Subtracts the specified vector from this vector and returns the result. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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| Visual Basic | 
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| Visual C++ | 
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Parameters
- source
-  Type:  Autodesk.Revit.DB XYZ  
 The vector to subtract from this vector.
Return Value
The vector equal to the difference between the two vectors.Remarks
 The subtracted vector is obtained by subtracting each coordinate of the specified vector from the corresponding coordinate of this vector. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | Thrown when source is a null reference ( Nothing in Visual Basic) . |