add_diff_value: Add a new column as a differenced value of existing column
In vh-d/RETL: Various tools for ETL

Add a new column as a differenced value of existing column

1	add_diff_value(.data, value_var = NULL, by_vars = NULL, postfix = "_diff")

`.data`	input data.table
`value_var`	character; name of the original column
`by_vars`	character; vector of dimensions for 'group by'
`postfix`	character; posfix is added at the end of the name of the new column

vh-d/RETL documentation built on June 28, 2020, 10:33 a.m.

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