On Dec 21, 2007 3:22 PM, Jack Andrews <[EMAIL PROTECTED]> wrote:
> ...
> upper=: (a.,~a.{~65+i.26) {~ (a.,~a.{~97+i.26) i. ]
> lower=: (a.,~a.{~97+i.26) {~ (a.,~a.{~65+i.26) i. ]
>
> seems a little unwieldy... are there better ways?
One nice feature of these definitions is that you don't need
them both, as they are the inverse of each other -- which is
really to be expected of such operations:
(upper -: lower inv) a.
1
(lower -: upper inv) a.
1
So, you could define e.g.
lower=: upper inv
Boyko
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