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**Content Feed**

Interpreting eigenvalues and eigenvectors when using symbolic toolbox

I'm getting both 4 eigenvalues and 4 eigenvectors when running your code: linkMatrix = [0,1/3,1/3,1/3; 0,0,1,0; ...

1 giorno ago | 0

| accepted

Different behaviour in indexing between table and digraph node table

This is a bug in digraph, thank you for reporting it! I have passed it along and it will be fixed in a future release.

7 giorni ago | 0

| accepted

Linking nodes using links in a graph based on information from another layer

You could represent the first layer as a graph object, adding coordinate information for each node to the Nodes table. For the s...

7 giorni ago | 0

Error message when trying to compute EOF with covariance matrix.

The problem is that the covariance matrix becomes very large here. Luckily, it's not necessary to compute this matrix explicitly...

11 giorni ago | 0

| accepted

Sorting eigenvectors using symbolic toolbox for PageRank algorithm

There's an unknown variable in the value you pass to sort, so this won't be sorted by magnitude as the magnitude isn't known. H...

13 giorni ago | 0

| accepted

eigenvalue and eigenvector of free vibration while stiffness matrix is not invertable

If eig has been working well for the size of your problem you could consider using [U, D] = eig(K, M); %this solves K*U = M*U*D...

13 giorni ago | 1

| accepted

Finding a node in graph with most mutually adjacent nodes

Thanks for adding the tag, Steve! Here's another idea for how to do this. So you want to find all pairs of edges that go a->b a...

18 giorni ago | 1

| accepted

eigen value what i am getting from matlab software that is not exact when i am compairing with hand calculated value and the mode shape i am getting is reverse

The results look correct to me, can you say what you are expecting instead? Two points that are maybe relevant: MATLAB does num...

26 giorni ago | 0

The node number in the digraph does not match the node number used in shortestpath().

Try putting the node numbers in quotes: [path,d, edgepath] = shortestpath(G,"228","231"); You have given each node a name, and...

circa un mese ago | 1

| accepted

Unitary matrix with non-orthogonal eigenvectors?

The short answer is that it's possible to compute an orthonormal basis of eigenvectors for an orthogonal matrix, but that MATLAB...

circa un mese ago | 2

| accepted

Eigenvalue problem on non-Hermitian matrix

You can think of it like this: If there is an invertible V such that inv(V)*H*V=D, then you can expect that the matrix myW = inv...

circa un mese ago | 0

| accepted

Seasonal Breakdown from a Time Series data

Perhaps the trenddecomp function would be useful? It has an optional input period where a vector of several periods can also be ...

circa un mese ago | 0

How to find all the downstream nodes from a node in a graph?

Looking at this again due to the recent comment added, it might be simpler to use a directed graph instead of an undirected one:...

circa 2 mesi ago | 1

Which solver should I use to solve a square and symmetric, linear system of equations?

The first thing to check is the size and density of your matrix. The SYMMLQ function you mentioned is one of a group of methods ...

2 mesi ago | 1

| accepted

Can we compute the graph Laplacian matrix for a directed graph?

It depends how you want to define it, there is no one consistent definition of what the graph laplacian of a directed graph is. ...

2 mesi ago | 1

| accepted

eigs using 'smallestabs' vs scalar

Hi Jack, I had initially misunderstood that you were getting different results when passing in 'smallestabs' vs. passing in the...

3 mesi ago | 0

| accepted

missing eigenvector when using eig on defective matrix

The short answer is that this is a case where a small change in the input matrix has a large effect on the eigenvectors being co...

3 mesi ago | 1

| accepted

THE GRAPH FUNCTION DOESN'T CONSIDER WEIGHTS

Hard to say what's going wrong without seeing your code. Here's an example where you can see the weights being used to decide on...

4 mesi ago | 1

| accepted

mldivide (backslash): advantage by using sparse matrix instead of a full matrix with respect to the quality of the results?

The condition estimate used in mldivide to decide if a warning should be given is much less accurate for the sparse case. This i...

4 mesi ago | 2

| accepted

LDL does not support complex symmetric matrices

Largely the reason LDL doesn't support this is that it's less commonly requested for complex symmetric matrices than for complex...

4 mesi ago | 0

| accepted

Inconsistency in behavior of SVD

Firstly, I agree completely with John's great explanations above: Any singular value below eps*first singular value should be tr...

5 mesi ago | 3

| accepted

Accuracy Problem when solving linear equation system using: lu(S) vs. decomposition(S,'lu')

The version in decomposition does some optional steps of iterative refinement: It uses the same solution you have above based on...

5 mesi ago | 0

| accepted

Need help fixing errors on code written in old MATLAB syntax

I'd also recommend replacing the calls svd(A) and svd(A, 0) with calling svd(A, 'econ'), since the code here is only using the f...

5 mesi ago | 0

Different results on different computers, Matlab 2021b - 64 bit, windows 64 bit, both Intel chips

First, about "which value to trust?" Both values are equally trustworthy, the differences in results come down to applying the ...

5 mesi ago | 1

| accepted

eigs with Extended Capabilities

The first of these would only be useful if you need to apply EIGS to many problems in parallel, in which case each of these coul...

5 mesi ago | 1

How to parallelize many small SVD's on a GPU

As of R2021b, there is a function pagesvd which is supported on both CPU and distributed arrays. It's not supported for gpuArray...

5 mesi ago | 2

| accepted

How does shortestpath function work?

Every edge has a number, which is the order in which they appear in the Edges table (try displaying g.Edges). The edgepath conta...

5 mesi ago | 1

| accepted

Eigs passes the wrong StartVector

The standard method used in EIGS is only efficient for matrices that are quite large. When eigs detects that the input matrix is...

6 mesi ago | 0

| accepted

How to enhance the performance of Matalb's function sqrtm?

Not in general. You might be able to find a cheaper but less accurate way to compute this, but if that's acceptable would depend...

6 mesi ago | 0

fastest path between more than two nodes

To compute simply the shortest-path distance, you can use the distances function and pass in a graph object you've constructed u...

6 mesi ago | 1