Dennis,
I assume that there is a set.seed() somewhere in your script, possibly
in something you source()d (hopefully not in anything library()d).
Have you tried successively removing/commenting parts of the script
before the sample() command until the problem goes away? That way you
should be able to pinpoint the offending script command.
Good luck,
Stephan
Dennis Fisher schrieb:
Colleagues,
I have encountered behavior of random number generation that eludes me.
I generate a random integer in a particular range using the following
code:
sample(1000:9999, size=1)
This code exists within a script that starts with the command:
remove(list=ls())
Each time that I run the script, it yields the same random number:
6420.
I thought that the problem might result from deleting the random
seed. However, list=ls() does not include .RandomSeed.
To my surprise, I can't replicate the problem with a 2-line script:
remove(list-ls())
sample(1000:9999, size=1)
Also, the same problem occurs if I use runif instead of sample.
Thoughts?
Dennis
Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-415-564-2220
www.PLessThan.com
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