Feb-08-2019, 06:18 AM

Hello, I'm new here so I apologize if I mess up the protocol to some extent.

I am trying to write a program that takes 4 user inputs and plugs them into a formula. The last prompt to insert input asks if the user wants "flat cosmology" or "open cosmology" (represented by entering a 1 or 0 respectively). For some reason, regardless if I enter 1 or zero, it gives the value for if 0 is chosen. I will paste the code here:

If I remove the (d2), if, and else statements altogether, it gives the correct value for

cs == 1.

If anyone can help me figure out what's going on here, I would greatly appreciate it.

Thank you very much!

Kameron

I am trying to write a program that takes 4 user inputs and plugs them into a formula. The last prompt to insert input asks if the user wants "flat cosmology" or "open cosmology" (represented by entering a 1 or 0 respectively). For some reason, regardless if I enter 1 or zero, it gives the value for if 0 is chosen. I will paste the code here:

import math h = float(input("What is the value of H0 (in km/s/Mpc)?")) z = float(input("What is the value of z?")) j = float(input("what is the value of the matter density parameter?")) cs = input("Do you want a flat or open cosmology (1 = flat, 0 = open)?") def eta(a, omega): s = ((1- omega)/omega)**(1/3) return 2*math.sqrt(s**3 + 1)*(1/(a**4) - 0.01540*s/(a**3) + 0.4304*(s**2)/(a**2)\ + 0.19097*(s**3)/a +0.066942*s**4)**(-1/8) c = 3e8 q = (j/2) d1 = (1/(1 + z))*(c/h)*(eta(1, j) - eta(1/(1 +z), j)) d1 = d1*(math.pi/180)*(1/3600) d2 = (c/(h*q**2))*(((z*q) + (q - 1)*(math.sqrt(2*z*q + 1) - 1))/((1 + z)**2)) d2 = d2*(math.pi/180)*(1/3600) if cs == 1: print(d1) else: print(d2)so, it will only print (d2) no matter what I enter into the last prompt, and I'm not sure why. I'm running this on the debian distribution of Linux.

If I remove the (d2), if, and else statements altogether, it gives the correct value for

cs == 1.

If anyone can help me figure out what's going on here, I would greatly appreciate it.

Thank you very much!

Kameron