doc: clarify handling of negative unknowns and parameters

[piplib.git] / test / test4.dat

((variables : a b c d ...., pas de parametres)
 4 0 4 0 -1 0
 (#[1 0 0 0 -2]
  #[1 2 0 0 -3]
  #[1 2 3 0 -7]
  #[1 2 3 4 -25]
 )
 ()
)