[R] ftables package, zero rows

[Marc Flockerzi]

thanks, but not quite what i wanted.
to be more precise: i want the whole zero-lines to be deleted, including the attribute. in my final table only rows with non-zero rows should remain.
regarding my small toy example:
this is what i have:
>test

>  c a b c d
>  a b
>  1 4 2 0 0 0
>  5 0 1 0 1
>  6 0 0 1 0
>  7 0 0 0 0
>  8 0 0 0 0
>  9 0 0 0 0
>  2 4 0 0 0 0
>  5 0 0 0 0
>  6 0 0 0 0
>  7 0 1 0 1
>  8 0 1 0 1
>  9 1 0 0 0


this is what i want:

>  c    a b c d
>  ab
>  1  4 2 0 0 0
>      5 0 1 0 1
>      6 0 0 1 0
> 2   7 0 1 0 1
>      8 0 1 0 1
>     9 1 0 0 0

best regards
marc


> -----Ursprüngliche Nachricht-----
> Von: "Henrique Dallazuanna" <wwwhsd at gmail.com>
> Gesendet: 02.09.08 18:33:53
> An: "Marc Flockerzi" <marc.flockerzi at web.de>
> CC: r-help at r-project.org
> Betreff: Re: [R] ftables package, zero rows


> 
> Try this:
> 
> test[test == 0] <- ''
> test
> 
> 
> On Tue, Sep 2, 2008 at 1:03 PM, Marc Flockerzi <marc.flockerzi at web.de>
> wrote:
> dear all,
> 
>  i'm just about to do some straightforward contingency tables using 
> ftables (and ctab() for percents).
> 
>  the problem:
>  factor "a" are regions, factor "b" are subregions.
>  every region "a" consists of some subregions "b", but obviously not 
> every subregion "b" is part of every region "a".
>  if i use the ftable() function, the table contains a lot of zero 
> rows which i don't want in my output.
> 
>  minimal example:
> 
>  a <- c(1,1,1,1,1,2,2,2,2,2)
>  > b <- c(4,5,6,5,4,7,8,9,8,7)
>  > c <- c("a","b","c","d","a","b","b","a","d","d")
>  > A <- cbind(a,b,c)
>  > A
>  a b c
>  [1,] "1" "4" "a"
>  [2,] "1" "5" "b"
>  [3,] "1" "6" "c"
>  [4,] "1" "5" "d"
>  [5,] "1" "4" "a"
>  [6,] "2" "7" "b"
>  [7,] "2" "8" "b"
>  [8,] "2" "9" "a"
>  [9,] "2" "8" "d"
>  [10,] "2" "7" "d"
>  > test <- ftable(a,b,c)
>  > test
>  c a b c d
>  a b
>  1 4 2 0 0 0
>  5 0 1 0 1
>  6 0 0 1 0
>  7 0 0 0 0
>  8 0 0 0 0
>  9 0 0 0 0
>  2 4 0 0 0 0
>  5 0 0 0 0
>  6 0 0 0 0
>  7 0 1 0 1
>  8 0 1 0 1
>  9 1 0 0 0
> 
>  my question: how can i "delete" the zero rows and preserve the 
> structure and attributes of the original table?
>  simply doing something like:
>  test2 <- test[test>0]
>  obviously only returns the non-zero values, but not the nice 
> structure and attributes of the original table.
> 
>  to do it by hand is not an option as the original table has like 
> 2000 rows, 1500 of which are zero...
> 
>  thanks in advance
>  marc
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> 
> 
> 
> -- 
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
> 
> 


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