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Christine Tobler


MathWorks

170 2015 年以降の合計貢献数

Professional Interests: numerical linear algebra, graph algorithms

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Christine Tobler's バッジ

  • Revival Level 2
  • 12 Month Streak
  • Knowledgeable Level 3
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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...

2日 前 | 0

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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,...

8日 前 | 2

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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...

10日 前 | 2

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

13日 前 | 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...

21日 前 | 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 ...

21日 前 | 0

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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 ...

21日 前 | 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...

24日 前 | 0

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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...

27日 前 | 1

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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.

約1ヶ月 前 | 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 ...

約1ヶ月 前 | 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...

約1ヶ月 前 | 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...

約2ヶ月 前 | 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...

約2ヶ月 前 | 0

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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...

約2ヶ月 前 | 0

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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,...

2ヶ月 前 | 0

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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...

2ヶ月 前 | 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...

3ヶ月 前 | 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...

3ヶ月 前 | 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...

4ヶ月 前 | 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...

4ヶ月 前 | 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...

4ヶ月 前 | 0

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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...

4ヶ月 前 | 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...

4ヶ月 前 | 2

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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...

5ヶ月 前 | 3

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How to customize arrow of directed graph (digraph)
Since R2018b, there is a property ArrowPosition which allows the arrowhead to move around along the edge. There is no way of ch...

5ヶ月 前 | 1

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how to plot graph without intersection?
It sounds like you are looking for functionality related to planar graphs. MATLAB does not have any methods specific to this, bu...

5ヶ月 前 | 0

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How to work with quite large matrices?
The matrices A\B and A\C are very likely to be dense, even if A, B, C are sparse matrices. Since these are of size 400'000, no m...

6ヶ月 前 | 2

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What is the best method to solve large linear system equation (Ax=b) (A:million~ by million~)
You can try one of the Iterative Methods and Preconditioners.

6ヶ月 前 | 0

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How many arithmetic operations does matlab require to determine the Schur decomposition?
The second step in computing the Schur decomposition is the QR algorithm, not the QR decomposition (unfortunately the names are ...

6ヶ月 前 | 0

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