Plot multiple box-plots (several numeric variables vs. one categorical variable) in R

Question

My question is exactly the same to this link Plot multiple box-plots using columns of dataframe in R

The only difference is that I have lots of NA among the numeric variables, I tried to run the suggested code by jbaums (you can see the suggested programming code in this link) but I got NULL as a results. Do you have any idea regarding fixing this issue. Thanks.

For example:

categ<-c(1,2,2,1,2,2,1,2,1,2)
var1 <- c(10:15,NA,NA,NA,34)
var2 <- c(100:115,NA,23,NA,34)
var3 <- c(20:25,NA,NA,NA,34)
var4 <- c(1000:1015,23,NA,NA,500)
var5 <- c(1:5,NA,NA,NA,NA,NA)
data.frame(categ,var1,var2,var3,var4,var5)

Answer 1

Can you post the exact code you're running and a sample of your data? Just a head(data) or even just str(data) should be enough.

Looking at the docs for boxplot ( ?boxplot in the R console) suggests that the default behaviour is to ignore NA values, but you can try to set na.action = NULL in your call to boxplot. If it's not working then the problem is in the rest of your code.