Don,

Wow! I had no idea that Sparse could do that. I've never bothered to read
the full Dictionary entry on Sparse, mostly because I have never needed to
use sparse arrays. I didn't realize that $. was applicable to normal
arrays, or that it could take a left argument.

Skip

On Fri, Nov 30, 2018 at 1:04 PM Don Guinn <[email protected]> wrote:

> Or do
>
>    4 $.$.a
> . ormation about J forums see http://www.jsoftware.com/forums.htm
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For information about J forums see http://www.jsoftware.com/forums.htm

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