Fixing set.seed for an entire session

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I am using R to construct an agent based model with a monte carlo process. This means I got many functions that use a random engine of some kind. In order to get reproducible results, I must fix the seed. But, as far as I understand, I must set the seed before every random draw or sample. This is a real pain in the neck. Is there a way to fix the seed?

set.seed(123)
print(sample(1:10,3))
# [1] 3 8 4
print(sample(1:10,3))
# [1]  9 10  1
set.seed(123)
print(sample(1:10,3))
# [1] 3 8 4
agent-based-modeling montecarlo r random
6 Answers

If you want to always return the same results from random processes, simply keep the seed set all the time with:

addTaskCallback(function(...) {set.seed(123);TRUE})

Now the output is the same every time:

print(sample(1:10,3))
# [1] 3 8 4
print(sample(1:10,3))
# [1] 3 8 4
user_57837450
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