# Cyclic references in Excel, Excel for Android and Excel online

Excel Version
1. 365
2. 2019
3. 2016
4. 2013
Cyclic references do show up. It is not difficult to inadvertedly create one.

• Excel for desktop most of the time tells us about the fact immediately and demonstrates where the cycle is. However, if the cycle is created by values which are spilled to neighboring cells, we get only a warning, but Excel's built-in error checker does not show the cycle.
• Excel for Android tells us about that, but does not locate the cycle.
• Excel online does not tell us anything, but silently refuses to recalculate all cells on the cycle and ones that depend on them.
• However, even Excel for desktop and for Android stop recalculating affected formulas and issuing warnings about subsequent cycles, if we ignore the first pop-up.

This short article describes what to do in order to get always a warning and a location of the cycle.

Let us first start with a small calculation, where data changes can introduce a lot of mess, including cyclic references of various kinds.

Book1
ABC
1Work area, where cycles might emerge
2220
3211
4331
Sheet1
Cell Formulas
RangeFormula
A2:A4A2=OFFSET(\$A\$1,B2,C2,1,1)

It is clearly impossible to get warnings about cycles by formulas, because any formula which depends on a cycle will not be recomputed. However, there is another mechanism, which keeps working even for cells which are parts of cycles. It is conditional formatting and we use it in our solution.

We can construct warnings for individual cells, and for whole ranges. The following example shows both types.

Book1
ABCDEF
1Work area, where cycles might emergeCell-level warningRange-level warningReference cell
21102020-01-01 17:43:312020-01-01 17:43:312020-01-01 17:43:35
32212020-01-01 17:43:35
43312020-01-01 17:43:35
Sheet1
Cell Formulas
RangeFormula
E2E2=IF(COUNTA(A2:C4)=COUNTA(A2:C4),\$F\$2,\$F\$2)
F2F2=NOW()
A2:A4A2=OFFSET(\$A\$1,B2,C2,1,1)
D2:D4D2=IF(ISERROR(A2),\$F\$2,\$F\$2)
Cells with Conditional Formatting
CellConditionCell FormatStop If True
E2Cell Value<\$F\$2textNO
D2:D4Cell Value<\$F\$2textNO

We need a formula which will produce a new value whenever it is recomputed. NOW() is a good candidate, and we will use it.
All warnings share the reference cell `F2`, which includes this function.

Let us consider cell `D2`. It serves as a warning for cell `A2`. Its formula `=IF(ISERROR(A2);\$F\$2;\$F\$2)` depends on `A2`. The `ISERROR` function is used to assure identical bahvior no matter if `A2` is an error value or not. If after a change to the spreadsheet that cell is a part of a cycle or depends on one, the following cascade of events is triggered:
1. The spreadsheet is recomputed, including an update to `F2`, whose value increases.
2. Neither `A2` nor `D2` are recomputed, due to the cycle being there.
3. The new value in `F2` becomes larger than the value in `D2`, hence conditional formatting is applied to `D2`, indicating that cycle.
If after a change to the spreadsheet `A2` is neither a part of a cycle nor depends on one, the following cascade of events is triggered:
1. The spreadsheet is recomputed, including an update to `F2`, whose value increases.
2. `A2` and `D2` are recomputed, too, and moreover after `F2`, due to data dependence.
3. The value in `F2` cannot be larger than the value in `D2`, hence conditional formatting is not applied to `D2` and there is no warning about a cycle affecting `A2`.
The range level warning in `E2` works very much the same, except that its formula depends on the whole range it controls. `COUNTA` is used to set up this dependence, being a function which never evaluates to an error, even if there are errors among its arguments.

Jerzy Tyszkiewicz
Author
J.Ty.
Views
1,724
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