  On the basis of a proposed model of wave function collapse, we investigate
spontaneous localization of a quantum state. The model is similar to the
Ghirardi-Rimini-Weber model, while we postulate the localization functions to
depend on the quantum state to suffer collapse. According to the model, dual
dynamics in quantum mechanics, deterministic and stochastic time evolution, are
algorithmically implemented in tandem. After discussing the physical
implications of the model qualitatively, we present numerical results for
one-dimensional systems by way of example.
