def __set_formulas(self, formulas):
<EOL>array = tuple(tuple(self._clean_formula(col) for col in row) for row in formulas)<EOL>self._get_target().setFormulaArray(array)<EOL>
Sets formulas in this cell range from an iterable of iterables.

Any cell values can be set using this method. Actual formulas must
start with an equal sign.