oneEntry -- builds a one-by-one matrix

Synopsis

• Usage:

  oneEntry(row,col,ent)

• Inputs:
  • ent, a ring element, drawn from some ring R
  • row, a list, a degree for the ring R
  • col, a list, a degree for the ring R
• Outputs:
  • a matrix, a single-entry matrix with row degree row, column degree col, and entry ent

Description

i1 : R = QQ[x]

o1 = R

o1 : PolynomialRing

i2 : oneEntry({3},{5},x^2)

o2 = {3} | x2 |

             1       1
o2 : Matrix R  <--- R

i3 : oneEntry(,{5},x^2)

o3 = {3} | x2 |

             1       1
o3 : Matrix R  <--- R

i4 : oneEntry({3},,x^2)

o4 = {3} | x2 |

             1       1
o4 : Matrix R  <--- R

i5 : S = QQ[y,Degrees=>{{4,-5}}]

o5 = S

o5 : PolynomialRing

i6 : oneEntry(3,,y)

o6 = {12, -15} | y |

             1       1
o6 : Matrix S  <--- S

Caveat