I would like to implement Singular Value Decomposition (SVD) in PHP. I know that there are several external libraries which could do this for me. But I have two questions concerning PHP, though: 1)...

I want to map an array of double to an existing MatrixXd structure. So far I've managed to map the Eigen matrix to a simple array, but I can't find the way to do it back. void foo(MatrixXd matrix,...

First off I must say that I'm new to matlab (and to this site...) , so please excuse my ignorance. I'm trying to write a function in matlab that will use Spectral Clustering to split a set of poin...

I use a function at Matlab: [V,D] = eig(C); I see that V and D are always sorted ascending order. Does it always like that or should I sort them after I get V and D values?

How do I find out eigenvectors corresponding to a particular eigenvalue? I have a stochastic matrix(P), one of the eigenvalues of which is 1. I need to find the eigenvector corresponding to the e...

I will explain what I am trying to do, as it seems to be relevant in order to understand my question. I am currently trying to do face recognition of people that step in front of a camera, based o...

Iam trying to calculate PCA of a matrix. Sometimes the resulting eigen values/vectors are complex values so when trying to project a point to a lower dimension plan by multiplying the eigen vector...

I'm trying to fit a 2D Gaussian to an image. Noise is very low, so my attempt was to rotate the image such that the two principal axes do not co-vary, figure out the maximum and just compute the st...

While using princomp() function in R, the following error is encountered : "covariance matrix is not non-negative definite". I think, this is due to some values being zero (actually close to zero...

Basically I'm trying to find the eigenvalues for matrix, and it takes about 12 hours. When it finishes, it says it couldn't find all the eigenvectors (actually barely any), and I'm skeptical about ...

eigenvalues, eigenvectors = linalg.eig(K) How can I print just eigenvectors of len(K). So if there is K, 2x2 matrix, I get 4 eigenvectors, how can I print just 2 of them if there is len(K)=2.... ...

I've searched a lot for this but I can't find any answer about how the two methods 'eig' and 'eigs' differ. What is the difference between the eigenvalues and eigenvectors received from them?

If I had a square matrix that is 1,000 by 1,000 could Lapack calculate the eigenvectors and eigenvalues for this matrix? And if it can how long would it take? Also what about for a 10,000 by 10,000...

I have an unsorted vector of eigenvalues and a related matrix of eigenvectors. I'd like to sort the columns of the matrix with respect to the sorted set of eigenvalues. (e.g., if eigenvalue[3] move...

I have this matrix A, representing similarities of pixel intensities of an image. For example: Consider a 10 x 10 image. Matrix A in this case would be of dimension 100 x 100, and element A(i,j) wo...