Stellar Astrophysics code
This java application utilizes the Runge-Kutta fourth order numerical method to solve the Lane-Emden equation.
Packaged application: Polytrope.jar
Input Parameters:
- Number of iterations (required)
- Iteration step size (required)
- Polytropic index (required)
- Output data file path (optional) NOTE: file is comma delimited with a header
- Output file data skip value (optional) NOTE: this value will output only the total number entered here. All iterations are still calculated.
Usage:
"java -jar Polytrope.jar 70000 0.0001 3.0 c:/astro/data/polytropicindex3.csv 1500"
(in this example there are 70000 iterations are calculated for a polytropic index of 3.0 but only ~1500 of those values will be output to the data file located at the desired path. If the 1500 is removed then all 70000 will be output.)
Notes:
https://stackoverflow.com/questions/7539/use-of-java-math-mathcontext/7561