r - How to display only corresponding computed result and not all results for each row when using [tapply] -


i'm having issues on displaying results. stored 3 vectors dataframe , perform computation , store new vector before combining new vector dataframe.

h=c(155,150,165,190,177) w=c(85,90,72,99,55) g=c("f","f","m","f","m") df=data.frame(h,w,g) row.names(df)=c("alpha","bravo","charlie","foxtrot","echo") bmi=tapply(df$w,df$h,function(calc){(df$w/(df$h)^2)*10000}) cbind(df,bmi)

and printed result 

        h  w g                                              bmi alpha   155 85 f 35.37981, 40.00000, 26.44628, 27.42382, 17.55562 bravo   150 90 f 35.37981, 40.00000, 26.44628, 27.42382, 17.55562 charlie 165 72 m 35.37981, 40.00000, 26.44628, 27.42382, 17.55562 foxtrot 190 99 f 35.37981, 40.00000, 26.44628, 27.42382, 17.55562 echo    177 55 m 35.37981, 40.00000, 26.44628, 27.42382, 17.55562

however, want display 

         h  w g  bmi alpha   155 85 f 35.37981  bravo   150 90 f 40.00000 charlie 165 72 m 26.44628 foxtrot 190 99 f 27.42382 echo    177 55 m 17.55562


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