[R] Count all dataset

[Liaw, Andy]

Here are two (pretty much the same) ways:

> d
  x1 x2   x3
1  D  D    A
2  B  D    A
3  C  A <NA>
4  D  D    A
5  A  D    C
> table(sapply(d, as.character))

A B C D 
5 1 2 6 
> table(as.matrix(d))

A B C D 
5 1 2 6 
> sum(is.na(d))
[1] 1

HTH,
Andy


> From: Jan Sabee
> 
> Dear all R member,
> 
> I have a dataset which looks like:
> 
>  x1     x2 . . . x250
>   A     A           C
>   A     C           C
>   A     A           A
>   A     A        <NA>
>   B     B           B
> <NA> C           B
> ...
> more 2000 rows.
> 
> I need count all dataset at the following:
> 
> A       = sum of A
> B       = sum of B
> C       = sum of C
> <NA> = sum of <NA>
> 
> What function can I use?
> I'm just a beginner in R programming.
> 
> Best regards,
> Jan Sabee
> 
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