I just looked and this is already http://trac.sagemath.org/sage_trac/ticket/658
I added my comments to that ticket. On 10/8/07, William Stein <[EMAIL PROTECTED]> wrote: > On 10/8/07, mabshoff <[EMAIL PROTECTED]> wrote: > > On Oct 8, 3:31 pm, David Harvey <[EMAIL PROTECTED]> wrote: > > > > Hello David, > > > > > When I start up sage, I get different random number seeds every time, > > > e.g. > > > > > > $ ./sage > > > sage: ZZ.random_element() > > > 2 > > > > > > ..... > > > > > > $ ./sage > > > sage: ZZ.random_element() > > > -4 > > > > > > The seeding --- at least for this case --- seems to be happening in > > > random.pxi. > > > > > > We *really* need a way of specifying a random seed at startup. > > > > > > > When we fixed all the leaks in the random seed code William wrote some > > code to specify the random seed via an environment variable. I grepped > > $SAGE_LOCAL/bin and couldn't find anything, so maybe it wasn't merged. > > I removed it because the implementation was way too hack-ish. It was > mainly for experimenting. > > I do encourage David to open a trac ticket about this. He's right that > seeding the random number generator should be possible via a command > line argument at startup. > > One perhaps reasonable way to do this is by setting an environment variable > in local/bin/sage-sage if a certain command line option is set, then in > ext/random.pxi (and anywhere else), somehow using that environment variable > (if set) to seed the random number generator. The tricky part is one has > to also make sure in all cases that all seeding is done from one place, and > that the random seed is easily available from Sage on startup or in > crash messages. > > William > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
