The functions in ggformula provide a formula interface to ggplot2 layer
functions and a system for working with pipes to create multi-layer
plots and to refine plots.
For plots with just one layer, the formula interface
is more compact than native ggplot2 code and is consistent with modeling
functions like lm() that use a formula interface and with the
numerical summary functions in the mosaic package.
Positional aesthetics are typically specified using a formula (see the gformula argument).
Setting and mapping of additional attributes can be done through the use of additional arguments.
Attributes can be set can be set using arguments of the form attribute = value or
mapped using arguments of the form attribute = ~ expression.
In formulas of the form A | B, B will be used to form facets using
facet_wrap() or facet_grid().
This provides an alternative to gf_facet_wrap() and
gf_facet_grid() that is terser and may feel more familiar to users
of lattice.
Evaluation of the ggplot2 code occurs in the environment of gformula.
This will typically do the right thing when formulas are created on the fly, but might not
be the right thing if formulas created in one environment are used to create plots
in another.
# NOT RUN {
apropos("gf_")
gf_point()
# }
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