Return element-wise string concatenation for two arrays of str or unicode.
Arrays x1 and x2 must have the same shape.
- Parameters:
- x1array_like of str or unicode
Input array.
- x2array_like of str or unicode
Input array.
- Returns:
- addndarray
Output array of string_ or unicode_, depending on input types
of the same shape as x1 and x2.