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clear
Format: clear( namespec )
Arguments: [node] namespec Optional list of node
names; default = all
Returns: [text] The value of namespec if
supplied, otherwise null
Description: Marks all constants specified in namespec
as unevaluated and sets their values to null. Use reset to reset all constants
without removing their values. If namespec is not
provided, all nodes are reset.
Examples: clear("x,y,z")
= clears the nodes x, y, and z
clear = clears all nodes
See Also: reset, remove
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