# All Questions

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### Stationary solution converge but time dependent doesn't

I've coupled a COMSOL model for fluid dynamics with a very simple pde that model the transport of humidity in air. When I solve it for the stationary case, the solution converge easily, but when I ...
32 views

374 views

### How to move particles in a variational Monte Carlo simulation?

I'm attempting to implement some code that moves particles and then calculated the acceptance/rejection of the move, but I'm stuck in a rut. Here is my Python code: ...
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### Produce equation of curve, given some coordinates [duplicate]

Possible Duplicate: Get equation for a curve which intersects x at seemingly randomly distributed points? I tried asking something similar to this before, but I guess I didn't explain very well. ...
164 views

### Permissive Math Library for Parameter Statistics in C++

I am looking for recommendations for a C++ math library, with a permissive licence, well suited to calculating a wide variety of statistics on segmentations of timebased parameter data. I would be ...
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### Shooting Method- Boundary value problem starting from -1 to 1

The equation is $\rho \frac{d \bar{u}}{dy} = -\frac{d\bar{p}}{dx} + \mu\frac{d^2\bar{u}}{dy^2}$ with boundary condition $u(-1)=0$ and $u(1)=1$ I am to solve it using fifth order runge-kutta ...
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### Newbie help on FEM contact problem

I am modelling the time-evolution of a soft material with a tetrahedral mesh. I use an FEM method to compute the forces on each node, and then numerically integrate the positions and velocity of the ...
1k views

### Faster code for double integration using Gauss-Legendre quadrature

I came with a the following code to evaluate a double integral using Gauss Legendre quadrature in MatLab ...
33 views

### Generating pseudorandom sequences based on measured sequences

I'm looking for an algorithm to generate discrete-time pseudorandom sequences based on other sequences I already have that would be used to train the algorithm. More specifically, I have some time-...
229 views

### Applying Runge-Kutta to nonlinear system of PDEs

I am applying a 4th order Runge-Kutta code, using the method of lines, to solve the following: $$\frac {\partial y_1}{\partial t} = y_2 y_3 - C_1 y_1$$ \...
233 views

2k views

### optimization non linear problem with java code

Is there some packages in java that can be included to eclipse in order to solve a non linear problem? I have used ipopt but when running, there is a notification which say "NOTE: You are using Ipopt ...
111 views

### RK4 for stiff IVP

I need a solver of stiff Inital-Value Problems (IVP) in python exploiting RK4 preferably explicit. I have been searching for past few days but could not find it. Following are my queries: Does the ...
535 views

### Pde problem with robin boundary condition

I have my pde 2D problem with robin condition (form: du/dn +ku=g) to solve with matlab. i have the exact function u and I want to find the function g in robin condition. How can i do it? thanks for ...