joyn (version 0.2.4)

check_xy: Check tables X and Y

Description

This function performs checks inspired on merge.data.table: it detects errors

• if x and/or y have no columns

• if x and/or y contain duplicate column names

Usage

check_xy(x, y)

Value

invisible TRUE

Arguments

x

data frame: referred to as left in R terminology, or master in Stata terminology.

y

data frame: referred to as right in R terminology, or using in Stata terminology.

Examples

if (FALSE) {
# Check passing with no errors
library(data.table)
x1 = data.table(id = c(1L, 1L, 2L, 3L, NA_integer_),
                t  = c(1L, 2L, 1L, 2L, NA_integer_),
                x  = 11:15)
y1 = data.table(id = c(1,2, 4),
                y  = c(11L, 15L, 16))
joyn:::check_xy(x = x1, y=y1)
}