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"""
x=CreateGenerator(seed) creates an random number generator stream
seed < 0 ==> Use the default initial seed value.
seed = 0 ==> Set a "random" value for the seed from the system clock.
seed > 0 ==> Set seed directly (32 bits only).
x.ranf() samples from that stream.
x.sample(n) returns a vector from that stream.
ranf() returns a stream of random numbers
random_sample(n) returns a vector of length n filled with random numbers
"""
import Numeric
from RNG import *
standard_generator = CreateGenerator(-1)
def ranf():
"ranf() = a random number from the standard generator."
return standard_generator.ranf()
def random_sample(*n):
"""random_sample(n) = array of n random numbers;
random_sample(n1, n2, ...)= random array of shape (n1, n2, ..)"""
if not n:
return standard_generator.sample(1)
m = 1
for i in n:
m = m * i
return Numeric.reshape (standard_generator.sample(m), n)
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