I've been having trouble passing info around in my algorithm between methods, but I finally figured something out. I wanted some more info out of my custom factor than just the array value. Here is what worked. Hope it helps. I'm interested to here if there are other ways, or if it helped you.
ctx = {}
class cust(CustomFactor):
def compute(self, today, asset_ids, out, values):
for ind in xrange(0, 300)
out[ind] = 1
ctx['other'] = 14
May also look at this post for more info on passing 'global' info https://www.quantopian.com/posts/why-is-context-dot-constant-preferred-vs-simply-defining-a-global-constant
Be careful with globals and Pipeline. For example, see:
https://www.quantopian.com/posts/feed-current-portfolio-weights-into-pipeline-custom-factor
Pipeline does this batching thing and odd behavior can result if you use globals in a dynamic fashion.
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