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automatic updating graphs in excel-40

When a structural change is made to a workbook, for example, when a new formula is entered, Excel reconstructs the dependency tree and calculation chain.

When new data or new formulas are entered, Excel marks all the cells that depend on that new data as needing recalculation. All direct and indirect dependents are marked as dirty so that if B1 depends on A1, and C1 depends on B1, when A1 is changed, both B1 and C1 are marked as dirty.

In this case, the cell that is being calculated and its dependents are moved down the chain.

For this reason, calculation times can often improve in a worksheet that has just been opened in the first few calculation cycles.

If a cell depends, directly or indirectly, on itself, Excel detects the circular reference and warns the user.