Reordering dcast data frame

Question

Is it possible to reorder the columns of data frame which is a result of dcast() call E.x.

Given the data:

> dput(copyOfRes)
structure(list(docNa         


        

Answer 1

You can use reorder here with rev

dcast(copyOfRes, docName ~ reorder(week_number,rev(week_number)), length)
Using week_number as value column: use value.var to override.
  docName 11 2
1    doc1 10 0
2    doc2  1 1

Answer 2

You can use factor() inside dcast() set appropriate order of levels.

 dcast(copyOfRes, 
   docName ~ factor(week_number,levels=unique(week_number)), length)
      docName 11 2
    1    doc1 10 0
    2    doc2  1 1