> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Evaluate Field

<CardGroup cols={2}>
  <Card title="Scalar Field, Points" href="#scalar-field-points" />

  <Card title="Scalar Field, Point" href="#scalar-field-point" />

  <Card title="Vector Field, Points" href="#vector-field-points" />

  <Card title="Vector Field, Point" href="#vector-field-point" />
</CardGroup>

***

## About this Block

**What it does:** Evaluates the field at a specified point (or multiple points) and returns the value as a property within the block.

**Common uses:**

* Turning a field into a **Point Map**.

**Tips:**

* To run the block, provide a Field and a Point (or Point List) in which to probe the Field values.
* Turn the evaluated field of Point Lists into a **Point Map** to visualize and analyze the results.
* Similar to using the Field Viewer with the Probe Values option, but the returned value is a property.

## Example File

Download Example: [Evaluate Fields](https://storage.googleapis.com/files-learn/static/ExtendedBlockDocs/evaluate_field.ntop)
![Example Screenshot](https://storage.googleapis.com/files-learn/static/ExtendedBlockDocs/evaluate_field.jpg)

***

<h2 id="scalar-field-points">
  Scalar Field, Points
</h2>

Return the Scalar values at specified locations of a Scalar Field.

### Inputs

| Name         | Type                                                               | Description               |
| ------------ | ------------------------------------------------------------------ | ------------------------- |
| Scalar field | [Scalar Field](../../../../block-documentation/types/scalar-field) | Scalar Field to evaluate. |
| Points       | [Point List](../../../../block-documentation/types/point)          | Locations to evaluate.    |

### Outputs

| Type                                                        |
| ----------------------------------------------------------- |
| [Scalar List](../../../../block-documentation/types/scalar) |

***

<h2 id="scalar-field-point">
  Scalar Field, Point
</h2>

Return the Scalar value at a specified location of a Scalar Field.

### Inputs

| Name         | Type                                                               | Description               |
| ------------ | ------------------------------------------------------------------ | ------------------------- |
| Scalar field | [Scalar Field](../../../../block-documentation/types/scalar-field) | Scalar Field to evaluate. |
| Point        | [Point](../../../../block-documentation/types/point)               | Location to evaluate.     |

### Outputs

| Type                                                   |
| ------------------------------------------------------ |
| [Scalar](../../../../block-documentation/types/scalar) |

***

<h2 id="vector-field-points">
  Vector Field, Points
</h2>

Return the Vector values at specified locations of a Vector Field.

### Inputs

| Name         | Type                                                               | Description               |
| ------------ | ------------------------------------------------------------------ | ------------------------- |
| Vector field | [Vector Field](../../../../block-documentation/types/vector-field) | Vector Field to evaluate. |
| Points       | [Point List](../../../../block-documentation/types/point)          | Locations to evaluate.    |

### Outputs

| Type                                                        |
| ----------------------------------------------------------- |
| [Vector List](../../../../block-documentation/types/vector) |

***

<h2 id="vector-field-point">
  Vector Field, Point
</h2>

Return the Vector value at a specified location of a Vector Field.

### Inputs

| Name         | Type                                                               | Description               |
| ------------ | ------------------------------------------------------------------ | ------------------------- |
| Vector field | [Vector Field](../../../../block-documentation/types/vector-field) | Vector Field to evaluate. |
| Point        | [Point](../../../../block-documentation/types/point)               | Location to evaluate.     |

### Outputs

| Type                                                   |
| ------------------------------------------------------ |
| [Vector](../../../../block-documentation/types/vector) |