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Dec 7th, 2016
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  1. Para borrar de un data frame columnas que tengan solo ceros
  2.  
  3. ```{r}
  4. df<- data.frame()
  5. df<-df[,colSums(df != 0) != 0]
  6.  
  7. ## Para borrar as columnas que sean NA de un data frame df
  8. df<-df[!is.na(df$var2),]
  9. ```
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