From 69b88a98a8d40e064993b316a36573e3a0ac0666 Mon Sep 17 00:00:00 2001
From: Aaron LI <aaronly.me@gmail.com>
Date: Sat, 28 May 2016 09:55:23 +0800
Subject: Move tools/cosmo_calc to another repo 'atoolbox'

---
 tools/cosmo_calc/calc_distance.cc | 140 --------------------------------------
 1 file changed, 140 deletions(-)
 delete mode 100644 tools/cosmo_calc/calc_distance.cc

(limited to 'tools/cosmo_calc/calc_distance.cc')

diff --git a/tools/cosmo_calc/calc_distance.cc b/tools/cosmo_calc/calc_distance.cc
deleted file mode 100644
index 4c96dc8..0000000
--- a/tools/cosmo_calc/calc_distance.cc
+++ /dev/null
@@ -1,140 +0,0 @@
-// calc_distance.cc
-// calculate commonly used cosmology distances
-// Ref: https://en.wikipedia.org/wiki/Distance_measures_(cosmology)
-//
-// Junhua Gu
-//
-// ChangeLogs:
-// 2012/08/12, LIweitiaNux
-//   fix a bug in `calc_angular_distance()'
-//   add `calc_transcomv_distance()' and
-//     account `omega_k >0, <0' cases
-//   add `calc_ligtrav_distance()'
-//
-
-#include <iostream>
-#include <cmath>
-#include <cstdlib>
-#include <cstddef>
-#include <cassert>
-// integrator
-#include "adapt_trapezoid.h"
-
-// extern variables in `calc_distance.h'
-extern double c;
-extern double km;
-extern double s;
-extern double Mpc;
-// cosmology parameters
-extern double H0;       // units: [km/s/Mpc]
-extern double omega_m;
-extern double omega_l;
-extern double omega_k;
-// precision to determine float number equality
-extern double eps;
-
-using namespace std;
-
-// auxiliary functions
-// for `calc_comoving_distance'
-double f_comvdist(double z);
-// for `calc_ligtrav_distance'
-double f_ligdist(double z);
-double f_age(double z);
-
-/////////////////////////////////////////////////
-// main functions
-// //////////////////////////////////////////////
-// dimensionless Hubble parameter
-double E(double z)
-{
-    return sqrt(omega_m*(1+z)*(1+z)*(1+z) + omega_k*(1+z)*(1+z) + omega_l);
-}
-
-// Hubble distance
-double calc_hubble_distance(void)
-{
-    //
-    // cerr << "*** H0 = " << H0 << " ***" << endl;
-    //
-    double _H0_ = H0 * km/s/Mpc;
-    return c / _H0_;
-}
-
-// calc `comoving distance'
-double calc_comoving_distance(double z)
-{
-    double d_H = calc_hubble_distance();
-    return d_H * adapt_trapezoid(f_comvdist, 0.0, z, 1e-4);
-}
-
-// calc `transverse comoving distance'
-double calc_transcomv_distance(double z)
-{
-    if (fabs(omega_k) <= eps) {
-        // omega_k = 0
-        // flat, d_M(z) = d_C(z)
-        return calc_comoving_distance(z);
-    }
-    else if (omega_k > 0.0) {
-        // omega_k > 0
-        // d_M(z) = d_H/sqrt(omega_k) * sinh(sqrt(omega_k) * d_C(z) / d_H)
-        //                   ^             ^
-        double d_H = calc_hubble_distance();
-        double d_C = calc_comoving_distance(z);
-        return (d_H / sqrt(omega_k) * sinh(sqrt(omega_k) * d_C / d_H));
-    }
-    else {
-        // omega_k < 0
-        // d_M(z) = d_H/sqrt(-omega_k) * sin(sqrt(-omega_k) * d_C(z) / d_H)
-        //                   ^             ^      ^
-        double d_H = calc_hubble_distance();
-        double d_C = calc_comoving_distance(z);
-        return (d_H / sqrt(-omega_k) * sin(sqrt(-omega_k) * d_C / d_H));
-    }
-}
-
-// calc `angular diameter distance'
-// d_A(z) = d_M(z)/(1+z)
-double calc_angdia_distance(double z)
-{
-  return (calc_transcomv_distance(z) / (1+z));
-}
-
-// calc `luminoisity distance'
-// d_L(z) = (1+z)*d_M(z)
-double calc_luminosity_distance(double z)
-{
-  return (calc_transcomv_distance(z) * (1+z));
-}
-
-// calc `light-travel distance'
-// d_T(z) = d_H \int_0^z 1/((1+z)*E(z)) dz
-double calc_ligtrav_distance(double z)
-{
-    double d_H = calc_hubble_distance();
-    return d_H * adapt_trapezoid(f_ligdist, 0.0, z, 1e-4);
-}
-
-
-// auxiliary functions
-// for `calc_comoving_distance'
-double f_comvdist(double z)
-{
-    return 1.0/E(z);
-}
-
-// for `calc_ligtrav_distance'
-double f_ligdist(double z)
-{
-    return 1.0 / ((1+z)*E(z));
-}
-
-double f_age(double z)
-{
-    return f_comvdist(1.0/z) / (z*z);
-}
-
-
-// EOF
-/* vim: set ts=8 sw=4 tw=0 fenc=utf-8 ft=cpp: */
-- 
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