> For the complete documentation index, see [llms.txt](https://documentation.astera.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.astera.com/astera-data-stack-v9/functions/logical/isrealnumber-anyvalue.md).

# IsRealNumber (AnyValue)

| **Name**    | ***IsRealNumber (Any Value)***                                                 |
| ----------- | ------------------------------------------------------------------------------ |
| Syntax      | IsRealNumber (Any value)                                                       |
| Purpose     | To check whether a given value represents a real number.                       |
| Description | Returns true if the specified value is a real number. Otherwise returns false. |
| Return Type | Boolean                                                                        |
| Parameters  | Value \[System.Object] – Value to be checked                                   |

![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/0%20\(6\)%20\(1\).png)

### **Example**

In this example, we will pass a string value, not a real number, to the function transformation object using a *Variables* object.

Where,

*value* = -√5

<figure><img src="https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/1%20(6)%20(1).png" alt=""><figcaption></figcaption></figure>

In the output window, you can see that the Boolean value, False, has been returned as the specified value is not a real number, rather an irrational value.

![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/2%20\(6\)%20\(1\).png)


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