# All Questions

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### Alternatives to Comsol Multiphysics

This might be a question better suited for the Software Recommendations side of S.E., however I do believe that people who frequent this part of S.E. are more likely to be able to answer this ...
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### Lanczos with thick restart

I have been trying to write code for the Lanczos method using a thick restarting scheme as described in this paper. I am getting just ok results for the largest eigenvalues and horrible results when ...
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### private register variable | OpenMP [on hold]

Consider, register int a; Does program allocate private register variables to each thread at the clause, ...
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### What are the tradeoffs of using statically allocated arrays vs. pointers and dynamic allocation? [on hold]

I am learning Monte Carlo simulation by C++. I begin with reading codes (from the internet and text books) of the 2D Ising model and the XY model. I find some people define spins simply by a two ...
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### FEM for a nonlinear parabolic PDE

I'm looking to numerically compute the solution to $$k(x,u) \partial_t u - \Delta u = f \quad\quad\text{ in } \Omega \times [0,T]$$ where $k$ is a continuous but nonlinear (in $u$) real-valued ...
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### Tetrahedron Mesh file format

Ply file formats is used to represent mesh structures.I was referring to the example meshes all of which represent ...
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### Speeding up the classical Jacobi method using Scheduled Relaxation method? [on hold]

There has been quite a flutter recently in the iterative world about an algorithm that speeds up the classical Jacobi method by as much as 200 times using a scheduled relaxation method where a ...
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### ARPACK gives different answers from Matlab and NAG

I'm playing with ARPACK. I looked into the examples they provide, zndrv4.f illustrating the usage of the routine znaupd, in the directory of ARPACK/EXAMPLES/COMPLEX/. I also came cross NAG Fortran ...