jDayCol: jDayCol

In lwTools/agriTrf: Agricultural Transformation Package: data management, depiction and modelling

Description

jDayCol takes as input a date.frame object or a data.frame object name (dfData), a column name (dfColName), and the date format (dateFormat) of the column dfColName and inserts a new column in the data.frame object containing the day of the year corresponding to the entries in the column dfColName. The location of the new column is dictated by endRep.

Usage

jDayCol(dfData, dfColName, dateFormat, endRep = "end")

Arguments

dfData	a data.frame object or a character string indicating the name of the data.frame object.
dfColName	a string of class character indicating the name of the column to be handled. The entries in this column must be dates in the date format given by the parameter dateFormat
dateFormat	a character string indicating the date format of the column dfColName
endRep	a character string (default: "end") indicating whether to append the new columns at the end (endRep=="end") or replace the original columns with the respective new columns (endRep=="rep") or insert the new columns right after the respective columns (endRep=="after") in the data.frame object dfData.

Value

jDayCol updates the data.frame object dfData by adding a new column containing the day of the year corresponding to the entries in column dfColName of the original data.frame object. The entries in the new column are integers in the range [1,366]

Examples

jDayCol("employees","start_date","%Y-%m-%d")
jDayCol(students,"date_of_birth","%d.%m.%Y",F)

lwTools/agriTrf documentation built on March 26, 2020, 12:09 a.m.