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omit empty cells in crosstab?

sjaffe 
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

Thread (8 messages)

sjaffe omit empty cells in crosstab? Apr 24 Hadley Wickham omit empty cells in crosstab? Apr 24 Dieter Menne omit empty cells in crosstab? Apr 24 Peter Dalgaard omit empty cells in crosstab? Apr 24 sjaffe omit empty cells in crosstab? Apr 24 Phil Spector omit empty cells in crosstab? Apr 24 Hadley Wickham omit empty cells in crosstab? Apr 24 Bernardo Rangel Tura omit empty cells in crosstab? Apr 26