ExcelマクロVBA再入門 | 第5回.同じ計算を行数分繰り返す（For〜Next） | マクロが覚えられないという初心者向けに理屈抜きのやさしい解説
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Function MyUDF MakeMeVolatile As Boolean As Double ' Good practice to call this on the first line. It also enables you to switch on and off the volatile status of a worksheet function. In the example given earlier, this means B1 is first, and then C1.
In the example given earlier, this means B1 is first, and then C1. These methods have been improved from version to version to allow for finer control. The table is created by using the Data Table Wizard. If the calculation mode is Automatic Except Tables, this calculates those tables that require updating and also all volatile functions and their dependents.
特定セルのみ再計算するExcelマクロ－Range.Calculate - First, the user sets up the calculation of a result on a worksheet. In this case, the cell that is being calculated and its dependents are moved down the chain.
The user runs the command, or does something to cause the command to run so that it is still considered a user action. From this tree, Excel constructs a calculation chain. The calculation chain lists all the cells that contain formulas in the order in which they should be calculated. During recalculation, Excel revises this chain if it comes across a formula that depends on a cell that has not yet been calculated. 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. This is usually an error condition that the user must fix, and Excel provides very helpful graphical and navigational tools to help the user to find the source of the circular dependency. In some cases, you might deliberately want this condition to exist. For example, you might want to run an iterative calculation where the starting point for the next iteration is the result of the previous iteration. Excel supports control of iterative calculations through the calculation options dialog box. In the example given earlier, this means B1 is first, and then C1. This recalculation occurs immediately after Excel finishes marking cells as dirty if the recalculation mode is automatic; otherwise, it occurs later. Dirty, which marks cells as needing calculation. When it is used together with the Range. Calculate method see next section , it enables forced recalculation of cells in a given range. This is useful when you are performing a limited calculation during a macro, where the calculation mode is set to manual, to avoid the overhead of calculating cells unrelated to the macro function. Range calculation methods are not available through the C API. This resulted in some complexity in the way links between worksheets were handled, and required some care to ensure efficient recalculation. In particular, in Excel 2000, you should minimize cross-worksheet dependencies and name worksheets in alphabetical order so that sheets that depend on other sheets come alphabetically after the sheets they depend on. When the calculation finishes evaluating the cells Excel waits for the asynchronous functions to complete if there are still asynchronous functions running. As each asynchronous function reports results, Excel finishes the formula, and then runs a new calculation pass to re-compute cells that use the cell with the reference to the asynchronous function. Excel reevaluates cells that contain volatile functions, together with all dependents, every time that it recalculates. For this reason, too much reliance on volatile functions can make recalculation times slow. By using VBA, the UDF is declared as volatile as follows. Function MyUDF MakeMeVolatile As Boolean As Double ' Good practice to call this on the first line. Excel only learns that a UDF is volatile when it first calls it. A volatile UDF can be changed back to non-volatile as in this example. It also enables you to switch on and off the volatile status of a worksheet function. You can turn this default state off using the xlfVolatile function when the UDF is first called. For very large workbooks, recalculation time might be so long that users must limit when this happens, that is, only recalculating when they need to. To enable this, Excel supports the manual mode. The user can select the mode through the Excel menu system, or programmatically using VBA, COM, or the C API. First, the user sets up the calculation of a result on a worksheet. This depends on one or two key changeable inputs and other parameters. The user can then create a table of results for a set of values for one or both of the key inputs. The table is created by using the Data Table Wizard. After the table is set up, Excel plugs the inputs one-by-one into the calculation and copies the resulting value into the table. As one or two inputs can be used, data tables can be one- or two-dimensional. If the calculation that is used to get the result depends on one or more values from the data table, Excel does not return an error for the circular dependency. To do this, set the calculation mode to Automatic except Data Tables. When calculation is in this mode, the user recalculates the data tables by pressing F9 or some equivalent programmatic operation. These methods have been improved from version to version to allow for finer control. The capabilities of the C API in this regard reflect those that were available in Excel version 5, and so do not give you the same control that you have using VBA in more recent versions. Calculate introduced in Excel 2000, changed in Excel 2007 and Range. Behavior of the Range. Calculate method changed in Excel 2007; however, the old behavior is still supported by the Range. Calculate VBA: Worksheets reference. Reference is the name of the worksheet as a string or the index number in the relevant workbook. Setting this to True from False dirties all cells in the specified worksheet. In automatic modes, this also triggers a recalculation of the whole workbook. If the calculation mode is Automatic Except Tables, this calculates those tables that require updating and also all volatile functions and their dependents. If the calculation mode is Automatic Except Tables, it forces the tables to be recalculated.
First, the user sets up the calculation of a result on a worksheet. The user can then create a table of results for a set of values for one or both of the key inputs. From this tree, Excel constructs a calculation chain. In this case, the cell that is being calculated and its dependents are moved down the chain. Excel supports control of iterative calculations through the calculation options dialog box. A volatile UDF can be changed back to non-volatile as in this example.
