[GRASS-dev] using rand(x,y) in r.mapcalc (grass7)
glynn at gclements.plus.com
Tue Jul 22 13:58:43 PDT 2014
Markus Neteler wrote:
> - if the user needs reproducability, then have a env var to enable that.
And when issue of usability doesn't even get considered until a few
years later when the user (or a colleague) gets an email suggesting
the results can't be be reproduced ...?
I'm inclined to add both an option (to specify a seed, replacing the
environment variable) and a flag (to seed from the system clock or
whatever), and having the PRNG generate a fatal error if neither of
those are used.
That way, neither of the likely problems can arise by oversight.
Glynn Clements <glynn at gclements.plus.com>
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