small bug in ess_imse

[magland]

bayes-kit/bayes_kit/ess.py

Lines 124 to 130 in 8f8c494

	prev_min = acor[1] + acor[2]
	# convex minorization uses slow loop
	accum = prev_min
	i = 3
	while i + 1 < n:
	minprev = min(prev_min, acor[i] + acor[i + 1])
	accum = accum + minprev

I think minprev should really be prev_min

[bob-carpenter]

D'oh. I need to keep updating prev_min.

In case you're getting super worried about the shoddy code here, these functions hadn't gone through code review yet and haven't been thoroughly tested. I probably shouldn't have given them to you as reference implementations. That goes for the rest of the repo, too.

So I really appreciate the feedback at this stage.