2 answers: $.^:_1 will convert sparse to dense array, so you could store that.
3!:1 will pack the sparse array into binary data (string/literal), and 3!:2 will unpack it. So storing the packed string (hopefully :P) works with 1!:2 $.(^:_1) (3!:2) 3!:1 $. i. 3 4 0 1 2 3 4 5 6 7 8 9 10 11 ----- Original Message ---- From: kamakura <[EMAIL PROTECTED]> To: Programming forum <[email protected]> Sent: Friday, April 6, 2007 7:23:57 PM Subject: [Jprogramming] saving sparse arrays Hi, I have just started to learn J language. It is interesting but difficult to read tacit form of programming. Sparse arrays in J are very convenient for handling large sparse matrices. Does anyone know how to save the sparse arrays and restore them to the sparse arrays? +++++++++++++++++++++++++++++ Toshinari Kamakura Chuo University 1-13-27 Kasuga Bunkyo-ku Tokyo 112-8551, Japan ++++++++++++++++++++++++++++++ ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
