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Macaulay2Doc :: random(Type)

random(Type) -- random element of a type

Synopsis

Description

Synopsis

  • Usage:
    random T
  • Inputs:
  • Outputs:
    • a random instance of the type T. If the Height option specifies a number h and T is ZZ and , then the integers returned are in the range 0 .. h-1; for QQ the numerator and denominator are in the range 1 .. h.
i1 : random RR

o1 = .83565235244963

o1 : RR (of precision 53)
i2 : random CC_100

o2 = .993874274005081354731389036848+.794828137048123517020860939712*ii

o2 : CC (of precision 100)
i3 : tally for i to 100 list random GF 11

o3 = Tally{-1 => 1}
           -1 => 1
           -1 => 1
           -1 => 1
           -1 => 1
           -2 => 1
           -2 => 1
           -2 => 1
           -2 => 1
           -2 => 1
           -2 => 1
           -2 => 1
           -2 => 1
           -2 => 1
           -2 => 1
           -2 => 1
           -2 => 1
           -3 => 1
           -3 => 1
           -3 => 1
           -3 => 1
           -3 => 1
           -3 => 1
           -3 => 1
           -3 => 1
           -3 => 1
           -3 => 1
           -3 => 1
           -4 => 1
           -4 => 1
           -4 => 1
           -4 => 1
           -4 => 1
           -4 => 1
           -4 => 1
           -4 => 1
           -4 => 1
           -4 => 1
           -4 => 1
           -5 => 1
           -5 => 1
           -5 => 1
           -5 => 1
           -5 => 1
           -5 => 1
           0 => 1
           0 => 1
           0 => 1
           0 => 1
           0 => 1
           0 => 1
           0 => 1
           0 => 1
           1 => 1
           1 => 1
           1 => 1
           1 => 1
           1 => 1
           1 => 1
           1 => 1
           1 => 1
           1 => 1
           1 => 1
           1 => 1
           1 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           2 => 1
           3 => 1
           3 => 1
           3 => 1
           3 => 1
           4 => 1
           4 => 1
           4 => 1
           4 => 1
           4 => 1
           4 => 1
           4 => 1
           4 => 1
           4 => 1
           4 => 1
           4 => 1
           5 => 1
           5 => 1
           5 => 1
           5 => 1

o3 : Tally
i4 : random GF(2,40)

      38    35    33    32    31    30    28    27    26    25    22    21  
o4 = a   + a   + a   + a   + a   + a   + a   + a   + a   + a   + a   + a   +
     ------------------------------------------------------------------------
      20    18    17    15    13    12    11    8    7    6    5    2
     a   + a   + a   + a   + a   + a   + a   + a  + a  + a  + a  + a  + a

o4 : GF 1099511627776

Synopsis

  • Usage:
    random(d,R)
  • Inputs:
  • Outputs:
    • a random homogeneous element of the ring R of degree d
i5 : R = ZZ[x,y];
i6 : random(5,R)

       5     4      3 2     2 3    5
o6 = 3x  + 6x y + 7x y  + 9x y  + y

o6 : R
i7 : R = GF(25,Variable=>a)[x,y];
i8 : VerticalList for i to 6 list random(3,R)

     { 3             2                2              3}
o8 = {x  + (- a + 1)x y + (- a - 2)x*y  + (- 2a - 2)y }
     {        3              2       2             3  }
     {(a + 1)x  + (- 2a + 2)x y + x*y  + (- a + 2)y   }
     {          3    2              2            3    }
     {(- a + 1)x  - x y + (a - 2)x*y  + (2a + 2)y     }
     {   3     2       2      3                       }
     {- x  - 2x y + x*y  - a*y                        }
     {   3            2               2            3  }
     {a*x  + (2a + 1)x y + (2a - 2)x*y  + (2a + 1)y   }
     {          3           2                2    3   }
     {(- a + 1)x  + (a - 2)x y + (- a + 1)x*y  - y    }
     {   3           2                2      3        }
     {a*x  + (a + 2)x y + (- a - 1)x*y  - a*y         }

o8 : VerticalList
The length of d, if it's a list, should be the same as degreeLength R.

See also