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- Author: Thomas Girke
- Last update: 18-Nov-2020
##' Modifies 'data' by adding new values supplied in newDataFileName | |
##' | |
##' newDataFileName is expected to have columns | |
##' c(lookupVariable,lookupValue,newVariable,newValue,source) | |
##' | |
##' Within the column 'newVariable', replace values that | |
##' match 'lookupValue' within column 'lookupVariable' with the value | |
##' newValue'. If 'lookupVariable' is NA, then replace *all* elements | |
##' of 'newVariable' with the value 'newValue'. | |
##' |
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