HistogramRule class

Allows you to organize the numeric values in a source data column into buckets of a constant size.

All values from HistogramRule.start to HistogramRule.end are placed into groups of size HistogramRule.interval. In addition, all values below HistogramRule.start are placed in one group, and all values above HistogramRule.end are placed in another. Only HistogramRule.interval is required, though if HistogramRule.start and HistogramRule.end are both provided, HistogramRule.start must be less than HistogramRule.end. For example, a pivot table showing average purchase amount by age that has 50+ rows: +-----+-------------------+ | Age | AVERAGE of Amount | +-----+-------------------+ | 16 | $27.13 | | 17 | $5.24 | | 18 | $20.15 | ... +-----+-------------------+ could be turned into a pivot table that looks like the one below by applying a histogram group rule with a HistogramRule.start of 25, an HistogramRule.interval of 20, and an HistogramRule.end of 65. +-------------+-------------------+ | Grouped Age | AVERAGE of Amount | +-------------+-------------------+ | < 25 | $19.34 | | 25-45 | $31.43 | | 45-65 | $35.87 | | > 65 | $27.55 | +-------------+-------------------+ | Grand Total | $29.12 | +-------------+-------------------+

Constructors

HistogramRule({double? end, double? interval, double? start})

HistogramRule.fromJson(Map json_)

Properties

end ↔ double?

The maximum value at which items are placed into buckets of constant size.

getter/setter pair

hashCode → int

The hash code for this object.

no setter, inherited

interval ↔ double?

The size of the buckets that are created.

getter/setter pair

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

start ↔ double?

The minimum value at which items are placed into buckets of constant size.

getter/setter pair

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toJson() → Map<String, dynamic>

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited