This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)


gives the matrix that represents reflection of points in a mirror normal to the vector v.
  • The reflection is in a mirror that goes through the origin.
  • ReflectionMatrix works in any number of dimensions. In 2D it reflects in a line; in 3D in a plane.
New in 6