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Questions - eigenvector

Is eigenvector centrality in igraph wrong?

I am trying to improve my understanding of eigenvector centrality. This overview from the University of Washington was very helpful, especially when read in conjunction with this R code. However, wh...
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ZacharyST

r

igraph

eigenvector

node-centrality

r

igraph

eigenvector

node-centrality

Votes: 0

Answers: 1

Latest Answer

The result returned by igraph is not wrong, but note that there are subtleties to defining eigenvector centrality, and not all implementations handle self-loops in the same way. Please see what I wro...
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Szabolcs

A function to compute the eigenvalues in R when some are repeated

Following this post and more specifically this answer, I am trying to build from scratch an eigen() function in R to compute eigenvalues and eigenvectors. However, I have stumbled accross the problems...
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POC

r

eigenvalue

eigenvector

Votes: 0

Answers: 1

Latest Answer

The determinant touches, but does not cross, 0 at the two repeated eigenvalues. (Similar to how x^2 is never negative, but has both roots at 0.) AFAIK, uniroot is not suitable for finding those roots....
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jblood94

Creating a cube that is normal to an eigenspace in Matplotlib.pyplot

I am trying to make a cube where all the sides are normal to each of the eigenvectors, as a way to visualize principle stresses given any possible normal and shear stresses in 3d. I've tried using sim...
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Spenser Scruggs

python

matplotlib

matrix

rotation

eigenvector

Votes: 0

Answers: 1

Latest Answer

I figured it out, so basicaly the angles were wrong and the rotation matrices were not general enough. What I first needed to do was align the cube with one of the axies, I did this by rotating it onl...
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Spenser Scruggs

Creating a function that returns a dictionary with eigenvalue and eigenvector

I'm trying to create a function in Python that returns a dictionary with an eigenvector and it's corresponding eigenvalue: This is my working code so far: def eigenvectors(a): b = np.matrix(a) ...
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runner16

python

function

eigenvalue

eigenvector

Votes: 0

Answers: 1

Latest Answer

Does numpy.linalg.eig helps? https://numpy.org/doc/stable/reference/generated/numpy.linalg.eig.html If you want it exclusively as a dict you can simply use zip: a = np.array([ [1,2,3], [4,5,6]...
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Jordy Cuan

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