Take For Loop as an example, the below code simulate the actions above. The purpose of it is to simulate the VBA Loop, but you don’t need to know how to write VBA. The above example demonstrates the mechanism behind the iteration calculation process, but why do we need it? A1 and A2 will only refresh if you edit them. To avoid recalculation, you should change the Workbook Calculation from “Automatic” to “Manual”. That means A1 becomes 39 and A2 becomes 40 for the first recalculation. Note carefully that Workbook Calculation is set to “Automatic” by default.Įvery time you edit any Cell ( Worksheet_Change Event is triggered), Cell A1 and A2 will recalculate one more time based on the previous result. The underlying mechanism for each iteration is shown below. To illustrate how iterative calculation works, follow the below steps.ģ) Set Maximum Iterations to 10, leave Maximum Change default, check the box to enable iterative calculation ResultĪ1 will immediately show 19 and A2 will show 20. “Maximum Change” define the maximum amount of change you will accept between recalculation results, the smaller the slower but more accurate. “Maximum Iterations” define how many times you want to loop the calculation. Since Excel 2007, a new function was introduced to allow circular reference.īelow is a screenshot of Excel 2013, other versions also have the check box “Enable iterative calculation”, check the box to enable. The formula will fail and the below error box will prompt. The above formula refer to each other, this is called circular reference (refer to each other forming a circle). To understand what is Excel iterative calculation, you should first understand what is circular reference.Ĭircular reference happens when you type a formula in one Cell which refers to another Cell, but that Cell also refers back to the Cell. Excel iterative calculation and circular reference
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