On Feb 7, 8:45 pm, duncan smith <buzz...@urubu.freeserve.co.uk> wrote:
[...] > interested, but the following pseudo-python gives the idea. For an [...] > try: > yield rand() < exp(dF / temp) Practically speaking, the condition rand() < exp(dF / temp) is never going to be satisfied if dF / temp < -40 (in fact, the output of rand() is always an exact multiple of 2**-53, so the condition rand() < exp(-40) is identical to the condition rand() == 0.0, which should occur for one random sample out of every 9 thousand million million or so). So assuming that your fitness delta dF can't get smaller than 1e-16 or so in absolute value (which seems reasonable, given that dF is presumably the result of subtracting two numbers of 'normal' magnitude), there would be little point having temp go much smaller than, say, 1e-20. IOW, I agree with Steven: 2.2e-308 seems extreme. -- Mark -- http://mail.python.org/mailman/listinfo/python-list
