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Version: Java (Groovy)

AggWSum

AggWSum returns an aggregator that computes the weighted sum of values, within an aggregation group, for each input column.

Syntax​

AggWSum(weightColumn, pairs...)

Parameters​

ParameterTypeDescription
weightColumnString

The weight column for the calculation.

pairsString...

The input/output names of source column(s) for the calculations.

  • "X" will output the weighted sum of values in the X column for each group.
  • "Y = X" will output the weighted sum of values in the X column for each group and rename it to Y. "X, A = B" will output the weighted sum of values in the X column for each group and the weighted sum of values in the B column and rename it to A.
caution

If an aggregation does not rename the resulting column, the aggregation column will appear in the output table, not the input column. If multiple aggregations on the same column do not rename the resulting columns, an error will result, because the aggregations are trying to create multiple columns with the same name. For example, in table.aggBy([agg.AggSum(“X”), agg.AggAvg(“X”)]), both the sum and the average aggregators produce column X, which results in an error.

Returns​

An aggregator that computes the weighted sum of values, within an aggregation group, for each input column.

Examples​

In this example, AggWSum returns the weighted sum of values of Number, as weighed by Weight and grouped by X.

import static io.deephaven.api.agg.Aggregation.AggWSum

source = newTable(
    stringCol("X", "A", "B", "A", "C", "B", "A", "B", "B", "C"),
    stringCol("Y", "M", "N", "O", "N", "P", "M", "O", "P", "M"),
    intCol("Number", 55, 76, 20, 130, 230, 50, 73, 137, 214),
    intCol("Weight", 1, 2, 1, 3, 2, 1, 4, 1, 2),
)

result = source.aggBy([AggWSum("Weight", "Number")], "X")

In this example, AggWSum returns the weighted sum of values of Number (renamed to WSumNumber), as weighed by Weight and grouped by X.

import static io.deephaven.api.agg.Aggregation.AggWSum

source = newTable(
    stringCol("X", "A", "B", "A", "C", "B", "A", "B", "B", "C"),
    stringCol("Y", "M", "N", "O", "N", "P", "M", "O", "P", "M"),
    intCol("Number", 55, 76, 20, 130, 230, 50, 73, 137, 214),
    intCol("Weight", 1, 2, 1, 3, 2, 1, 4, 1, 2),
)

result = source.aggBy([AggWSum("Weight", "WSumNumber = Number")], "X")

In this example, AggWSum returns the weighted sum of values of Number (renamed to WSumNumber), as weighed by Weight and grouped by X.

import static io.deephaven.api.agg.Aggregation.AggWSum
import static io.deephaven.api.agg.Aggregation.AggSum

source = newTable(
    stringCol("X", "A", "B", "A", "C", "B", "A", "B", "B", "C"),
    stringCol("Y", "M", "N", "O", "N", "P", "M", "O", "P", "M"),
    intCol("Number", 55, 76, 20, 130, 230, 50, 73, 137, 214),
    intCol("Weight", 1, 2, 1, 3, 2, 1, 4, 1, 2),
)

result = source.aggBy([AggWSum("Weight", "WSumNumber = Number"),AggSum("Sum = Number")], "X")