Funny, I see your reply but not my msg. Msgs are sent to my webmail address. I wonder if there are other msgs I am missing... /D
--- On Sat, 1/10/09, Devon McCormick <[email protected]> wrote: > From: Devon McCormick <[email protected]> > Subject: Re: [Jprogramming] Matrix spread > To: "Programming forum" <[email protected]> > Date: Saturday, January 10, 2009, 12:27 PM > Dan - I see your message in my G-mail thread about using > indexing (via > double grade) to achieve insertion. It's not one that > would have occurred > to me. > > Where were you looking to see your message appear? (Oddly, > when I first > glanced at your message yesterday, I thought it was from > Dan Bron.) > > Regards, > > Devon > > On Sat, Jan 10, 2009 at 11:44 AM, Dan Baronet > <[email protected]> wrote: > > > I sent a msg yesterday and I don't see it in the > forum nor has it come back > > to me. Anybody seen it (for this topic)? > > /Dan > > > > --- On Fri, 1/9/09, Devon McCormick > <[email protected]> wrote: > > > > > From: Devon McCormick <[email protected]> > > > Subject: Re: [Jprogramming] Matrix spread > > > To: "Programming forum" > <[email protected]> > > > Date: Friday, January 9, 2009, 5:36 PM > > > This is not as direct as the solutions using > expansion with > > > a complex > > > expander but it's one of those things I > thought of and > > > it worked the first > > > time just as I'd conceived it: concatenation > under > > > rotation: > > > > > > > 0,&.(4&|."1)0,&.(4&|.)>:i.5 5 > > > 1 2 3 4 0 5 > > > 6 7 8 9 0 10 > > > 11 12 13 14 0 15 > > > 16 17 18 19 0 20 > > > 0 0 0 0 0 0 > > > 21 22 23 24 0 25 > > > > > > The only advantage it might have would be for > inserting > > > non-zero rows or > > > columns. > > > > > > The symmetry of inserting both the same row and > column > > > makes me wonder if > > > there's a more general, adverbial method to > do both at > > > once. > > > Experimentation showed me this: > > > > > > (0&,&.(4&|.)) (1 : 'u u"1 > > > y')mat > > > 1 2 3 4 0 5 > > > 6 7 8 9 0 10 > > > 11 12 13 14 0 15 > > > 16 17 18 19 0 20 > > > 0 0 0 0 0 0 > > > 21 22 23 24 0 25 > > > > > > Which extends interestingly (though maybe not > usefully): > > > > > > (0 99&,&.(4&|.)) (1 : 'u > u"1 > > > y')mat > > > 1 2 3 4 0 99 5 > > > 6 7 8 9 0 99 10 > > > 11 12 13 14 0 99 15 > > > 16 17 18 19 0 99 20 > > > 0 99 0 0 0 0 0 > > > 21 22 23 24 0 99 25 > > > > > > On Fri, Jan 9, 2009 at 4:47 PM, Raul Miller > > > <[email protected]> wrote: > > > > > > > On Fri, Jan 9, 2009 at 4:40 PM, Brian Schott > > > <[email protected]> > > > > wrote: > > > > > I think this is more complete. > > > > > > > > > > 1 1 1 1j1 1 #"1]1 1 1 1j1 1 > #>:i. 5 5 > > > > > 1 2 3 4 0 5 > > > > > 6 7 8 9 0 10 > > > > > 11 12 13 14 0 15 > > > > > 16 17 18 19 0 20 > > > > > 0 0 0 0 0 0 > > > > > 21 22 23 24 0 25 > > > > > > > > Yes, thank you, I did not read carefully > enough. > > > > > > > > Or: > > > > m=:1+i.5 5 > > > > b=:1 1 1 1 0 1 > > > > b #inv b#inv"1 m > > > > 1 2 3 4 0 5 > > > > 6 7 8 9 0 10 > > > > 11 12 13 14 0 15 > > > > 16 17 18 19 0 20 > > > > 0 0 0 0 0 0 > > > > 21 22 23 24 0 25 > > > > > > > > -- > > > > Raul > > > > > > > > ---------------------------------------------------------------------- > > > > For information about J forums see > > > http://www.jsoftware.com/forums.htm > > > > > > > > > > > > > > > > -- > > > Devon McCormick, CFA > > > ^me^ at acm. > > > org is my > > > preferred e-mail > > > > ---------------------------------------------------------------------- > > > For information about J forums see > > > http://www.jsoftware.com/forums.htm > > > > > > > > > ---------------------------------------------------------------------- > > For information about J forums see > http://www.jsoftware.com/forums.htm > > > > > > -- > Devon McCormick, CFA > ^me^ at acm. > org is my > preferred e-mail > ---------------------------------------------------------------------- > For information about J forums see > http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
