density = startDensity
deltaDensity = totalDeltaDensity
decayFactor = 2.5
deltaDensity = 0.01
print "start approaching target density", targetDensity
while density < targetDensity:
#deltaDensity /= decayFactor
density += deltaDensity
print "current density", density
solver.setVolumeDensity(density)
solver.solve()
g = solver.getRDF()
solver.setStartValue(g)
#Direct calculation
print "Directly calculating RDF for target density", targetDensity
solver.setStartValue(np.zeros(solver.getNumberOfRadialSamplingPoints()) )
solver.setVolumeDensity(targetDensity)
solver.solve()
g_direct = solver.getRDF()
#Plot results
r = np.arange(solver.getNumberOfRadialSamplingPoints() ).astype('float') + 1.0
r *= solver.getDelta_r()/solver.getHardSphereRadius()
pl.plot(r, g, label = 'RDF obtained by iterating over densities' );
pl.plot(r, g_direct, label = 'RDF obtained directly' );
