Declaration: 
TVector.Leng: double; 
The property Leng can be used to both calculate the length of a vector and to set the length of a vector to a given value. Setting the length of a zerolength vector is ignored. Note, that setting the length of a vector to 1.0 is equal to normalizing this vector.

Example: 
The statement L := Vec1.Leng; calculates the length of the vector Vec1 and assigns it to the variable L.

