[R] omit empty cells in crosstab?

[hadley wickham]

Hi Steve,

The general answer is yes, but the specific will depend on your
problem.  Could you provide a small reproducible example to illustrate
your problem?

Hadley

On Fri, Apr 24, 2009 at 1:19 PM, sjaffe <sjaffe at riskspan.com> wrote:
>
> Perhaps this is a common question but I haven't been able to find the answer.
>
> I have data with many factors, each taking many values. However, only
> relatively few combinations appear in the data, ie have nonzero counts, in
> other words the resulting table is sparse. Say we have 10 factors each with
> 10 levels. The result of table() would exceed the memory space (on a 32bit
> machine). Is there any way to produce a table with empty cells omitted?
> (without first producing the whole table and then removing rows.)
>
> Thanks,
> Steve
>
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