Internal helper functions

Calculate file hash for integrity checking

A utility function that creates a new variable by joining the values of a given list of variables.

Usage

calculate_file_hash(file_path)

concat(x, formula)

Arguments

file_path

Path to the file

x

a data frame where variables are taken from.

formula

a response-less formula (~ followed by a +-separated list of variables)

Value

MD5 hash of the file

A new variable by concatenating values of variables given by formula.

Examples

du4tnr:::concat(data.frame(A=c('a', 'b', 'a', 'b'), B=c('x', 'y', 'y', 'x')), ~A+B)
#> [1] "a-x" "b-y" "a-y" "b-x"