[amibroker] how to realize zig function DIFF_METHODs?

["carreyxu" <carreyxu@xxxxxxxxx>]

Is there possible way change zig function from percent method to points 
method.Like metastock zig function.
Metastock:
SYNTAX      zig( DATA ARRAY, MINIMUM CHANGE, DIFF_METHOD )

FUNCTION      Calculates the MINIMUM CHANGE predefined Zig Zag 
indicator of DATA ARRAY using the DIFF_METHOD method of calculation. 

Valid DIFF_METHODs are PERCENT and POINTS (these can be abbreviated as 
% and $). 





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