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----- Original Message ----- From: Dan Baronet <[email protected]> Date: Saturday, January 10, 2009 11:40 Subject: Re: [Jprogramming] Matrix spread To: Programming forum <[email protected]> > 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
