[R] newbie: table,mean for all variables

[C. Schulz]

Hello,
(1)
what is the way to use 
table for the hole dataSet ?

I would get a cross-table with x1 and other variables in the dataSet which have got 100 columns :

 table(x1,data[variable2 until variable 100])/length([variable2 until variable 100])*100     

like this but it's wrong ?
 table(x1,data[,2:100])/length(data[,2:100])*100     

if i type: table(data[,1:10])   
to get the frequency distribution of the first 10 variables ,
i get not the wished tables ?

(2) 
is it possible to set factors for
all variables in a dataSet in one step 
i.e. levels are all similar(?=NA,0,20,40,60,80,100)?

Additional how can i get all mean's in one step,too ?
I know that i cannot use the mean-function, because
i have NA's and factor variables.
So have got anybody a good tip i.e.
is it possible to get only the mean from the "summary" procedure ?


thanks for advance,
regards, Christian Schulz



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