Stops if data frame frm does not contain all columns of which the names are given in reqCols.
checkForMissingColumns(frm, reqCols, do.stop = TRUE, dataFrameName = deparse(substitute(frm)))
frm | data frame |
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reqCols | vector of names of which existence in frm shall be checked |
do.stop | if TRUE, stop() is called else warning() if a column is missing |
dataFrameName | the name of the data frame to be shown in the error message if a column was missing |
TRUE if all required columns are available, else FALSE