Daniel Grochulski writes
> numlist in v(numlist) expands using same convention that the -numlist-
> command uses: list element like 17/22 expands to 17 18 19 20
> 21 22, but
> whenever you use : (colon) it means Stata looks for list
> element like n1 n2
> to n3 and expands 8 17:22 to just 8 17 (because 17 + 9 = 26 and 26 is
> greater than 22). Use of numlists is particularly tricky in
> egen function
I see had not read the applicable online help for -numlist- carefully
1 2 to 4 four numbers, 1, 2, 3, 4
4 3 to 1 four numbers, 4, 3, 2, 1
10 15 to 30 five numbers 10, 15, 20, 25, 30
1 2:4 same as 1 2 to 4
4 3:1 same as 4 3 to 1
10 15:30 same as 10 15 to 30
I looked at the first two examples, saw the pattern therein that
I needed, and assumed I understood it.
I read the first as 1 and the numbers 2 to 4 (i.e, 2, 3, 4).
Likewise, the second as 4 and the numbers 3 to 1 (i.e, 3, 2, 1).
Nowhere did I get the impression from these two examples that it meant
the "first number" plus any multiples of "the second minus the first"
that fell in the range "second to third numbers."
Granted, had I looked at the third example I would have noticed
that the simple pattern of the first two examples no longer worked.
This suggests, perhaps, that the order of the examples may need to
be changed to make it more explicit that it is multiples of the
first gap within the remaining range that is to be generated. Having
a multiple of 1 in the first 2 examples makes this difficult to see.
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