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Let'say we have a dataframe mydata with column v1. If mydata$v1 is passed to a function, is there way, then, to extract the name of the dataframe? What I now do is passing the name of the dataframe to the funcion, so passing two parameters. Maybe with mydata$v1 it is not possible, but with mydata['v1'] or mydata[,'v1'] it is? Thanks Frans ------------------- Frans Marcelissen