain. This option is ignored for non-quantitative scales.
Default is FALSE.

expand

A multiplier for how much the scale should be expanded beyond
the domain of the data. For example, if the data goes from 10 to 110, and
expand is 0.05, then the resulting domain of the scale is 5 to 115.
Set to 0 and use nice=FALSE

name

Name of the scale, such as "x", "y", "fill", etc. Can also be an
arbitrary name like "foo".

label

Label for the scale. Used for axis or legend titles.

override

Should the domain specified by this ggvis_scale object
override other ggvis_scale objects for the same scale? Useful when domain is
manually specified. For example, by default, the domain of the scale
will contain the range of the data, but when this is T

`Details`

The default values for most of the arguments is NULL. When the plot is
created, these NULL values will be replaced with default values, as indicated
below.

`See Also`

scales, scale_ordinal,
  https://github.com/trifacta/vega/wiki/Scales#quantitative-scale-properties
Other scales: scale_datetime;
  scale_logical, scale_nominal,
  scale_ordinal

`Examples`

Run this codep <- mtcars %>% ggvis(~wt, ~mpg, fill = ~hp) %>% layer_points()

p %>% scale_numeric("y")

p %>% scale_numeric("y", trans = "pow", exponent = 0.5)

p %>% scale_numeric("y", trans = "log")

# Can control other properties other than x and y
p %>% scale_numeric("fill", domain = c(0, 120), clamp = TRUE)

# Set range of data from 0 to 3
p %>% scale_numeric("x", domain = c(0, 3), clamp = TRUE, expand = 0,
                     nice = FALSE)

# Lower bound is set to lower limit of data, upper bound set to 3.
p %>% scale_numeric("x", domain = c(NA, 3), clamp = TRUE, nice = FALSE)
Run the code above in your browser using DataLab