compute<- {Dasst}

Compute within columns from an object of class Dasst.

Description

compute<- computes an expression using the columns of the object of class Dasst.

Arguments

x

An object of class Dasst.

cocol

A character string. The name of the new column field.

value

A character string. An expression to compute within column fields.

Details

This method computes an expression taking the values recorded on each column field used in the expression belonging to the object of class Dasst. The result is stored as a new column table.

So far, the new column will not be saved if the write method is invoked.

Value

The actual object of class Dasst.

Examples

data(plantGrowth)
compute(plantGrowth, "date_YEAR_DOY") <-
 "as.Date(paste(YEAR, DOY, sep=\"\"), format=\"%Y%j\")"