Better on big arrays:
(2 _2 {."0/ _1 1) |.!.'x'"1 _ a
This produces shape 2 2 3 4 which you could convert to shape 4 3 4 using
(,/)
Henry Rich
On 1/9/2017 9:07 AM, Skip Cave wrote:
Thanks, Henry! Yes, I meant a shape of 4 3 4.
Skip Cave
Cave Consulting LLC
On Sun, Jan 8, 2017 at 12:28 PM, Henry Rich <[email protected]> wrote:
_1 1 (|.!.'x'"1"0 _ , |.!.'x'"0 _) a
result has shape 4 3 4.
Henry Rich
On 1/8/2017 12:59 PM, Skip Cave wrote:
I have a 3x4 array a:
a
abcd
efgh
ijkl
I want a verb to create an array b that shifts a in 4 directions, and
fills
with 'x', creating a 2x3x4 array
f a
xabc
xefg
xijk
bcdx
fghx
jklx
xxxx
abcd
efgh
efgh
ijkl
xxxx
What is the most efficient J way to do this? The order of the 4 shifts are
not important.
Skip
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