All Questions
11 questions
-1
votes
1
answer
739
views
How to write Bessel function using power series method in Python without Sympy?
I am studying Computational Physics with a lecturer who always ask me to write Python and Matlab code without using instant code (a library that gives me final answer without showing mathematical ...
- 51
2
votes
1
answer
2k
views
Is Gauss quadrature always a good option for know analytical functions?
What are the limitations of Gauss quadratures? I know that if I'm integrating, for example, a data set a Gauss quadrature won't be the best option, but if I know the function analytically is there any ...
- 21
0
votes
0
answers
336
views
Numerical solutions of unsteady 2D heat equation in python producing error incorrectly
I am trying to implement two numerical solutions. A forward Euler and a second order Runge-Kutta for the unsteady 2D heat equation with periodic boundary conditions. I am using a 3 point central ...
- 354
0
votes
2
answers
3k
views
How do I solve a 2nd order differential equation for projectile motion with air resistance?
the equation is:
d^2 r/dt^2 = -c/m (dr/dt)+g
where r is the position of the projectile, c is the drag coefficient, m is the mass of the projectile and g is the acceleration due to gravity.
Assuming ...
- 19
1
vote
1
answer
772
views
How to find the electric field from the potential?
That's my script to find a potentiel in a ionization room:
# Programme de résolution de l'équation de Laplace
# par la méthode de Gauss-seidel
# importation des librairies
import numpy as np
import ...
- 11
1
vote
2
answers
635
views
Estimate velocity on a spring by iterative approach
The problem:
Consider a system with a mass and a spring as shown in the picture below. The stiffness of the spring and the mass of the object are known. Therefore, if the spring is stretched the ...
- 13
0
votes
2
answers
4k
views
Angular spectrum method using python
I am trying to numerically propagate a given (electric) field using the angular spectrum method. For this I am following "Principles and Applications of Fourier Optics" (Robert K. Tyson) Chapter 3, ...
- 177
0
votes
0
answers
485
views
Vector Plot of Electric Field (Laplace's Equation)
I have solved Laplace's equation for a 2D square box analytically, and would like to plot the electric field vectors as a function of y and x. https://www.youtube.com/watch?v=ws3LIfWxfcM This is a ...
- 15
2
votes
1
answer
7k
views
solving 1D Schrödinger equation with Numerov method (python)
I'm currently trying to solve the 1D Schrödinger eq. (time independent) with the Numerov method. The derivation of the method is clear to me but I have some problems with the implementation. I tried ...
- 496
0
votes
3
answers
228
views
How to define a function in python that takes as an input mathematica function and it's argument and apply to it.
I want to define a function that takes arguments as a mathematical function , it's arguments, and number of iterations (I am looking for the zeros of the function with the fixpoint theorem).
I know ...
- 79
0
votes
2
answers
1k
views
Modifying C implementation of rk4 method
My problem is, frankly, that I'm unsure how this works.
I need to modify the double f() function to solve an arbitrary
differential equation d2θ/dt2 = −ω2sinθ, but as it is I am unsure how to proceed....
- 3