My pleasure Mark, thanks for the feedback. I find that in the process of 
answering questions like this, I help solidify my own understanding so I'm glad 
we were both able to benefit!! 
Ric

> From: Mark Allen
> 
> Ric,
> 
> As another relatively neophyte J-er, I must applaud your exposition in
> that
> it really cleared up for me how +/ worked over square matrices. I had
> always
> in my mind when working on problems thought of +/"1 as 'going across
> the
> rows', and +/"2 as 'going down the columns', which of course worked,
> and of
> course I in some sense knew (as a mantra almost)  that '+/"1 inserts +
> between each rank 1 item of the noun it is applied to',  but your
> explanation and example is clear enough to both make intuitive sense
> and be
> technically accurate. Thank you :)
> 
> 
> On 29 April 2010 22:47, Sherlock, Ric wrote:
> 
> > > From: Robert O'Boyle
> > >
> > > I have come across a feature of J that I didn't expect. When I add
> > > rows of a matrix, I use +/"1

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