I thought that possibly sparse matrices might be a way to handle missing values, particularly if there a lot of undefined values. But couldn't figure out how to specify the sparse element to be _. .
On Wed, Sep 20, 2017 at 3:22 PM, Henry Rich <[email protected]> wrote: > No; see > > http://code.jsoftware.com/wiki/Vocabulary/under Details > > http://code.jsoftware.com/wiki/Vocabulary/percent#dyadic Details > > It would perhaps be better if 0 * _5 gave -0, but it doesn't. The other > deviations are improvements added by J. > > Henry Rich > > On Wed, Sep 20, 2017 at 10:51 AM, Erling Hellenäs < > [email protected]> > wrote: > > > Hi all ! > > > > Here is part of the standard. Required exception handling. Things I > > discuss in my post. Is it implemented in J? > https://en.wikipedia.org/wiki/ > > IEEE_754#Exception_handling > > The floating point standard is obviously used in environments where the > > users can not afford random results, so there must be solutions to the > > problems I mention, which we also can see in this wikipedia article. > > > > Cheers, > > Erling > > > > > > Den 2017-09-20 kl. 16:27, skrev Erling Hellenäs: > > > >> I hope others want to read my post even if Raul discards it as not > worthy > >> of comments. /Erling > >> > >> > >> Den 2017-09-20 kl. 12:25, skrev Raul Miller: > >> > >>> This isn't just J - this is the IEEE-754 floating point standard. > >>> > >>> It would be really nice if computers could deal with infinities, > >>> instantly, at no cost. Sadly, though, that's not going to happen. > >>> > >>> FYI, > >>> > >>> > >> ---------------------------------------------------------------------- > >> For information about J forums see http://www.jsoftware.com/forums.htm > >> > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
