A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
On Excel for iOS, the full circular-reference auditing tools available in the desktop version are not provided. If Excel detects a circular reference, it may display a warning, but finding an indirect circular reference can be difficult on the iPhone or iPad.
A direct circular reference is straightforward. For example, if cell A1 contains:
=A1+B1
then A1 refers to itself.
An indirect circular reference is more difficult because the loop can involve several cells:
A1 → B1 → C1 → D1 → A1
For example:
A1: =B1+C1
B1: =D1*2
D1: =A1/2
Here, A1 → B1 → D1 → A1 creates the circular reference.
If you are restricted to iOS, you might want to start with cells whose formulas were recently changed or that produce unexpected results, examine the formula in the formula bar, and follow each referenced cell. Keep following the references until you either reach a cell with no dependency on the original cell or return to the starting cell. If the workbook is large, opening it in Excel on Windows or Mac is much easier because the desktop version can identify circular references and trace the precedent/dependent chain.
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hth
Marcin