crunch (version 1.4.2)

expressions: Construct Crunch Expressions

Description

Crunch Expressions, i.e. CrunchExpr and CrunchLogicalExpr, encapuslate derivations of Crunch variables, which are only evaluated when passed to a function like as.vector. They allow you to compose functional expressions of variables and evaluate them against the server only when appropriate.

Usage

## S3 method for class 'CrunchExpr':
as.vector(x, mode = "any")
## S3 method for class 'CrunchExpr':
!(x)
## S3 method for class 'CategoricalVariable,character':
\%in\%(x, table)
## S3 method for class 'CategoricalVariable,factor':
\%in\%(x, table)
## S3 method for class 'TextVariable,character':
\%in\%(x, table)
## S3 method for class 'NumericVariable,numeric':
\%in\%(x, table)
## S3 method for class 'DatetimeVariable,Date':
\%in\%(x, table)
## S3 method for class 'DatetimeVariable,POSIXt':
\%in\%(x, table)
## S3 method for class 'CategoricalVariable,numeric':
\%in\%(x, table)
## S3 method for class 'CrunchVariable':
is.na(x)
bin(x)
rollup(x, resolution = rollupResolution(x))

Arguments

x

an input

mode

For as.vector. Ignored.

table

For %in%. See match

resolution

For rollup. Either NULL or a character in c("Y", "Q", "M", "W", "D", "h", "m", "s", "ms") indicating the unit of time at which a Datetime variable should be aggregated. If NULL, the server will determine an appropria

Value

• Most functions return a CrunchExpr or CrunchLogicalExpr. as.vector returns an R vector.