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cosmo_param
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cosmo_param(Omega_m,Omega_lambda,Omega_k,q0)
Same as IDL routine:
Given any two of the four input parameters
(1) the normalized matter density Omega_m
(2) the normalized cosmolgical constant, Omega_lambda
(3) the normalized curvature term, Omega_k
(4) the deceleration parameter q0
this program will derive the remaining two.
Here "normalized" means divided by the closure density
so that Omega_m + Omega_lambda + Omega_k = 1. For a more
precise definition see Caroll, Press, & Turner (1992, ArAA, 30, 499).
If less than two parameters are defined, this procedure sets default
values of Omega_k=0 (flat space), Omega_lambda = 0.7, Omega_m = 0.3
and q0 = -0.5 in these order (by avoiding parameter defined) until
two parameters are defined.
If more than two parameters are defined upon input (overspecification),
then the first two defined parameters in the ordered list Omega_m,
Omega_lambda, Omega_k, q0 are used to define the cosmology.
INPUTS-OUTPUTS:
Omega_m : Normalized matter energy density
non-negative numeric scalar
Omega_lambda: Normalized cosmological constant
numeric scalar
Omega_k : Normalized curvature parmeter
numeric scalar. This is zero
for a flat universe
q0 : Deceleration parameter
numeric scalar
= 0.5*Omega_m - Omega_lambda
interpreted function, defined at contrib/cosmo.i line 4
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