jerro:
reduce!reducer(MQ(x.front, 0), zip(x, sequence!"n"))
A small correction : you would need to use x.drop(1) instead of
x, because the first element of x is only used to compute the
initial value of 1. If you wanted k to have the same meaning as
the one in your formula, you would need to use sequence!"n + 2"
instead of sequence!"n".
See enumerate():
http://d.puremagic.com/issues/show_bug.cgi?id=5550
I think with enumerate it becomes:
MQ(x.front, 0).enumerate(1).reduce!reducer()
Bye,
bearophile
