diagonalMatrix(Matrix) -- make a diagonal matrix from entries of a matrix

• Function: diagonalMatrix

• Usage:

  diagonalMatrix m

• Inputs:
  • m, a matrix
• Outputs:
  • a matrix, a diagonal matrix whose diagonal entries are the entries of m

i1 : R = QQ[a..d];

i2 : diagonalMatrix vars R

o2 = | a 0 0 0 |
     | 0 b 0 0 |
     | 0 0 c 0 |
     | 0 0 0 d |

             4      4
o2 : Matrix R  <-- R

i3 : diagonalMatrix matrix{{0,2},{4,6}}

o3 = | 0 0 0 0 |
     | 0 4 0 0 |
     | 0 0 2 0 |
     | 0 0 0 6 |

              4       4
o3 : Matrix ZZ  <-- ZZ