Top new questions this week:
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A MATLAB library seems to overcomplicate a computation:
exp( (log(a) - log(b))/b )
which is mathematically equivalent (assuming real & positive ...
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How frequently scientific code uses comparisons NaN == NaN?
Reason of asking: from time to time compilers / software floating-point library implementations have ...
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I am struggling with implementing an algorithm that does one simple thing:
Consider two polygons (one can just draw any two polygons and number their vertices), whose connectivities in a node list are:...
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I'm in search for a library for solving large systems of non-linear equations, similar to MINPACK, but unlike MINPACK, can accept a Jacobian in band-storage.
My Jacobian is sometimes not invertible, ...
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Following the advise of @Federico Polonion a previous post, one suggested, to find a basis of common eigen vectors between 2 matrices, to simply do :
Generate 2 ...
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In my research, I need to invert a Fisher matrix in order to get a covariance matrix for me to do parameter estimation. Unfortunately, the values of Fisher matrix vary by many orders of magnitude, and ...
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I am trying to use CVXPY to optimise signal-to-noise-plus interference ratio (SINR) for a visible light communication (VLC) system. I have one of my SINR constraints stated as
\begin{equation}
\...
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Greatest hits from previous weeks:
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What is the difference between explicit FEM and implicit FEM exactly? According to the post here, it seems that the only difference is whether implicit or explicit time integration is used.
As I ...
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What is the best way to get a visual appealing plot of a singular vector field (if you want to visualize also the field strength). As an example I am playing with the electric fields of two point ...
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In FEM classes, it's usually taken for granted that the stiffness matrix is positive definite, but I just can't understand why. Could anyone give some explanation?
For instance, we can consider the ...
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Thomas algorithm can be used to solve a tridiagonal matrix:
$$
\begin{bmatrix}
{b_ 1} & {c_ 1} & { } & { } & { 0 } \\
{a_ 2} & {b_ 2} & {c_ 2} & { } & { }...
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I implemented an algorithm to find the alpha shape of a set of points. The alpha shape is a concave hull for a set of points, whose shape depends on a parameter alpha deciding which points make up the ...
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Which one is better: FORTRAN or Python? And I guess that in both cases you need Gnuplot, am I right?
I'm working on a Windows machine at the moment.
I'd like to use it to get numerical solutions for ...
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Following from my previous question I am trying to apply boundary conditions to this non-uniform finite volume mesh,
I would like to apply a Robin type boundary condition to the l.h.s. of the domain (...
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Can you answer these questions?
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In model predictive control, an optimization problem is solved at every time instant and it is very common to write down the matrices in a compact form. Without going into the details of the ...
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The model is
$$y_i=\beta\big(x_{i1}^\alpha+x_{i2}^\alpha+...+x_{im_i}^\alpha\big)+\epsilon_i\textrm{ for }i=1, 2, ..., n$$
I want to minimize the MAE, i.e.
$$\Sigma_{i=1}^n{\big|y_i-\beta\big(x_{i1}^\...
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How to solve/assess the following problem?
Given: $N$ ingredients like apples, bread etc. Mass of an ingredient $j$ is in this simplified model a sum of macro nutrients carbohydrates, proteins and ...
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