[GRASS-dev] using rand(x,y) in r.mapcalc (grass7)

[Vaclav Petras]

On Tue, Jul 22, 2014 at 4:58 PM, Glynn Clements <glynn at gclements.plus.com>
wrote:

> 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.
>

This looks very good at first glance.
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