The biggest problem remains that 99% of your explanation (and that of others who seem to understand what you want) uses the words of the application domain (statistics, stochastic variables, distributions) in a way that is unhelpful to convey your needs to those who are in a position to implement and support your proposal.
You have had enough opportunities to explain this better, but you've not taken them. That's okay, I don't expect you to give a lecture on stochastic variables and distributions. But it does mean there is a chasm between you (and apparently other users of Simpy and Patsy) and the core developers that seems impossible to bridge. So I think there's little point in continuing. On Mon, Feb 24, 2020 at 9:49 AM Aaron Hall via Python-ideas < python-ideas@python.org> wrote: > The context for this is statistics , so I'll quote Wolfram on tilde in the > context of statistics: http://mathworld.wolfram.com/Tilde.html > > "In statistics, the tilde is frequently used to mean "has the distribution > (of)," for instance, X∼N(0,1) means "the stochastic (random) variable X has > the distribution N(0,1) (the standard normal distribution). If X and Y are > stochastic variables then X∼Y means "X has the same distribution as Y." > > So X~Y is an assertion of a relationship between X and Y. Sympy has an > entire module filled with these distributions. But maybe it's more useful > to say `Z = Normal('Z', 0, 1)` instead of `Z = Z ~ Normal(0, 1)` or maybe > `Z ~= Normal(0, 1)` (Z example from docs, latter tilde examples are mine). > > When we say, in R or Patsy, `y ~ x1 + x2`, we are asserting a relationship > between y and the x's. This instantiates a model/formula (in math, usually > written y = x1 + x2 + e) that, given the asserted relationship and some > assumptions, we can use to find the mathematical relationship between the > variables. > > I think our biggest concern is, what Guido earlier alluded to here, is, is > the operator precedence correct? In R (and Patsy) the binding is the > weakest. In Python, my first inclination is to make it the strongest so we > could coalesce with the `y` object the other variables. But maybe this is > wrong. Maybe it should be a weak binding. Maybe we can't make it weak > because some people think it should have context in integers where it binds > strongly. Maybe Patsy is the right way to do it. Maybe this is ultimately a > bad idea. But I want a record of the discussion and conclusion, and I want > it to be the best reasoned one we can muster. > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/4H7ARXUVS7COAGWPAH3LDGBXK6GYMHJC/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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