atoti.math.erf module

atoti.math.erf(measure, /)

Return the error function of the input measure.

This can be used to compute traditional statistical measures such as the cumulative standard normal distribution.

For more information read:

• Python’s built-in math.erf()

• scipy.special.erf

• The Wikipedia page

Example

>>> df = pd.DataFrame(
...     columns=["City", "A", "B", "C", "D"],
...     data=[
...         ("Berlin", 15.0, 10.0, 10.1, 1.0),
...         ("London", 24.0, 16.0, 20.5, 3.14),
...         ("New York", -27.0, 15.0, 30.7, 10.0),
...         ("Paris", 0.0, 0.0, 0.0, 0.0),
...     ],
... )
>>> table = session.read_pandas(df, keys=["City"], table_name="Math")
>>> cube = session.create_cube(table)
>>> l, m = cube.levels, cube.measures
>>> m["erf"] = tt.math.erf(m["D.SUM"])
>>> m["erf"].formatter = "DOUBLE[#,##0.000000]"
>>> cube.query(m["D.SUM"], m["erf"], levels=[l["City"]])
          D.SUM       erf
City
Berlin     1.00  0.842701
London     3.14  0.999991
New York  10.00  1.000000
Paris       .00  0.000000

Return type:

MeasureDescription