By all means put it on the list.
You are selecting along 1 axis from an argument that has 0 axes, which
makes the length error reasonable.
The question is, why does 0 { 0 not fail? Answer: because of the fine
print in the definition. (0 { y) selects item number 0, and an atom has
a single item, itself.
(<0) { 5 fails, rightly, for the same reason 0 {:: 5 fails.
It is important to get these edge cases right, and there's most often
only one right way, so my assumption is that Roger did it the right
way. I'll have to think it over.
Henry Rich
On 9/18/2018 8:05 PM, 'Pascal Jasmin' via Programming wrote:
I can add to request list.
The argument for is that it is a source of "needless" errors. The error
applies also if there is a nested box structure, but the top level is an atom.
Perhaps there is a performance reason against it.
I would doubt that existing code in the wild relies on the error for any other
purpose than to convert the scalar into a list of 1 item.
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