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...ave a simple data table, numeric and text columns, named dt. The table is imported through read.csv from a csv file. Row numbers are automatically assigned, header is set to TRUE. there are 599 rows and several columns. I am trying to plot using the stripchart command: one numeric variable (say dt$fnatg) vs a text column (say dt$pat). dt$pat contains one of 3 values: "pos", "neg", "" So I issue the following command: >stripchart (dt$fnatg~dt$pat) and works well. it works well also with several options and nuances: >stripchart (dt$fnatg ~ dt$pat, method =&quo...