#' Rename columns
#'
#' \code{rename_columns} renames columns of a matrix or data frame
#'
#' @param DF original data frame
#' @param newname new names for columns
#' @export
rename_columns = function( DF, origname=colnames(DF), newname ){
DF_new = DF
for(i in 1:length(origname)){
Match = match( origname[i], colnames(DF_new) )
if(length(Match)==1) colnames(DF_new)[Match] = newname[i]
}
return(DF_new)
}
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