By definition, the special floating-point value NaN is not equal to itself: NaN == NaN returns false. So now I'm betting the value at the unequal index is NaN . You may want to print out the value at the index where the value's not equal to itself, rather than using assert .
Is enough memory allocated for both E and E_new (i.e. Is there any chance one or other has written over the end of the array and something else has subsequently trashed what was there? Do E and E_new overlap in memory?
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