Code for verlet frog leap method.

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In summary, the conversation is about searching for a C code for the verlet leap method, also known as the leapfrog method, which updates the system of particles with acceleration, velocities, and displacements. The individual asks if anyone knows where to find such a code, and someone suggests searching for "Yoshida integrator" for higher order versions. The conversation also mentions a useful link with pseudocode and additional information, and someone asks if it is not available in Numerical Recipes. Another individual suggests looking at user-supplied codes for Matlab and translating it into C. The staggered leapfrog method is also mentioned and described in Numerical Recipes in C.
  • #1
MathematicalPhysicist
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im searching for a C code for verlet leap method, i.e a one the advances the system of particles with accleration,velocities,displacements.

anyone knows where may i find such a code?

thanks in advance.
 
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  • #2
too lazy to code yourself?
 
  • #3
neurocomp2003 said:
too lazy to code yourself?

Now, now, take it easy. I'd love to help, but I have no idea of what a verlet leap method is. Anyone? :blushing:
 
  • #4
its known also plainly as the leapfrog method which gives more hits for a search than verlet.

Basically you have some timestep dt...each halfstep you update v and each fullstep you update x. (you might also beable to update v each fullstep).

t=0 => initial cfg
t+0.5dt=> update v
t+1.0dt=> update x
t+1.5dt=> update v
etc.
 
  • #5
Useful link, with both the pseudocode and additional info:

http://artcompsci.org/kali/vol/two_body_problem_2/ch01.html

[edit]: More general versions ('higher order leapfrog') are also available. fourth-, sixth- and eighth-order leapfrog methods are available online, all of which are (naturally) symplectic. Do a search for 'Yoshida integrator', that should turn up some useful results.
 
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  • #6
neurocomp2003 said:
too lazy to code yourself?

i wish that were the case.
 
  • #8
didn't find anything there about leap frog method.
 
  • #9
Try looking at the user supplied codes for Matlab and then translate the code into C if someone has done it.
 
  • #10
The staggered leapfrog method is described in Numerical Recipes in C in chapter 19 (Partial Differential Equations) section 1 (Flux-Conservative Initial Value Problems) on the bottom half of page 842: http://www.nrbook.com/a/bookcpdf/c19-1.pdf
 

What is the Verlet Frog Leap Method?

The Verlet Frog Leap Method is a mathematical algorithm used in computer simulations to model the movement of particles or objects in a system. It is commonly used in physics and engineering simulations, particularly in the fields of molecular dynamics and structural mechanics.

How does the Verlet Frog Leap Method work?

The Verlet Frog Leap Method uses a numerical integration technique to calculate the position and velocity of particles at each time step in a simulation. It uses information from the previous time step to estimate the current position and velocity, and then uses this information to calculate the next time step. This process is repeated until the desired simulation time is reached.

Why is the Verlet Frog Leap Method useful?

The Verlet Frog Leap Method is useful because it is both accurate and efficient. It is a second-order method, meaning that it has a higher level of accuracy compared to first-order methods. It is also a symplectic method, meaning that it conserves energy in a system. Additionally, it does not require the calculation of derivatives, making it more computationally efficient than other methods.

What are the limitations of the Verlet Frog Leap Method?

While the Verlet Frog Leap Method is a commonly used algorithm, it does have some limitations. It is a deterministic method, meaning that it assumes that the particles in a system behave predictably. This may not always be the case in complex systems or systems with a large number of particles. Additionally, it may not be suitable for simulations involving strong forces or rapidly changing dynamics.

How is the Verlet Frog Leap Method different from other integration methods?

The Verlet Frog Leap Method differs from other integration methods in several ways. First, it is a symplectic method, which means that it conserves energy in a system. Other methods, such as the Euler method, do not have this property. Additionally, it does not require the calculation of derivatives, which makes it more computationally efficient. Finally, it is a second-order method, meaning that it has a higher level of accuracy compared to first-order methods.

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