How can I add group of cells where the formula results in those cells aren't " "?
The problem I'm having is this: when adding a group of cells (each containing a formula that may output a number or " ") are returning an error since it contains a formula "string" instead of a number.
Example: Since:
=IF(($C13>0),($C13÷$F$9)," ")
returns an empty cell, I get an error saying that cell cannot be used to sum a group of cells.
ERROR MESSAGE: "The operator "+" expects a number, date or duration, but the [" "] cell contains a string."
Thank you for your help!
MacBook Pro, OS X Mavericks (10.9.1)