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 1d revised Finding $P(X < Y)$ where $X$ and $Y$ are independent uniform random variables added 1 character in body 1d answered Finding $P(X < Y)$ where $X$ and $Y$ are independent uniform random variables Jul19 comment Issues with finite-difference implicit solution of Advection-Diffusion-Reaction eqn Sadly, I can't run your code (even though numpy is installed) due to TypeError: gradient() got an unexpected keyword argument 'edge_order' . Jul19 comment Issues with finite-difference implicit solution of Advection-Diffusion-Reaction eqn I can't access your code, but I requested authorization. It would be nice to see how you discretized $\partial_t u$ and $\nabla u$ and $\Delta u$. Jul19 comment Issues with finite-difference implicit solution of Advection-Diffusion-Reaction eqn Do you use Upwind for your advection term? Jul8 comment Is there any method that convert a concave problem into convex problem? Hey Tina, I edited your question, maybe you could make sure that the form of $f_2$ is still correct. Jul8 revised Is there any method that convert a concave problem into convex problem? Latex introduced Jul7 comment Help with greens function/fourier transformation to solve screened poisson equation That would be perfekt, my problem however is actually related to the fractional situation where I have $k^\alpha+\lambda^2$, but I would like to understand the integer case first. Thanks Jul7 comment Help with greens function/fourier transformation to solve screened poisson equation I know, that this answer is more than 2 years old, but do you happen to know the steps taken from the second last equation to the last equation? Wikipedia states that this can be done by Contour Integratiion, but I fail to see how. Jun23 accepted Derive diffusion coefficient for heat equation from random walk simulation Jun23 comment Derive diffusion coefficient for heat equation from random walk simulation Okay the problem in fitting the gaussian to my computed density was in the fact, that my cells over which I counted the number of particles where not of unit size, so my solution was rescaled. Fixing this also gave me your suggested diffusion coefficient of $\sigma/2)$. Jun23 comment Derive diffusion coefficient for heat equation from random walk simulation In my code, I don't really invoke $\Delta t$. Timesteps correspond to loop iterations. I will update my question with the least square fitting which looks like I'm still doing something wrong Jun23 comment Derive diffusion coefficient for heat equation from random walk simulation And I would use unit time, i.e. $T=$Number of Time steps? Jun23 comment Derive diffusion coefficient for heat equation from random walk simulation Thank you very much. I assume, $\sigma$=stdv. Can you verify, if the Green's function I assume is correct? Jun23 asked Derive diffusion coefficient for heat equation from random walk simulation Jun17 revised Mathematical formulation for equation in a loop added 79 characters in body Jun17 comment Mathematical formulation for equation in a loop Yeah, I'm sorry for the confusing notation with the indices. Of course for $g$ and $f$ the superscript denotes the $i$th or $k$th $f$ and $g$, respectively. For $\alpha$, the superscript denotes the power. I will edit the answer and replace the superscripts for $f$ and $g$ by subscripts. Jun17 answered Mathematical formulation for equation in a loop Jun17 comment Mathematical formulation for equation in a loop You give a way to compute $f^i=\alpha...$ but not for $g^i$, that is what would help. Jun17 comment what are stability analysis of numerical methods You definitely have to reformulate your answer. Provide more details and put in some effort and people will be glad to help you.