_copyto(a, val, mask)
Array or numpy scalar some of whose values are to be replaced by val.
Value used a replacement.
Boolean array. Where True the corresponding element of a is replaced by :None:None:`val`. Broadcasts.
Array with elements replaced or scalar :None:None:`val`.
Replace values in a with NaN where :None:None:`mask` is True. This differs from copyto in that it will deal with the case where a is a numpy scalar.
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