This method is defined principally so that you can use a CrunchDataset as
a data argument to other R functions (such as stats::lm()) without
needing to download the whole dataset. You can, however, choose to download
a true data.frame.
# S3 method for CrunchDataset
as.data.frame(
x,
row.names = NULL,
optional = FALSE,
force = FALSE,
categorical.mode = "factor",
row.order = NULL,
include.hidden = TRUE,
...
)# S3 method for CrunchDataFrame
as.data.frame(
x,
row.names = NULL,
optional = FALSE,
include.hidden = attr(x, "include.hidden"),
...
)
When called on a CrunchDataset, the method returns an object of
class CrunchDataFrame unless force = TRUE, in which case the return is a
data.frame. For CrunchDataFrame, the method returns a data.frame.
a CrunchDataset or CrunchDataFrame
part of as.data.frame signature. Ignored.
part of as.data.frame signature. Ignored.
logical: actually coerce the dataset to data.frame, or
leave the columns as unevaluated promises. Default is FALSE.
what mode should categoricals be pulled as? One of factor, numeric, id (default: factor)
vector of indices. Which, and their order, of the rows of
the dataset should be presented as (default: NULL). If NULL, then the
Crunch Dataset order will be used.
logical: should hidden variables be included? (default: TRUE)
additional arguments passed to as.data.frame (default method).
By default, the as.data.frame method for CrunchDataset does not return a
data.frame but instead CrunchDataFrame, which behaves like a
data.frame without bringing the whole dataset into memory.
When you access the variables of a CrunchDataFrame,
you get an R vector, rather than a CrunchVariable. This allows modeling functions
that require select columns of a dataset to retrieve only those variables from
the remote server, rather than pulling the entire dataset into local
memory.
If you call as.data.frame() on a CrunchDataset with force = TRUE, you
will instead get a true data.frame. You can also get this data.frame by
calling as.data.frame on a CrunchDataFrame (effectively calling
as.data.frame on the dataset twice)
When a data.frame is returned, the function coerces Crunch Variable
values into their R equivalents using the following rules:
Numeric variables become numeric vectors
Text variables become character vectors
Datetime variables become either Date or POSIXt vectors
Categorical variables become either factors with
levels matching the Crunch Variable's categories (the default), or, if
categorical.mode is specified as "id" or "numeric", a numeric vector of
category ids or numeric values, respectively
Array variables (Categorical Array, Multiple Response) are decomposed into
their constituent categorical subvariables. An array with three subvariables,
for example, will result in three columns in the data.frame.
Column names in the data.frame are the variable/subvariable aliases.