All Questions
Tagged with computational-physics software
30
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Covariant Euler-Lagrange Computation - Mathematica
Does anybody know of a software (or software package) that can solve the Euler-Lagrange equations for a manifestly-covariant field Lagrangian density? Mathematica has a "Variational Methods" ...
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1
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Issues with Simulating the Orbits of Mars and Earth using MATLAB and Runge-Kutta Method
I'm trying to simulate the orbits of Mars and Earth in MATLAB using the 4th order Runge-Kutta method for numerical integration. However, the orbits appear as straight lines rather than the expected ...
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1
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1 dimensional simulation of gravity fails
In 1D the force of gravity does not diminish with distance however here I use 1D to mean the point mass only moves in a line in 3D space, with the other mass stationary at the origin.
I started by ...
Qni
2
votes
1
answer
84
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Best approach to simulating dynamics on networks
I have been recently getting into the field of various processes on networks. For example, stochastic processes like percolation, Ising models, various statistical-physics models; or deterministic ...
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Issue in implementing a cloth simulation using verlet integration
I am trying to implement a cloth simulation in c++ using verlet integration and I'm getting some odd issues that I can't seem to explain, the points in the cloth seem to fly around and have weird ...
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Geant4, simulate photon emitted into lead
I have just learned Geant4 and recently I tried to simulate photons emitted into lead. After I collected the data and figured out the transmission of photons. I found my data is bigger than the ...
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4
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Euler integration of the three-body problem
Me and one of my colleague are trying to simulate the three-body problem with a C++ program in order to compare different integration schemes. At the moment we are trying to use the Euler's method, ...
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I need MATLAB or Mathematica code to solve this integral over limit 0- λ
I want the code to integrate equation(1) or (2) over the limits using mathematical or mathlab to get equation (3) as the answer of $Z$ vibrational partition function, giving the following additional ...
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How can I couple MCNP with FLUKA? To attain reactor dynamics and simulate an ADS experiment? (Under Subcritical fast system)
I'm new in Particle Physics based Computing. I want to simulate an ADS experiment (Accelerator Driven System) in subcritical fast system. I was advised to simulate the experiment with FLUKA with MCNP ...
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3
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90
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How can I plot a rainbow?
I'm trying to write a program that can simulate a rainbow. So far I've got figured out how to determine the change in the refractive index depending on the wavelength, the angular deviation of the ...
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Convoluted exponential gaussian probability function from Igor Pro
I am trying to figure out the exact formula for a three convoluted exponential gaussian probability function from the software Igor Pro, from my research. Unfortunately all I the closest equation from ...
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How to solve nonlinear second order ODE in Matlab? [duplicate]
I am working on simulating a car suspension system using Matlab.
Specifically, I have to derive equation of motion using the Lagrange method and then use ode 45 to solve it. However, while using ...
Luận Trần Công
2
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2
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1k
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Diagonalization using LAPACK
Say, we have a Hamiltonian which for simplicity does not mix particle hole sectors. It is just a simple Hamiltonian in real space as shown,
$H=\sum_{ij,\sigma} A(i,j)(c_{i\sigma}^{\dagger}c_{j\sigma} +...
- 23
1
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2
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304
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Numerical minimization of the action in python
I want to find the trajectory $x(t)$ which minimizes the action $S = \int_{t_i}^{t_f} L(x(t), \dot{x}(t)) \mathrm{d}t$ numerically.
I am trying to do it by discretizing the action so it is more of a ...
murt_
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3
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Draw magnetic field lines or vector field of a magnetic dipole - Python/Matplotlib
In the Wikipedia article on magnetic moments, subsection "Effects on environment" defines the magnetic field H of a magnetic dipole moment. Additionally the magnetic field lines of this ...
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