Thanks, Björn, Dan, and Brian. Grid is cool, Dan's first tab is what I needed, I hoped to avoid using the code for table. /Kip

Dan Bron wrote:
Kip Murray wrote:
 write an adverb tab so that
    -tab~ i.4
 -|0  1  2  3
 -+----------
 0|0 _1 _2 _3
 1|1  0 _1 _2
 2|2  1  0 _1
 3|3  2  1  0

Well, if you already have  myst  then it's easy:

     tab  =:  1 : 'myst@:(u table)'

if you're asking for a tacit version, then

     tab  =:  table (myst@:)

If you're asking for full implementations, then:

     tab  =:  1 : ' (< 2 # << 0 _1 ) { ":@:(u table)'

or, tacitly:
tab =: table (((< 2 # << 0 _1 ) { ":)@:)

-Dan

PS:  I did note that your results had leading and trailing empty lines.  I
presume this is because your  myst  replaces the undesirable formatting
with spaces, rather than removing it altogether, as my implementations do.
If you want that behavior, you can use  (' ' (<a:;0 _1)} ' ' 0 _1}   in
place of  (< 2 # << 0 _1 ) {  in my implementations.
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