ncMatrixMult -- Correctly multiplies matrices from noncommutative rings.

Synopsis

• Usage:

  L = ncMatrixMult(M,N)

• Inputs:
  • M, a matrix,
  • N, a matrix,
• Outputs:
  • L, a matrix,

Description

i1 : A = QQ<|x,y|>

o1 = A

o1 : FreeAlgebra

i2 : M = matrix {{x}}

o2 = | x |

             1       1
o2 : Matrix A  <--- A

i3 : N = matrix {{y}}

o3 = | y |

             1       1
o3 : Matrix A  <--- A

i4 : M*N

o4 = | yx |

             1       1
o4 : Matrix A  <--- A

i5 : assert(ncMatrixMult(M,N) == matrix {{x*y}})