Write a formula to the specified row and column (zero indexed). In case of error it will write the error message (instead of the formula) in the corresponding row and column.
integer $row - Zero indexed row
integer $col - Zero indexed column
string $formula - The formula text string
mixed $format - The optional XF format
integer - 0 for normal termination, -1 for an error in the formula, -2 for row or column out of range.
This function can not be called statically.
Formulas must start with an equal sign ('=').
Arguments given to an Excel function should be separated by comas (','), not by semicolons (';').
Example 29-1. Using writeFormula()
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