- matrix matrix                           create identity matrix

- initmatrix -                            set CTM to device default

matrix identmatrix matrix                 fill  matrix with identity transform

matrix defaultmatrix matrix               fill matrix with device default
                                          matrix

matrix currentmatrix matrix               fill matrix with CTM

matrix setmatrix -                        replace CTM by matrix

tx ty translate -                         translate user space by (tx, ty)

tx ty matrix translate matrix             define translation by (tx, ty)

sx sy scale -                             scale user space by sx and sy

sx sy matrix scale matrix                 define scaling by sx and sy

angle rotate -                            rotate user space by angle degrees

angle matrix rotate matrix                define rotation by angle degrees

matrix concat -                           replace CTM by matrix * CTM

matr1 matr2 matr3 concatmatrix matr3      fill matr3 with matr1 * matr2

x y transform x' y'                       transform (x, y) by CTM

x y matrix transform x' y'                transform (x, y) by matrix

dx dy dtransform dx' dy'                  transform distance (dx,dy) by CTM

dx dy matrix dtransform dx' dy'           transform distance (dx,dy) by matrix

x' y' itransform x y                      inverse transform (x',y') by CTM

x, y, matrix itranform x y                inverse tranform (x',y') by matrix

dx, dy, idtransform dx dy                 inverse transform distance (dx', dy')
                                          by CTM

dx, dy, matrix idtransform dx dy          inverse transform distance
                                          (dx', dy') by matrix
matrix1 matrix2 invertmatrix matrix2      fill matrix2 with inverse
                                          of matrix1