Computes a histogram of the values found in a list, and returns these in a new list attribute on the feature.
Parameters
Source List Attribute
The source list from which the histogram will be computed.
Histogram List Name
The name of the new list attribute that will contain the output histogram. The new list will be sorted so that the value with the most occurrences will be first.
Usage Notes
If the source list did not have elements, a new list will not be created and this transformer will have made no changes to the feature.
Example
If a feature with this list enters this transformer:
somelist{0}.val = 'apple'
somelist{1}.val = 'donut'
somelist{2}.val = 'aardvark'
somelist{3}.val = 'apple'
somelist{4}.val = 'aardvark'
somelist{5}.val = 'apple'
the resulting feature will have this list attribute:
_histogram{0}.value = 'apple'
_histogram{0}.count = 3
_histogram{1}.value = 'aardvark'
_histogram{1}.count = 2
_histogram{2}.value = 'donut'
_histogram{2}.count = 1
Editing Transformer Parameters
Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click 
beside the applicable parameter. For more information, see Transformer Parameter Menu Options.
Transformer Categories
Technical History
Associated FME function or factory: @TCL
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