  # GeometryTransformerAddLanguageSpecificTextSet("LST9B66EDCB_0?cpp=::|nu=.");AdvancedAddLanguageSpecificTextSet("LST9B66EDCB_1?cpp=::|nu=.");ObserveVectorInOtherVectorsAxes Method (Vector, Vector, EvaluatorGroup)

Gets an evaluator to observe the Motion<Cartesian> of a vector in the axes in which another vector is defined. Note that this will not account for any translational effects and the axes are considered to be the vector's basis. So if the vector is representing a velocity or boresight vector, observing the vector in the axes of a reference frame which is rotating and translating with respect to the vector's axes will only take into account the relative rotation as if the two basis axes were colocated when computing the vector's derivatives. To obtain a vector and its derivatives in a different frame, the vector needs to be created in that frame.

Namespace:  AGI.Foundation.Geometry
Assembly:  AGI.Foundation.Core (in AGI.Foundation.Core.dll) Version: 19.3.400.0 (19.3.400.0) Syntax
```public static VectorEvaluator ObserveVectorInOtherVectorsAxes(
Vector vectorToObserve,
Vector axesOwner,
EvaluatorGroup group
)```

#### Parameters

vectorToObserve
Type: AGI.Foundation.GeometryVector
The vector to observe.
axesOwner
Type: AGI.Foundation.GeometryVector
The vector is observed in the axes in which this vector is defined.
group
Type: AGI.FoundationEvaluatorGroup
The group with which to associate the new evaluator. By grouping evaluators that are often evaluated at the same Julian dates, common computations can be performed only once for the entire group instead of multiple times for each evaluator.

#### Return Value

Type: VectorEvaluator
An evaluator to find the motion of a vector in another vector's axes. Exceptions
ExceptionCondition
ArgumentNullException Thrown when vectorToObserve, axesOwner, or group is . See Also