atoti.function.at module

atoti.at(measure, coordinates)

Return a measure equal to the passed measure at some other coordinates of the cube.

Parameters

• measure (MeasureDescription) – The measure to take at other coordinates.

• coordinates (Mapping[Level, Any]) –

  A {level_to_shift_on: value_to_shift_to} mapping.

  >>> df = pd.DataFrame(
  ...     columns=[
  ...         "Country",
  ...         "City",
  ...         "Target Country",
  ...         "Target City",
  ...         "Quantity",
  ...     ],
  ...     data=[
  ...         ("Germany", "Berlin", "UK", "London", 15),
  ...         ("UK", "London", "Germany", "Berlin", 24),
  ...         ("USA", "New York", "UK", "London", 10),
  ...         ("USA", "New York", "France", "Paris", 3),
  ...         ("USA", "Seattle", "Germany", "Berlin", 3),
  ...     ],
  ... )
  >>> table = session.read_pandas(
  ...     df, table_name="At", hierarchized_columns=[]
  ... )
  >>> cube = session.create_cube(table)
  >>> h, l, m = cube.hierarchies, cube.levels, cube.measures
  >>> h["Geography"] = [table["Country"], table["City"]]
  >>> h["Target Geography"] = [
  ...     table["Target Country"],
  ...     table["Target City"],
  ... ]
  >>> # Using a constant matching an existing member of the key level
  >>> m["USA quantity"] = tt.at(
  ...     m["Quantity.SUM"], {l["Country"]: "USA"}
  ... )
  >>> cube.query(
  ...     m["Quantity.SUM"],
  ...     m["USA quantity"],
  ...     levels=[l["Country"]],
  ... )
          Quantity.SUM USA quantity
  Country
  Germany           15           16
  UK                24           16
  USA               16           16
  >>> # Using another level whose current member the key level will be shifted to
  >>> m["Target quantity"] = tt.at(
  ...     m["Quantity.SUM"],
  ...     {
  ...         l["Country"]: l["Target Country"],
  ...         l["City"]: l["Target City"],
  ...     },
  ... )
  >>> cube.query(
  ...     m["Quantity.SUM"],
  ...     m["Target quantity"],
  ...     levels=[l["City"], l["Target City"]],
  ... )
                                              Quantity.SUM Target quantity
  Country City     Target Country Target City
  Germany Berlin   UK             London                15              24
  UK      London   Germany        Berlin                24              15
  USA     New York France         Paris                  3
                   UK             London                10              24
          Seattle  Germany        Berlin                 3              15
  

  If this other level is not expressed, the shifting will not be done.

Return type

MeasureDescription