**CIGAL Reference Manual, Chapter 6 (RealTime): r_vecadd**
===== r_vecadd -- Add (or subtract) vector variables =====
**usage:   r_vecadd   opflg eflag ltime    Vec1 Vec2 NewVec Flag**

R_VECADD is a REALTIME operator that adds values to 2-D or 3-D vector VEC1.

VEC2 can be another vector (same dimension as VEC1), or it can be a scalar value.
If it is a scalar (single value) then it will be added to every element of VEC1.

NEWVEC is the output vector; it must be the same dimension as VEC1.\\
If NEWVEC is not specified, the new values will be stored in VEC1.

  FLAG: 0 - default
        2 - 2-D vectors (default)
        3 - 3-D vectors
        4 - subtract VEC2 from VEC1 (instead of adding)
        8 - just use 1 value from VEC2 (scalar addition)

**See Also:**\\
[[jvs:cigal:manual:chapter6:r_vecmult|R_VECMULT]]

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