def write_helmholtz_volume(self, filename='helmholtz-volume.dat'):
    w = open(filename, 'w')
    for (i, (t, ep, fe)) in enumerate(zip(self._temperatures, self._equiv_parameters, self._free_energies)):
        if (i == self._len):
            break
        w.write(('# Temperature: %f\n' % t))
        w.write(('# Parameters: %f %f %f %f\n' % tuple(ep)))
        for (j, v) in enumerate(self._volumes):
            w.write(('%20.15f %25.15f\n' % (v, fe[j])))
        w.write('\n\n')
    w.close()
def write_helmholtz_volume(self, filename='helmholtz-volume.dat'):
    w = open(filename, 'w')
    for (i, (t, ep, fe)) in enumerate(zip(self._temperatures, self._equiv_parameters, self._free_energies)):
        if (i == self._len):
            break
        w.write(('# Temperature: %f\n' % t))
        w.write(('# Parameters: %f %f %f %f\n' % tuple(ep)))
        for (j, v) in enumerate(self._volumes):
            w.write(('%20.15f %25.15f\n' % (v, fe[j])))
        w.write('\n\n')
    w.close()