matrix(LineageTable) -- extract a matrix of polynomials from values of a LineageTable after deleting null values

• Function: matrix

• Usage:

  matrix LineageTable

• Inputs:
  • H, an instance of the type LineageTable, whose values are polynomials
• Optional inputs:
  • Degree => ..., default value null,
• Outputs:
  • a matrix, of non-null values of H

i1 : R = ZZ/101[a,b,c];

i2 : allowableThreads= 2;

i3 : T = reduce tgb( ideal "abc+c2,ab2-b3c+ac,b2")

                                  2
o3 = LineageTable{((1, 2), 0) => c }
                  (0, 1) => null
                  (0, 2) => null
                  (1, 2) => a*c
                  0 => null
                  1 => null
                        2
                  2 => b

o3 : LineageTable

i4 : matrix T

o4 = | b2 c2 ac |

             1      3
o4 : Matrix R  <-- R