# operator +

> Returns the result of a componentwise addition operation on two double3x3 matrices.

## Definition

* **Type:** Operator
* **Namespace:** [Unity.Mathematics](/engine/6000.6/script-reference/unity/mathematics.md)
* **Assembly:** UnityEngine.MathematicsModule

## operator +(double3x3, double3x3)

Returns the result of a componentwise addition operation on two double3x3 matrices.

```csharp
public static double3x3 operator +(double3x3 lhs, double3x3 rhs)
```

### Parameters

**** (\[double3x3]\(/engine/6000.6/script-reference/unity/mathematics/double3x3)): Left hand side double3x3 to use to compute componentwise addition.**** (\[double3x3]\(/engine/6000.6/script-reference/unity/mathematics/double3x3)): Right hand side double3x3 to use to compute componentwise addition.

### Returns

| Type                                                                        | Description                                     |
| --------------------------------------------------------------------------- | ----------------------------------------------- |
| [double3x3](/engine/6000.6/script-reference/unity/mathematics/double3x3.md) | double3x3 result of the componentwise addition. |

## operator +(double3x3, double)

Returns the result of a componentwise addition operation on a double3x3 matrix and a double value.

```csharp
public static double3x3 operator +(double3x3 lhs, double rhs)
```

### Parameters

**** (\[double3x3]\(/engine/6000.6/script-reference/unity/mathematics/double3x3)): Left hand side double3x3 to use to compute componentwise addition.**** (\[double]\(https\://learn.microsoft.com/dotnet/api/system.double)): Right hand side double to use to compute componentwise addition.

### Returns

| Type                                                                        | Description                                     |
| --------------------------------------------------------------------------- | ----------------------------------------------- |
| [double3x3](/engine/6000.6/script-reference/unity/mathematics/double3x3.md) | double3x3 result of the componentwise addition. |

## operator +(double, double3x3)

Returns the result of a componentwise addition operation on a double value and a double3x3 matrix.

```csharp
public static double3x3 operator +(double lhs, double3x3 rhs)
```

### Parameters

**** (\[double]\(https\://learn.microsoft.com/dotnet/api/system.double)): Left hand side double to use to compute componentwise addition.**** (\[double3x3]\(/engine/6000.6/script-reference/unity/mathematics/double3x3)): Right hand side double3x3 to use to compute componentwise addition.

### Returns

| Type                                                                        | Description                                     |
| --------------------------------------------------------------------------- | ----------------------------------------------- |
| [double3x3](/engine/6000.6/script-reference/unity/mathematics/double3x3.md) | double3x3 result of the componentwise addition. |