On 2/19/2008 9:24 AM, Hans Ekbrand wrote:
> Hi list
>
> I have a data frame I would like to loop over. To begin with I would
> like crosstabulations using the first variabel in the data frame,
> which is called "meriter".
>
>> table(meriter[[1]], meriter[[3]])
>
> ja nej
> Annan 0 2 1
> Avdelningen för teknik- och vetenskapsstudier 0 5 1
> CEFOS 0 6 3
> Förvaltningshögskolan 0 13 6
> Institutionen för globala studier 0 20 12
> Institutionen för journalistik och masskommunikation 0 5 17
> Institutionen för socialt arbete 1 19 35
> Psykologiska institutionen 0 24 21
> Sociologiska institutionen 0 16 12
> Statsvetenskapliga institutionen 0 19 12
>>
>
> I tried the following small code snippet which I copied from the
> "Introduction to R":
>
>> for (i in 2:length(meriter)) { table(meriter[[1]], meriter[[i]]) }
Where did you find that? I don't see anything like it. (If there is
something like that, it should be fixed.)
If you are referring to this snippet:
>for (i in 1:length(yc)){
plot(xc [[i ]],yc [[i ]]);
abline(lsfit(xc [[i ]],yc [[i ]]))
}
then it has the important difference that plot() and abline() both have
side effects (they do plotting), whereas table() doesn't.
Duncan Murdoch
>
> And there is no output at all, just a new prompt.
>
> I added a print statement just to check the loop construct, and it
> seems to work.
>
>> for (i in 2:length(meriter)) { print(i); table(meriter[[1]], meriter[[i]]) }
> [1] 2
> [1] 3
> [1] 4
>
> But I get no tables :-(
>
> What do I do wrong?
>
>
>
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>
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