weight(RootSystem,BasicList) -- construct a weight from a list

Synopsis

• Function: weight

• Usage:

  weight(R,L)

• Inputs:
  • R, an instance of the type RootSystem,
  • L, a basic list, the coordinates of the weight
• Outputs:
  • an instance of the type Weight, a weight vector in a the weight lattice of R

Description

i1 : R=rootSystemB(3)

o1 = RootSystem{...8...}

o1 : RootSystem

i2 : weight(R,{1,2,1})

o2 = | 1 |
     | 2 |
     | 1 |

       3
o2 : ZZ