removeVariables: Remove columns from a cohort object
In CALIBERdatamanage: Data Management Tools for CALIBER Datasets

Description Usage Arguments Value Author(s) See Also Examples

Deletes one or more columns and also deletes their description. If the cohort object is a data.table, it is updated by reference, if a flat file data frame the modified object is returned.

1 2	removeVariables(x, colnames) removeColumns(x, colnames)

`x`	a `cohort` object
`colnames`	a character vector of the column names to delete

Returns the modified ffdf or data.table, invisibly.

Anoop Shah

cohort, subset.cohort, modifyDescription

COHORT <- cohort(data.table(anonpatid = 1:3,
    indexdate = as.IDate(c("2012-1-3", "2012-1-2", "2010-1-9")),
    sex = c("M", "F", "M")))
removeColumns(COHORT, c('indexdate', 'sex'))
print(COHORT)