The `ISOMITTED` function in Excel is a relatively newer function introduced to work with dynamic arrays and handle optional arguments, particularly in the context of LAMBDA functions. It’s mainly used to determine if a value was omitted in the function call.
Here’s a basic guide on how to use the `ISOMITTED` function in Excel:
Syntax:
ISOMITTED(argument)
- argument: The argument you want to check if it was omitted.
How It Works:
- `ISOMITTED` returns `TRUE` if the specified argument is omitted when the LAMBDA is called, and `FALSE` otherwise.
Typical Use Case:
- LAMBDA functions: Use `ISOMITTED` to handle default values when certain arguments are not passed to a LAMBDA function.
Example:
Suppose you have a LAMBDA function that takes two numbers and returns their sum. But if the second number is omitted, it defaults to 10.
=LAMBDA(a, b, IF(ISOMITTED(b), a + 10, a + b))
- Here, `ISOMITTED(b)` checks if the second argument `b` is not provided. If it is omitted, the function uses `10` as the default value for `b`.
Steps to Use:
- Define a LAMBDA using Excel’s `FORMULAS` > `Name Manager`.
- Create a custom function using `LAMBDA` and `ISOMITTED`.
- Use the custom function in your workbook by calling it like any other Excel function.
Points to Remember:
- `ISOMITTED` is specifically useful in scenarios with optional arguments in dynamic arrays and LAMBDA functions.
- This function is available in Excel 365 and Excel 2021, where dynamic arrays and LAMBDA functions are supported.
The `ISOMITTED` function provides flexibility in defining custom behaviors for dynamic calculations, making it easier to build adaptable functions.
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