ggplot2 can not draw true 3d surfaces, but you can use
geom_tile to visualise 3d surfaces in 2d. To be a valid
surface, the data must contain only a single row for each unique combination
of the variables mapped to the
y aesthetics. Contouring
tends to work best when
y form a (roughly) evenly
spaced grid. If you data is not evenly spaced, you may want to interpolate
to a grid before visualising.
geom_contour(mapping = NULL, data = NULL, stat = "contour", position = "identity", ..., lineend = "butt", linejoin = "round", linemitre = 1, na.rm = FALSE, show.legend = NA, inherit.aes = TRUE) stat_contour(mapping = NULL, data = NULL, geom = "contour", position = "identity", ..., na.rm = FALSE, show.legend = NA, inherit.aes = TRUE)
Set of aesthetic mappings created by
aes_. If specified and
inherit.aes = TRUE (the
default), it is combined with the default mapping at the top level of the
plot. You must supply
mapping if there is no plot mapping.
The data to be displayed in this layer. There are three options:
NULL, the default, the data is inherited from the plot
data as specified in the call to
data.frame, or other object, will override the plot
data. All objects will be fortified to produce a data frame. See
fortify for which variables will be created.
function will be called with a single argument,
the plot data. The return value must be a
will be used as the layer data.
The statistical transformation to use on the data for this layer, as a string.
Position adjustment, either as a string, or the result of a call to a position adjustment function.
other arguments passed on to
layer. These are
often aesthetics, used to set an aesthetic to a fixed value, like
color = "red" or
size = 3. They may also be parameters
to the paired geom/stat.
Line end style (round, butt, square)
Line join style (round, mitre, bevel)
Line mitre limit (number greater than 1)
FALSE, the default, missing values are removed with
a warning. If
TRUE, missing values are silently removed.
logical. Should this layer be included in the legends?
NA, the default, includes if any aesthetics are mapped.
FALSE never includes, and
TRUE always includes.
FALSE, overrides the default aesthetics,
rather than combining with them. This is most useful for helper functions
that define both data and aesthetics and shouldn't inherit behaviour from
the default plot specification, e.g.
The geometric object to use display the data
geom_contour understands the following aesthetics (required aesthetics are in bold):
height of contour
geom_density_2d: 2d density contours
# Setting bins creates evenly spaced contours in the range of the data v + geom_contour(bins = 2)v + geom_contour(bins = 10)# Setting binwidth does the same thing, parameterised by the distance # between contours v + geom_contour(binwidth = 0.01)v + geom_contour(binwidth = 0.001)# Other parameters v + geom_contour(aes(colour = ..level..))v + geom_contour(colour = "red")