def delta_to_Sigma(delta,zrange,cosmo=None):
Sigma = delta.copy()
assert len(zrange) == delta.Nz
if cosmo is None: cosmo = Cosmology()
zrange = list(zrange) + [0.0]
for i in range(Sigma.Nz):
lp = Sigma.lens_plane(i)
z = zrange[i]
#lp += 1
lp *= cosmo.H0**2 * cosmo.Om * cosmo.rho_crit(z)*(1.+z)**3 \
/cosmo.H(z)**2
#now we're in g/cm^3
lp *= Mpc_cm**3 / Msun_g
#multiply by size of bin to get surface density
lp *= ( cosmo.Dc(zrange[i]) - cosmo.Dc(zrange[i-1]) )
return Sigma
def Sigma_to_delta(Sigma,zrange,cosmo=None):
delta = Sigma.copy()
assert len(zrange) == Sigma.Nz
if cosmo is None: cosmo = Cosmology(Or=0.0)
zrange = list(zrange) + [0.0]
for i in range(delta.Nz):
lp = delta.lens_plane(i)
z = zrange[i]
#divide by bin size to turn surface density into 3D density
lp /= ( cosmo.Dc(zrange[i]) - cosmo.Dc(zrange[i-1]) )
#convert to g/cm^3
lp *= Msun_g / Mpc_cm**3
lp /= cosmo.H0**2 * cosmo.Om * cosmo.rho_crit(z)*(1.+z)**3 \
/cosmo.H(z)**2
#i = numpy.where(lp.real>0)
#lp[i] -= 1
return delta
