For years, I solved complex spreadsheet problems the same way: adding helper columns, stacking increasingly nested formulas, and, when things became especially tangled, resorting to Excel’s VBA macros ...

Can you chip in? As an independent nonprofit, the Internet Archive is fighting for universal access to quality information. We build and maintain all our own systems, but we don’t charge for access, ...

Here are some examples on how to add data validation to a worksheet. The following code adds a data validation to a range that only allows integer values between 1 and 5. The following code adds a ...