= 3 1 4 1 5 9 1 0 0 0 0 0 0 1 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 = \: 3 1 4 1 5 9 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1
/: would also have worked. On Wed, Feb 26, 2014 at 10:36 PM, Michal Wallace <[email protected]>wrote: > What purpose does the \: serve there? > > (*=) 9 7 5 3 > > 9 0 0 0 > > 0 7 0 0 > > 0 0 5 0 > > 0 0 0 3 > > > > > On Wed, Feb 26, 2014 at 11:48 PM, J. Patrick Harrington > <[email protected]>wrote: > > > even shorter: > > > > diag4=: *=@\: > > > > diag4 9 7 5 3 > > 9 0 0 0 > > 0 7 0 0 > > 0 0 5 0 > > 0 0 0 3 > > Patrick > > > > > > On Wed, 26 Feb 2014, km wrote: > > > >> (*"0 1 =@i.@#) 1 2 3 > >> 1 0 0 > >> 0 2 0 > >> 0 0 3 > >> > >> --Kip Murray > >> > >> Sent from my iPad > >> > >> On Feb 26, 2014, at 9:35 PM, Roger Hui <[email protected]> > >>> wrote: > >>> > >>> diag=: 3 : 'y (,&.>~i.#y)} 0 $~ ,~#y' > >>> diag 10 20 30 40 > >>> 10 0 0 0 > >>> 0 20 0 0 > >>> 0 0 30 0 > >>> 0 0 0 40 > >>> > >>> diag1=: ]\ * =/~@i.@# > >>> diag1 10 20 30 40 > >>> 10 0 0 0 > >>> 0 20 0 0 > >>> 0 0 30 0 > >>> 0 0 0 40 > >>> > >>> diag2=: -@>:@i.@# {."0 ] > >>> diag2 10 20 30 40 > >>> 10 0 0 0 > >>> 0 20 0 0 > >>> 0 0 30 0 > >>> 0 0 0 40 > >>> > >>> diag3=: ,~@# $ ] #~ 1 j. # > >>> diag3 10 20 30 40 > >>> 10 0 0 0 > >>> 0 20 0 0 > >>> 0 0 30 0 > >>> 0 0 0 40 > >>> > >>> > >>> > >>> > >>> > >>> On Wed, Feb 26, 2014 at 7:12 PM, Joe Bogner <[email protected]> > >>>> wrote: > >>>> > >>>> Sorry, I figured it out: > >>>> > >>>> I just needed one more 0... > >>>> > >>>> ] S * (4 4 $ 1 0 0 0 0) > >>>> 4 0 0 0 > >>>> 0 3 0 0 > >>>> 0 0 2.23607 0 > >>>> 0 0 0 0 > >>>> > >>>> On Wed, Feb 26, 2014 at 10:02 PM, Joe Bogner <[email protected]> > >>>>> wrote: > >>>>> I'm experimenting with svd and am looking for a nicer way of creating > >>>>> a matrix from the S diagonal > >>>>> > >>>>> 4 3 2.23607 0 > >>>>> > >>>>> needs to be > >>>>> > >>>>> ] (4 4 $ 4 0 0 0 0 3 0 0 0 0 2.23607 0 0 0 0 0 ) > >>>>> 4 0 0 0 > >>>>> 0 3 0 0 > >>>>> 0 0 2.23607 0 > >>>>> 0 0 0 0 > >>>>> > >>>>> What would be the idiomatic way to make that conversion? I tried > >>>>> various versions of reshape and insert. > >>>>> > >>>>> Not quite... > >>>>> > >>>>> ],\ S > >>>>> 4 0 0 0 > >>>>> 4 3 0 0 > >>>>> 4 3 2.23607 0 > >>>>> 4 3 2.23607 0 > >>>>> > >>>>> I also thought about multiplying it by a diagonal matrix of 0s and 1s > >>>>> but couldn't get that figured out either > >>>>> > >>>>> Thanks > >>>>> Joe > >>>>> > >>>> ---------------------------------------------------------------------- > >>>> 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 > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
