I recommend cutting snippets out of your code by stopping the code at the point
of interest and using dput() to pull out "data as it is" before the troublesome
section and then using the reprex package to test that the snippet runs.
Either you will notice the problem on your own while taking thi
Hi,
It isn't at all clear to me what you're trying to do. For one thing,
you never actually add more items to cat.ref in the code snippet you
give.
You do use c() on zx.ref - is that what you mean?
But you aren't adding cat.ref to it, you're adding v$cat.ref, and I
have no idea what that might co
Dear All
My program is long and sorry I do not have a replicable set of codes to
present. But I present a chunk of codes at the end below. Essentially,
1. I initialize cat.ref as NUL (see line 1)
2. Then, I repeatedly add elements to cat.ref, where each element
include parentheses in double qu
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