[Bug-apl] execute each takes exponential time

[Hans-Peter Sorge]

running < ⍎¨ 100000 ⍴'0' >  takes  2 sec
running < ⍎¨ 500000 ⍴'0' >  takes 72 sec

On a Lenovo W520.

The time it takes to convert vectors with >> 500000 elements
is just too much.

Can this be fixed?

Hans-Peter