ClassifyLogInterval

classify-functions ClassifyLogInterval

syntax

• ClassifyLogInterval(a, domain-unit)

definition

ClassifyLogInterval(a, domain unit) results in a data-item with class breaks, based on a logarithmic interval distribution of classes. The resulting values-unit is the values unit of data item a, the resulting domain unit is the domain unit argument.

• a: numeric data item to be classified
• domain unit: determining the number of class breaks.

description

An logarithmic interval of classes means the data item to be classified is split up in classes with, as far as possible, an equal logarithmic interval size of each class.

The same function can also be applied from the GUI, by requesting the Palette Editor of a map layer and activate the Classify > Logarithmic Intervals classification.

The ClassifyLogInterval results in a set of ClassBreaks that can be used in the classify function to classify a data item.

applies to

• data item a with Numeric value-type
• domain unit with value type from group CanBeDomainUnit

since version

7.019

example

attribute<nrPersons> classifyLiNrInh (inh_4K) := ClassifyLogInterval(NrInh, inh_4K);

Table inh_4K, nr of rows = 4

Table District, nr of rows = 15