# Spreadsheet cells not updating

Web based spreadsheets, such as Microsoft Excel Online or Google Sheets are a relatively new category.

A spreadsheet consists of a table of cells arranged into rows and columns and referred to by the X and Y locations.

Besides performing basic arithmetic and mathematical functions, modern spreadsheets provide built-in functions for common financial and statistical operations.

Such calculations as net present value or standard deviation can be applied to tabular data with a pre-programmed function in a formula.

Trust no-one and nothing unless you've seen it with your own eyes - honestly - I've seen "experienced" users do the strangest things... The only cell that I am having problems with is: Example: I need to figure the formula for cost 20%. =sum(d3 20%) I know the formula I just showed is incorrect but its an idea of what I need.

The following day when I looked at the spreadsheets, the formulas were working fine and updating as values changed.

Data might include the string of text in this case, not the formula itself. The key feature of spreadsheets is the ability for a formula to refer to the contents of other cells, which may in turn be the result of a formula.

To make such a formula, one simply replaces a number with a cell reference. But C10 might also hold its own formula referring to other cells, and so on.

This electronic concept of cell references was first introduced in LANPAR (Language for Programming Arrays at Random) (co-invented by Rene Pardo and Remy Landau) and a variant used in Visi Calc, and known as "A1 notation".

Additionally, spreadsheets have the concept of a range, a group of cells, normally contiguous.