Members of the Forum -
I have a small practical puzzle - I have a solution for it but am wondering
if there's a better one.
When I work with .JPG files from my digital camera, I'll sometimes use the
sequence numbers embedded in the names, typically something like this:
DSCF8950.JPG
DSCF8953.JPG
DSCF8957.JPG
and so on. The problem with using this for sequencing is that sometimes the
numbers roll over, e.g. 9998, 9999 is followed by 0, 1, 2 etc. What's a
good way to detect this? The sequence of numbers will have gaps because I
delete pictures from the camera before downloading the files, so sequence
might be 9995, 9998, 3, 5, 12....
Currently, I have an expression, where "nn" is the vector of numbers
extracted from the file names, like this:
if. (nn+./ . >5000)*.nn+./ . <999 do. NB. Numbers >9999 and restarted at
0?
nn=. nn+10000*nn<:5000 end.
but it's less than elegant, particularly because of the embedded, arbitrary
limits of 5000 and 999. I chose these based on the number of pictures I
might take in one batch versus the number I might have deleted. So, this
assumes I'll never hit the roll-over point, take more than 999 more
pictures, then discard those numbered 0 to 999. If I did, this check would
fail even though it shouldn't. I'm assuming this is unlikely, but it isn't
impossible.
Any ideas?
Regards,
Devon
--
Devon McCormick, CFA
^me^ at acm.
org is my
preferred e-mail
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