the fate of hist

[ozgurakgun]

Originally reported by: Özgür Akgün (Bitbucket: ozgurakgun, GitHub: ozgurakgun)

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I want it gone. It doesn't seem to add anything over freq, nobody ever used it, is a bit of a headache to implement.

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• Bitbucket: https://bitbucket.org/stacs_cp/conjure-private/issue/43

[ozgurakgun]

There are 3 versions of hist that make sense to me.

1. Has only one argument: the collection of values. Produces a histogram of values in the form of a list-of-pairs, where the first component is the value, and the second component is the count. There are no 0 entries.
2. Has two arguments: the collection of values, and a list of values-of-interest. Produces a histogram of values in the form of a list of counts, one per each entry in the list of values-of-interest argument. This is what's in the Essence paper, page 21, fig 4.
3. Has two arguments: the collection of values, and a list of value-ranges-of-interest (in the form of tuples). Produces a histogram of values in the form of a list of counts, one per each entry in the list of value-ranges-of-interest.

Conjure (tries to) implement number 1 at the moment. I am tempted to provide 2&3 as well, since they can be useful (and to match the paper). I think I'll just overload the operator hist, since the behaviour is entirely dependent on the types of the parameters. More soon.