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7,658 questions
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Computing any element of null space of singular matrix

Given a singular matrix $A$. What is the fastest method for finding a single non-zero solution to $Ax=0$. Note that we are NOT looking to find the whole kernel, we just want any non-zero vector in it. ...
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Time sampling changes solution

I'm currently trying to solve a problem using numerical methods. The set-up is rather long, so I apologize in advance... TL;DR: My solutions change depending on how big my steps are and I don't know ...
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Computational Biology [on hold]

Can people in SIS model can also be removed or die if the infection is fatal ? Consider a disease ’X’. People who are diagnosed in the earlier stage have high chance of recovery. But the intense ...
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state of art resources for transportation logistics

By transportation logistics, I mean the application of theoretical tools like traveling salesman problem, routing problem etc. So what are these applications? Well, stuff like how to schedule a fleet ...
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How to start using python scripting in automotive power train? [on hold]

Looking for the basic things like what we can do with python in automotive.
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How to efficently plot a finite element mesh solution with matplotlib

I am looking for the most efficient way to plot a mesh using matplotlib given the following information, coordinates of each node, what nodes belong to each element, and the value each node has. Below ...
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Simplest way to precondition Uzawa iteration

I have a diffusion problem with an internal circular dirichlet constraint and a side condition which shall enforce a certain global volume integral. $\nabla(D \nabla u(x)) = 0$ outer boundary ...
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How to obtain linear tridiagonal system from PDE

I'm trying to re-solve the governing equations in hydraulic fracturing modeling as instructed step by step in a paper. After (A-9), the author stated that by substituting A-6, A-8 and A-9 into ...
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