two more links to ?measure (#6508)

Author: tdhock

man/melt.data.table.Rd

@@ -31,7 +31,7 @@ non-measure columns will be assigned to it. If integer, must be positive; see De
   }
 
     For convenience/clarity in the case of multiple \code{melt}ed columns, resulting column names can be supplied as names to the elements \code{measure.vars} (in the \code{list} and \code{patterns} usages). See also \code{Examples}. }
-\item{variable.name}{name (default \code{'variable'}) of output column containing information about which input column(s) were melted. If \code{measure.vars} is an integer/character vector, then each entry of this column contains the name of a melted column from \code{data}. If \code{measure.vars} is a list of integer/character vectors, then each entry of this column contains an integer indicating an index/position in each of those vectors. If \code{measure.vars} has attribute \code{variable_table} then it must be a data table with nrow = length of \code{measure.vars} vector(s), each row describing the corresponding measured variables(s), (typically created via \code{measure}) and its columns will be output instead of the \code{variable.name} column.}
+\item{variable.name}{name (default \code{'variable'}) of output column containing information about which input column(s) were melted. If \code{measure.vars} is an integer/character vector, then each entry of this column contains the name of a melted column from \code{data}. If \code{measure.vars} is a list of integer/character vectors, then each entry of this column contains an integer indicating an index/position in each of those vectors. If \code{measure.vars} has attribute \code{variable_table} then it must be a data table with nrow = length of \code{measure.vars} vector(s), each row describing the corresponding measured variables(s), (typically created via \code{\link{measure}}) and its columns will be output instead of the \code{variable.name} column.}
 \item{value.name}{name for the molten data values column(s). The default name is \code{'value'}. Multiple names can be provided here for the case when \code{measure.vars} is a \code{list}, though note well that the names provided in \code{measure.vars} take precedence. }
 \item{na.rm}{If \code{TRUE}, \code{NA} values will be removed from the molten
 data.}
@@ -66,8 +66,8 @@ into multiple columns in a single function call efficiently.
 If a vector in the list contains missing values, or is shorter than the
 max length of the list elements, then the output will include runs of
 missing values at the specified position, or at the end.
-The function
-\code{\link{patterns}} can be used to provide regular expression patterns. When
+The functions
+\code{\link{patterns}} and \code{\link{measure}} can be used to provide regular expression patterns. When
 used along with \code{melt}, if \code{cols} argument is not provided, the
 patterns will be matched against \code{names(data)}, for convenience.