i wrote some monte carlo code which obtains a random generator seed
through a read to /dev/random.
on a lark, i did a run:
T: 4.0e+00 beta: 2.500e-01 trials: 1000000
N: 10 M: 10 seed: 208006379
Average Energy: -1.057143
Average magnetization: 0.002008
Average |magnetization|: 0.251765
Average magnetic susceptibility: 8.948655
and then in my code, i commented out the read to /dev/random and
assigned the seed to what it was above, 208006379. i then ran the
program again:
T: 4.0e+00 beta: 2.500e-01 trials: 1000000
N: 10 M: 10 seed: 208006379
Average Energy: -1.050182
Average magnetization: 0.030723
Average |magnetization|: 0.246092
Average magnetic susceptibility: 8.692724
the seed for these two runs is the same. i would've expected that calls
to rand() should've generated the same set of random numbers. yet the
different runs of the monte carlo code yield different results, which is
fine, except i was expecting it to be exactly the same since the seed is
the same.
am i wrong about seeds yielding different sets of random numbers?
any thoughts?
it would be nice to "redo" a run. i was under the impression that for
identical input (just the temperature) and an identical seed, two runs
should be exactly the same...
pete
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