  A simple algorithm is proposed for studies of structural and elastic
properties in the presence of structural disorder at zero temperature. The
algorithm is used to determine the properties of the polydisperse soft disc
system. It is shown that the Poisson's ratio of the system essentially depends
on the size polydispersity parameter - larger polydispersity implies larger
Poisson's ratio. In the presence of any size polidispersity the Poisson's ratio
increases also when the interactions between the particles tend to the hard
potential.
