[R] Help on Histogram ~ Barplot

[Shivi82]

HI Jim,

Thanks for the help however R throws an error when i create a var
tot_mon_wt- 
tot_mon_wt<-by(mwlc$MFST_WT,mwlc$Month,sum). It gives me an error = 
Error in Summary.factor(c(1L, 1L), na.rm = FALSE) : 
  ‘sum’ not meaningful for factors

Not sure what this error refers to. Thank you, Shivi



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