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Data manipulation inside Customfactor definition

Hi,

I like to do some data manipulation (e.g. resample) inside a customfactor. I have two problems:

  1. Suppose I use inputs = [USEquityPricing.close], when I print the length of assets inside its def, I got 1722. Does it mean USEquityPricing.close only support 1722 stocks?

  2. When I force close to do resample, I got a message saying ndarray has no resample (), so I know close is a ndarray. If I want to resample close to monthly data inside, how can I do that?

Thanks