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**Content Feed**

Stability analysis of a time dependent Lyapunov equation

The tensorprod function doesn't do what you are looking for here, that would be kron (short for Kronecker product). It also see...

1 dag ago | 0

getting warning while using eigs on the matrices obtained from freefem++

If modifying the input sigma doesn't help, it's likely that for your call eigs(A, B, sigma, ...) the matrices are such that A - ...

17 dagen ago | 0

| accepted

Trying to construct a filtered graph using pmfg function that uses the (MATLAB-BGL) library in MacBook.

The problem seems to be with the MatlabBGL FileExchange package and specifically with the .mex files that are being provided the...

17 dagen ago | 0

| accepted

Can I get all of the shortest paths between all pairs of nodes in a Directed Graph in one function call

Using shortestpathtree in a loop over the starting node is the way to go. You can change the data format of the first output by ...

ongeveer een maand ago | 1

Inconsistency between Matlab eig() function and Matlab generated C code eig() function

For code generation, the eig function doesn't have as many special-case treatments as the eig function in regular MATLAB. This m...

ongeveer een maand ago | 2

| accepted

How to control the curvature of each edge when drawing graph object?

The curvature of the edges in this plot aren't controllable. You could turn off the edges from the graph plot, and use the plot ...

ongeveer 2 maanden ago | 1

eigs function works slowly

A possible issue is that "largestreal" option works less towards the strengths of the EIGS algorithm than the default "largestab...

ongeveer 2 maanden ago | 0

Why is my parfor loop running slower than a regular for loop

The problem is likely that the cost of each iteration is still too small to warrant the start-up time of the parfor loop. You c...

2 maanden ago | 0

Quick method in solving symmetric linear equation

You can definitely use iterative methods such as pcg. The success of this usually depends on how well-conditioned your matrix is...

4 maanden ago | 1

doc QR decomposition error

Hi, As you can see here, R is an m by n matrix and Q is an m by m matrix in the default behavior of the qr function: A = randn...

4 maanden ago | 0

Replacing old version graphshortestpath with new shortestpath function

You can replace [ dist,path{1} ] = graphshortestpath( adjMatrix, 1, numel(newImg(:))); with [ path{1}, dist ] = shortestpath(...

5 maanden ago | 0

Eigenvalues and Eigenvector computation on extremely bad conditioned matrices

If the matrix P has rank 120 and its size is 160, you should expect 40 eigenvalues to be Inf - this is how singularities in the ...

5 maanden ago | 0

QR factorization of a low rank matrix

Let's start with computing a rank-2 approximation of a large matrix. In general, this would be done using the SVD, but if you kn...

5 maanden ago | 0

Can additional information be added to the directed graph plotting node 'tooltip'?

Yes, you can do this using the dataTipTextRow function: nodeNames = {'Node A', 'Node B', 'Node C', 'Node D', 'Node E', 'Node F'...

6 maanden ago | 0

| accepted

computational complexity of svds

There is a recent function (introduced R2020b) called svdsketch, which is using randomized linear algebra. We recommend this for...

6 maanden ago | 0

Write Hamiltonian using kron function

For a 6-dimensional Kronecker product, you would want to take Sz = [1 0; 0 -1]; I = [1 0; 0 1]; and apply the Kronecker produ...

6 maanden ago | 0

Algorithm for edge connectivity of a digraph?

There is no direct method in MATLAB for computing the edge connectivity. Based on the Wikipedia page, you should be able to comp...

7 maanden ago | 0

| accepted

Get coordinates of 3-D force-directed graph plot without plotting?

There isn't currently such a function available. For the example above, nearly all the time is being spent in computing the coo...

7 maanden ago | 0

| accepted

Obtain eigs from matrix and partially known eigenvector

Hi Jennifer, You are right that matrix P here is a block-diagonal matrix with three blocks: [A 0 0; 0 B 0 0 0 C] And for su...

8 maanden ago | 1

| accepted

finding degree and neighbor of each vertex in a subgraph H but indexing according to original graph

I think the easiest will be to build on what you started by giving the nodes in graph G names which are just the string version ...

8 maanden ago | 0

Change of parameters of Gates in quantumCircuit does not take effect

This is a bug, thank you for reporting it. As a workaround while waiting for this to be addressed, pleaseconstruct a new gate in...

8 maanden ago | 1

| accepted

how to find neighbors/degree of hyperedges of a uniform hypergraph?

MATLAB doesn't support hypergraphs, but often a specific problem can be solved with just a graph or multigraph, by interpreting ...

8 maanden ago | 0

| accepted

LU decomposition algorithm change

As you point out, this kind of difference in result is to be expected and is well withing expected round-off behavior. Another ...

9 maanden ago | 1

How can I plot a multilayer graph (2 layer) starting from adjacency matrices?

Here's an example of how to do this (using just some random data, since I don't have the matrices you mention above). % Choose ...

11 maanden ago | 1

| accepted

How to create a random graph that is connected?

If an undirected graph is connected, it must contain at least one path that visits each node at least once. You could construct...

11 maanden ago | 0

I have a question about the distributed computing of the eig function.

EIG for distributed arrays calls into the ScaLAPACK library - the references given by ScaLAPACK documentation would be the best ...

11 maanden ago | 1

| accepted

non linear eigen value problem

This isn't the standard definition of a nonlinear eigenvalue problem, where you would have only one scalar lambda. Am I underst...

11 maanden ago | 0

Issues with the normalisation of mode shapes?

eig(A, B) normalizes the eigenvectors in the B-mass norm, but only if it recognizes the input as a symmetric problem (A is symme...

ongeveer een jaar ago | 0

| accepted

Proof of relation between the generalized singular values of gsvd(A,B) and gsvd(B,A)

The background for this is the 5-output form of the GSVD: [U,V,X,C,S] = gsvd(A,B) returns unitary matrices U and V, a (usually)...

ongeveer een jaar ago | 0

Update a sparse matrix efficiently

The fastest way to construct a sparse matrix will be when the inputs are sorted, first by columns and then by rows. You can veri...

ongeveer een jaar ago | 1