Generic method for converting objects to Crunch representations
R objects are converted to Crunch objects using the following rules:
toVariable(x, ...) ## S4 method for signature 'CrunchVarOrExpr' toVariable(x, ...) ## S4 method for signature 'character' toVariable(x, ...) ## S4 method for signature 'numeric' toVariable(x, ...) ## S4 method for signature 'factor' toVariable(x, ...) ## S4 method for signature 'Date' toVariable(x, ...) ## S4 method for signature 'POSIXt' toVariable(x, ...) ## S4 method for signature 'AsIs' toVariable(x, ...) ## S4 method for signature 'VariableDefinition' toVariable(x, ...) ## S4 method for signature 'logical' toVariable(x, ...) ## S4 method for signature 'labelled' toVariable(x, ...) ## S4 method for signature 'haven_labelled' toVariable(x, ...) ## S4 method for signature 'labelled_spss' toVariable(x, ...) ## S4 method for signature 'haven_labelled_spss' toVariable(x, ...)
x |
An R vector you want to turn into a Crunch variable |
... |
Additional metadata fields for the variable, such as "name" and "description". See the API documentation for a complete list of valid attributes. |
Character vectors are converted into Crunch text variables
Numeric vectors are converted into Crunch numeric variables
Factors are converted to categorical variables
Date and POSIXt vectors are converted into Crunch datetime variables
Logical vectors are converted to Crunch categorical variables
VariableDefinition()s are not converted, but the function can still
append additional metadata
If you have other object types you wish to convert to Crunch variables,
you can declare methods for toVariable.
A VariableDefinition object. To add this to a dataset, either
assign it into the dataset (like ds$newvar <- toVariable(...)) or call
addVariables(). If you're adding a column of data to a dataset, it must be
as long as the number of rows in the dataset, or it may be a single value to
be recycled for all rows.
var1 <- rnorm(10) toVariable(var1) toVariable(var1, name = "Random", description = "Generated in R") ## Not run: ds$random <- toVariable(var1, name = "Random") # Or, this way: ds <- addVariables(ds, toVariable(var1, name = "Random")) ## End(Not run)
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