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Backslash error ''Warning: Matrix is singular to working precision."
For more details about what backslash does for sparse matrices, use spparms('spumoni', 1) cnew = Amat \ rhs; This will displa...

6 years ago | 1

Answered
SVD freezes in 2018a
This sounds like a bug. It shouldn't be due to memory issues, SVD uses the same amount of memory if the matrix size and the synt...

6 years ago | 0

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Answered
generalized eigen-problom, complex non-symmetric matrix, how to find orthogonal eigenvectors
There's an easier way to compute both U and W: [U, D, W] = eig(A, B); This will make sure that the eigenvectors U(:, i) and V(...

6 years ago | 1

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Optimizing a matrix with cplexlp?
You can solve this using intlinprog. This is probably not the most efficient way of solving the problem, but reliable A = [0 1 ...

6 years ago | 1

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How SVD works for dimensionality reduction?
There's the svd function. The link points to the doc which has examples of how to use it.

6 years ago | 0

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chol fails on Hermitian positive definite matrix?
That is astonishing. The matrix is not badly conditioned, I would expect CHOL to work fine here. I tried on my machine and didn...

6 years ago | 0

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Answered
Sparsest solution for A\B
That statement is wrong, x = A\b doesn't return the solution x with the smallest number of nonzero elements. What mldivide does,...

6 years ago | 2

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Answered
eigs function: incorrect eigenvalues
The problem is that the matrix A is badly conditioned: >> cond(full(A)) ans = 2.206837183464466e+16 This is just around...

6 years ago | 2

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Plotting eigenmodes in 3D
Depending on the format of your 3D-frame, maybe you could use pdeplot3d.

6 years ago | 0

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matchpairs function in r2019a
The algorithm solves the same problem as the Hungarian algorithm, but it's not the same algorithm. The Hungarian algorithm has c...

7 years ago | 0

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Hungarian algorithm realizated in matlab
As of R2019a, there is a function matchpairs in core MATLAB (no toolboxes needed) that solves the same problem as the Hungarian ...

7 years ago | 6

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Hungary algorithm
As of R2019a, there is a function matchpairs in core MATLAB (no toolboxes needed) that solves the same problem as the Hungarian ...

7 years ago | 1

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Matching of eigenvalues of 2 matrices
With R2018a, there is a new function matchpairs which might be useful for this. Basically, it takes a matrix of similarities bet...

7 years ago | 0

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Answered
How to calculate n-th eigenvector using eigs() function
There's no way of doing this directly, and the indirect ways are hard to implement and not very robust. Also, this will be very...

7 years ago | 2

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Simulating a Markov chain
There is a specific class that represents a discrete-time Markov chain in the Econometrics toolbox: dtmc.

7 years ago | 0

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Delete Highlighted Node in a Graph?
You can use highlight to set that marker to 'none'. The GraphPlot object h contains all the graphical properties of the plotted ...

7 years ago | 0

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Yet another lu(A) question and pivoting
I'm afraid I can't post the algorithm used in mldivide. Note that it's a bit more general: it also works if both the rows and th...

7 years ago | 0

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Yet another lu(A) question and pivoting
Yes, MATLAB checks if L is a permuted triangular matrix. See the doc for mldivide - Algorithm for full inputs. However, it's st...

7 years ago | 1

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In sparse matrix eigs(A,k,sigma), how to specify both shift and direction
With a numeric sigma, EIGS uses a linear system solve (A-sigma*I)\v instead of A*v to compute the largest eigenvalues of the inv...

7 years ago | 0

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Answered
Is there a way to obtain all cycles of a directed graph similar to all_simple_cycles() in sage?
There's no direct function, but I've attached a solution I've quickly put together just now. This recursively iterates through a...

7 years ago | 1

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How to generate all the matrices of graphs for given numbers of vertices and edges?
I've attached a script that computes this for n=4 and e=3. This script will not scale well to larger numbers of nodes and edges,...

7 years ago | 1

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Which algorithm eig () function use ?
There are different algorithms for solving eigenvalue problems, depending on the properties of the inputs. The most well-known s...

7 years ago | 0

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Shotest path between any two nodes in the graph
To read data from Arcmap, you would probably need to use the Mapping Toolbox (for example shaperead). To use the shortest path a...

7 years ago | 0

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graph weight overlap and arrow size
There isn't a solution for this at the moment, unfortunately. One alternative would be to set the LineWidth based on the edge we...

7 years ago | 0

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Is it possible to set an alpha value for each edge in a GraphPlot?
Hi Michael, We do not provide a way to set EdgeAlpha to be different for each edge. We just didn't expect this to be very usefu...

7 years ago | 0

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eig function returning complex eigen vector values for a symmetric matrix, why?
EIG checks whether the input matrix is symmetric, in which case it chooses an algorithm that always returns real matrices. It ch...

7 years ago | 2

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Mex and digraph in C++
graph, digraph and table are MATLAB objects (meaning they are implemented as .m files). There is no C++ syntax to access such ob...

7 years ago | 1

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Decompose an N-dimensional array into outer products
Your last formula corresponds to the CP (canonical-polyadic) tensor decomposition. This is in a way the equivalent of the SVD fo...

7 years ago | 2

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Can i adjust nodes in digraph?
You can't directly drag the nodes of a GraphPlot object. Indirectly, you can modify the XData, YData and ZData properties of the...

7 years ago | 4

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2 problem with minspantree.m in Matlab 2018a
The properties Underlying and EdgeProperties are private properties of the graph object, which can only be accessed in methods o...

7 years ago | 3

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