- NCMatrix -- Negates NCMatrices

i1 : A = QQ{x,y,z}

o1 = A

o1 : NCPolynomialRing

i2 : M = ncMatrix {{x, y, z}}

o2 = | x y z |

o2 : NCMatrix

i3 : sigma = ncMap(A,A,{y,z,x})

o3 = NCRingMap A <--- A

o3 : NCRingMap

i4 : N = ncMatrix {{M},{sigma M}, {sigma sigma M}}

o4 = | x y z |
     | y z x |
     | z x y |

o4 : NCMatrix

i5 : -N

o5 = | -x -y -z |
     | -y -z -x |
     | -z -x -y |

o5 : NCMatrix