Not ugly!

$,+// (|.10^i.4)*/>:i.6
1296  

Linda

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On Wednesday, October 4, 2017 Cliff Reiter <[email protected]> wrote:
I was stunned to see how fast, and on pausing, how beautiful Marshall's were. 
Very unusual and powerful uses of insert. > I doubt you'll find a much faster J 
solution than: > > ,(+/~10&*)/ 4#,:>:i.6 > > or the uglier but slightly quicker 
> > ,+// (10<.@^i._4)*/>:i.6 But the problem is structural, not numeric, which 
attracted me to catalog. 

On 10/4/2017 6:28 PM, 'Skip Cave' via Programming wrote: > I was stunned by 
Cliff's cool use of catalog (catalogue?) I had not really > grasped the 
capabilities of the monadic use of '{' on boxed arguments. I > had always used 
{ dyadically as 'from' > > 2 { 1 2 3 > > 3 > > > This was a revelation: > > > 
{2#<'123' > > ┌──┬──┬──┐ > > │11│12│13│ > > ├──┼──┼──┤ > > │21│22│23│ > > 
├──┼──┼──┤ > > │31│32│33│ > > └──┴──┴──┘ > > > ​Skip​ > > > Skip Cave > Cave 
Consulting LLC > > On Tue, Oct 3, 2017 at 10:21 PM, Cliff Reiter 
<[email protected]> wrote: > >> A cheat (?) that builds instead of 
"removing" >> >> z=.,".>{4#<'123456' >> $z >> 1296 >> 10{.z >> 1111 1112 1113 
1114 1115 1116 1121 1122 1123 1124 >> >> >> >> On 10/3/2017 4:16 PM, Skip Cave 
wrote: >> >>> Another interesting Quora problem: >>> >>> Given the integers 
from 1000 to 9999, remove all integers that contain a >>> 7, >>> 8, 9, or zero, 
and list the remaining integers. >>> >>> Skip >>> 
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