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For analytical modeling with Dynamo, use these nodes to check and clear filter lists and get element values.

FilterElements.GetParameterValueById Gets the value of one of the element's parameters using the parameter ID
Library		Dynamo4AM → Utilities → FilterElements
Input	element	Element to get the parameter value from.
Output	parameterID	The ID of the parameter.
	parameterValue	Value of one of the element's parameters of the given ID.
Remarks		The alternative node to Dynamo's GetParameterValueByName
FilterElements.ClearIfTrue Clears the list if Boolean value is true
Library		Dynamo4AM → Utilities → FilterElements
Input	obj	List to check for clearing.
Output	boolean	Boolean value determining if the list should be cleared.
	var[]..[]	The original list if Boolean is true, empty list if Boolean is false.
FilterElements.ClearIfFalse Clears the list if Boolean value is false
Library		Dynamo4AM → Utilities → FilterElements
Input	obj	List to check for clearing.
Output	boolean	Boolean value determining if the list should not be cleared.
	var[]..[]	The original list if Boolean is false, empty list if Boolean is true.