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Performance: Speed up of deepcopy for Miller #461

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Performance: Speed up of deepcopy for Miller #461

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5 changes: 4 additions & 1 deletion orix/vector/miller.py
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Original file line number Diff line number Diff line change
Expand Up @@ -426,7 +426,10 @@ def from_min_dspacing(

def deepcopy(self) -> Miller:
"""Return a deepcopy of the instance."""
return deepcopy(self)
data = deepcopy(self.data) # Otherwise, data is a view
copied = self.__class__(xyz=data, phase=self.phase) # deepcopy is slow.
copied.coordinate_format = self.coordinate_format
return copied

def round(self, max_index: int = 20) -> Miller:
"""Round a set of index triplet (Miller) or quartet
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