Its analgesic effects are only partially reversed by naloxone, hence indicating that its opioid action is unlikely the sole factor; tramadol's analgesic effects are also partially reversed by Î±2 adrenergic receptor antagonists like yohimbine and the 5-HT3 receptor antagonist, ondansetron.
Array formulas in versions before Excel 2007 cannot handle whole-column references. In Excel 2007, array formulas can handle whole-column references, but this forces calculation for all the cells in the column, including empty cells. This can be slow to calculate, especially for 1 million rows.
When we refer to a formula as an array formula, we mean that it is a normal Excel formula (SUM, MAX, COUNTIF etc.) but has been modified to take an array or a set of arrays as input. This is what lies at the core of array formulas and makes them so powerful.