RE: same random numbers??

From: JC Gumbart (
Date: Fri Jan 06 2006 - 23:40:53 CST

There is a seed option in namd to choose the first "random" number yourself;
it's described here:

As for where they come from, the number chosen by NAMD as the seed value is
just the Unix time (measured in seconds from 1970, I believe). This is a
very common method for generating random numbers. But it's also why if you
have simulations starting at the same time, you get the same seed.

-----Original Message-----
From: [] On Behalf
Of Shahid Qamar
Sent: Friday, January 06, 2006 3:49 PM
Subject: namd-l: same random numbers??

I am running a simulation for 100 times on 100 independent CPUs with a qsub
I am trying to get some statistics. When I look at the random number
generator I found that same random numbers are generated many times which
gives me same output result. The numbers attached in text file. So my
question is that why I am getting same random numbers many times and is
there anyway I can get rid of this problem?

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