The problem is that I cant make a1 and a2 sparse, because they consist of boxed strings.
Kairit > > > How should I calculate [the following] for my sparse matrix? > > Bigarr =: a1 =/ a2. > > Well, I would've advised you to first make a1 and a2 sparse > themselves, i.e.: > > a1 =/&:$. a2. > > But, when I tried some experiments: > > a1 =. i. 4000 > a2 =. 60e3 $ 78 > > $ a1 =/ a2 > 4000 60000 > sa1 =. $. a1 > sa2 =. $. a2 > > $ sa1 =/ sa2 > |non-unique sparse elements: scriptd > | $sa1 =/sa2 > |[-7] c:\app\dev\lang\j\601c\temp\13.ijs > > Which looks like a bug (to me), and is reducible to : > > =/~ $. , 1 > |non-unique sparse elements > | =/~$.,1 > -Dan > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
