Column name assignment problem

Dear all,

I'm trying to assign a name to the fourth column whilst using 'assign', but keep encountering errors. What have I done wrong?!

assign(colnames(c(paste("arunoff_",table_year, sep="")[4]), "COUNT"))

Error in if (do.NULL) NULL else if (nc> 0) paste(prefix, seq_len(nc),  : 
  argument is not interpretable as logical


Hope someone is able to help.

Thanks for any pointers,

Steve


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