Dear R helpers,
 
I have two queries.
 
(1) If the dataset contains some variables having all the entries = 0 and while analysing I want to delete those pericular columns, how do acheive this. i.e.
 
dataset1
 
sr_no    var1      var2       var3        var4        var5
1           5           0          3              1           0
2           3           0          2              9           0
3           4           0          4              7           0 
4          11          0          1              6           0
 
In the above dataset, var2 and var3 are all 0's so I don't want to select these columns. It is not that always these two variables will be zeros, so in general how the dataset can be filtered in order to have only non-zero columns.
 
(2)  Suppose I have variable no of datasets 'say n = 10'. I wish to write a loop assigning each of these datasets to diffrent csv files e.g.
 
for (i in 1:10)
 {
write.csv(data.frame(dataset[,,i]), 'data_set[i].csv', row.names = FALSE)
 }

The result of this command is generation of a csv file 'data_set[i].csv' containing the last dataset (owing to the wrong command written by me).
 
What I need is creation of say data_set[1].csv, data_set[2].csv,  .........data_set[10].csv i.e. 10 different csv files containing 10 different datasets.
Thanking you in advance

Anna
 


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