Diffusion Monte Carlo(DMC) Calculations of simple harmonic oscillator(SHO) system.
GF means the guide function is used to make the calculation more efficient.（See J.M.Thijssen, "Computation Physics", Cambridge pressed.）
This program is written in Fortran90 to calculate the ground state energy of SHO system. For N dimensional case, the ground state energy should be 0.5*N, with mass = omega = 1.0.
To use this code, just simply type as follows:
ifort filename.f90
./a.out
The results of energy will be printed on the screen and written in file 'SHO_DMC_(GF_)results.log', while the data of wave function will be written in file 'SHO_DMC_wavefunction.log'.