wiki page here... hopefully accurate http://www.jsoftware.com/jwiki/PascalJasmin/i_dot_0_and_i_dot_0_0?highlight=%28PascalJasmin%2F%29
--- Henry Rich <[EMAIL PROTECTED]> wrote: > Here's some information; why don't you start a Wiki > page? > > > i. 0 is 0$0 > > i. 0 0 is 0 0 $ 0 > > The display of a rank-2 array is each line, with LF > appended to the end of each line. > > So, for 0 0 $ 0 you get no lines, no LF. > > for 0 $ 0 you get one (empty) line, ended by LF > > > +/ applied to an empty list produces an identity > item: an item made up of identity elements. > > +/ 0 $ 0 the item is a scalar, there are none of > them, > so the result is the identity scalar (shape '') > > $ +/ i. 0 > > > +/ 0 0 $ 0 the item is a 0-length list, there are > none of > them, so the result is an identity item: a > 0-length list > (values are 0 but there are no values): > > $ +/ i. 0 0 > 0 > > > Henry Rich > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On > Behalf Of Pascal Jasmin > > Sent: Monday, September 25, 2006 12:33 PM > > To: Programming forum > > Subject: [Jprogramming] i.0 vs i. 0 0 > > > > in the J console, > > i.0 will return a blank line, while i.0 0 returns > > nothing, and > > > > (i.0) -: i. 0 0 > > 0 > > '' -: i.0 > > 1 > > (i.0) ; i. 0 0 > > ┌┬┐ > > │││ > > └┴┘ > > +/ each (i.0) ; i. 0 0 > > ┌─┬┐ > > │0││ > > └─┴┘ > > I don't really understand the difference between > the 2 > > values, and am surprised by the last result. > > I remember a scattering of references to each i.0 > and > > i. 0 0, and think it should have its own index > page. > > is it as simple as i.0 is empty and i.0 0 is nil? > > > > > > Could you help list where each is used inside J, > and > > when each version is more helpful (or gets you in > less trouble?) > > > > __________________________________________________ > > 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 > > ---------------------------------------------------------------------- > 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
