PX ECDF

[nicolaskruchten]

Resolves #3010 and closes #2765 by adding ECDF to PX itself.

[eisenlohr]

Hi @nicolaskruchten,

Many thanks for getting the ECDF functionality integrated into px! In the past, I was using my own hack to accomplish this, so your work is much appreciated. I was wondering whether you would consider adding this little bit (3 lines in the middle):

            if "ecdfmode" in args:
                base = args["x"] if args["orientation"] == "v" else args["y"]
                var = args["x"] if args["orientation"] == "h" else args["y"]
                ascending = args.get("ecdfmode", "standard") != "reversed"
                group = group.sort_values(by=base, ascending=ascending)

                head = group.head(1).copy()
                head['count'] = 0
                group = pd.concat([head,group])

                group_sum = group[var].sum()  # compute here before next line mutates
                group[var] = group[var].cumsum()
                if not ascending:
                    group = group.sort_values(by=base, ascending=True)

to _core.py in order for the ECDF to run between 0 and 1 instead of 1/N and 1?

If you want, I can try to fork, add the above three-line snippet, and put in a pull request. However, I am somewhat concerned that I get tangled up in the procedures of how to contribute to plotly...

[eisenlohr]

The above snippet is too simple and does not consider all cases. I will do a proper pull request!