Divides element by element the ROI of current data by the memory. If a zero is encountered in the memory data, the output element will be set to -1.7014117e38 and an error message will be output at the end of the operation. If error propagation is being carried out and a zero occurs in a memory element the variance array value is similarly set to -1.7014117e38.
(Overflow and underflow may occur if the numbers are sufficiently large or small.)