  In this paper, we estimate the errors of Gaussian transformations implemented
using one-way quantum computations on cluster states of various configurations.
From all possible cluster state configurations, we choose those that give the
smallest computation error. Furthermore, we evaluate errors in hybrid
computational schemes, in which Gaussian operations are performed using one-way
computations with additional linear transformations. As a result, we find the
optimal strategy for the implementation of universal Gaussian computations with
minimal errors.
