Bill,  it worked with one change:

while. 0{:: 'c h d nd'=. (libz,' gzread ',cv,' i x *c i') cd h;d;#d do.

On 9/20/2018 18:44, bill lam wrote:
while. 0{:: 'c h d nd'=. (libz,' gzread cv,' i x *c i') cd h;d;#d do.
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