Exactly, thanks. I see that the shape of mat and the like sized matrix of
'J' is
$ mat1,:'J'
2 6 10
so that the 0 or 1 selects from the first dimension...and the verb } vs the
verb { makes it work. Thanks! That is what I couldn't figure out how to
do, thanks again. Having admitted my ignorance in public, I might remember
it.
On Sun, Nov 13, 2011 at 3:27 AM, Ric Sherlock <[email protected]> wrote:
> On Thu, Nov 10, 2011 at 5:54 PM, Nick Simicich <[email protected]> wrote:
> >
> > I have a second question. I wanted to make two x by x matrices, and
> > compare one of those matrices to a scalar, building a single matrix by
> > extracting from each one. What I wanted to do was to code some variation
> > of. I had a matrix where the filled in pieces were ordinary numbers and
> > the placeholders were _. I had a second matrix that had candidates, but
> > they were not
> >
> > (a=b) { mat1,.mat2
> >
>
> Is this the sort of thing you were looking for?
>
> ]mat1=: (6 10?.@$10) { 'abcdefghij'
> egigfigggj
> dcdbjchajf
> hhjheihecb
> baedjdchee
> adhfjgdcic
> adfeaadbfa
> ('j'=mat1)}mat1,:'J'
> egigfigggJ
> dcdbJchaJf
> hhJheihecb
> baedJdchee
> adhfJgdcic
> adfeaadbfa
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
--
Of course I can ride in the carpool lane, officer. Jesus is my constant
companion.
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
