Christine Tobler
MathWorks
Professional Interests: numerical linear algebra, graph algorithms
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Content Feed
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...
7 dagen 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...
12 dagen ago | 1
Follow a complex eigenvalue in a spectrum at different times
You could try using the matchpairs function: rng default; d = randn(20, 1) + 1i*randn(20, 1); d2 = d + 0.1*(randn(20, 1) + 1i...
15 dagen ago | 0
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Error using eig in Matlab 2021b by using Parallels 17 of Macbook Pro (M1 )
Since MATLAB is trying to load a .dll file, I'm assuming you're running a Windows VM on this Macbook Pro. MATLAB doesn't support...
21 dagen ago | 0
use of svds with function handles
The svds function needs to be able to apply both A*x and A'*x, so your function handle should accept a second input which is eit...
25 dagen ago | 2
How to compute cholesky to all slice of a tensor?
There isn't another way to do this right now. We have functions that do other linear algebra operations to each page of an ND-ar...
ongeveer een maand ago | 1
Why does mldivide solve equations so fast that FORTRAN can't compare it？
MATLAB's mldivide uses multithreading. It doesn't use the GPU unless you have the Parallel Computing Toolbox and are using the g...
ongeveer een maand ago | 0
How to highlight single edges in an undirected graph?
Do you still want the multiple edges to be displayed? If not, you can use the simplify command to reduce all multiple edges to j...
ongeveer 2 maanden ago | 1
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Unable to find out left eigen vectors of symbolic matrix
The left eigenvectors are still expressed as right eigenvectors of M', meaning they satisfy a slightly different equation: syms...
ongeveer 2 maanden ago | 0
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Program to find connected and non-isomorphic graphs
In the last loop, you are checking if adj is isomorphic to any previous graph. If there is one graph that adj is not isomorphic ...
ongeveer 2 maanden ago | 0
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How can I invert a big matrix e.g. 1000-by-1000
When running inv on this matrix, there's a warning: >> M = inv(current_Fit_Mat); Warning: Matrix is close to singular or badly...
3 maanden ago | 0
Add an automatic TOC to an .mlx
You can go the "Insert" tab (just to the right of where it says "Live Editor" on top of the MATLAB window) and there's a button ...
3 maanden ago | 0
How to get a Table Contents in Live Script .mlx export to HTLM
You can go the "Insert" tab (just to the right of where it says "Live Editor" on top of the MATLAB window) and there's a button ...
3 maanden ago | 0
How is SVDS execution time related to the target rank?
So the goal of svds is usually to compute a requested rank that is much smaller than either size of the input matrix. A search s...
3 maanden ago | 0
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How to solve eigs/checkInputs issue in EOF analysis?
The error here is happening because R eof>mycaleof is an empty matrix, and eof is trying to compute an eigenvalue of it. Looking...
3 maanden ago | 0
How to make the color in the "highlight" function stronger and well defined (not pale/transparent as by default) ?
Set h.EdgeAlpha = 1;
3 maanden ago | 0
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How to find out isolated subgraph?
The component output in your code is the number of components. You can use the second output of conncomp to get a vector contai...
3 maanden ago | 1
Find all cycles (or the initial node of each cycle) in a very large directed graph (12m nodes, 6.7m edges)
Have you tried using 'MaxNumCycles' to only compute the first 100 / 1000 / 1e4 cycles? That could give some indication if it's c...
4 maanden ago | 1
Finding number of independent pathways in a graph
I'd expect the call to rmedge is the most expensive here. You could instead add edge weights for every edge in the graph, and th...
5 maanden ago | 0
Feature for eigs involving just positive eigenvalues
There's no option to do so directly, since it's not a common request and there's already a lot of option names in EIGS to dig th...
5 maanden ago | 0
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Large sparse matrix LU decomposition
If the call to lu runs out of memory, but the call to decomposition(__, 'lu') doesn't, likely the reason is that decomposition u...
5 maanden ago | 0
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Facing a unbalanced matrix, such as 3*5000, why someone reduce the computational cost by svd(A*A') .
The computational complexity of svd (when using the 'econ' option, which is very necessary for matrices that are far from square...
5 maanden ago | 1
| accepted
Boundary 'edges' around node(s)
There is no option to do this as part of the graph plot directly. You can achieve it by turning off the node markers (set 'Marke...
5 maanden ago | 1
Minimum Spanning Tree - Path or Start-End
In general, you can't rely on the fact that a minimum spanning tree will just be one path. However, if you have a graph for whic...
6 maanden ago | 0
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how to determine efficiency centrality of a node in Matlab
There isn't an efficiency centrality implemented in MATLAB. Based on the paper I quickly read, it seems you would best compute t...
6 maanden ago | 0
Graph Laplacian and adjacency matrix
Take a look at pdist in the Statistics and Machine Learning toolbox. If you apply this to your matrix, and then call squareform ...
6 maanden ago | 0
Matrix inverse with svd
Use one of A = [ 2 4 6; 8 5 7 ; 0 3 1] [U,S,V] = svd(A); V*inv(S)*U' V*(S\U') % The formula you're using above puts the par...
6 maanden ago | 0
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Degree and influence of line of a node in network
The only reference for DIL I could find is a 2016 paper: Evaluating the importance of nodes in complex networks, J Liu, Q Xiong...
6 maanden ago | 2
| accepted
How to find all the edges connecting a specific node with other nodes?
Use outedges to find the IDs of all outgoing edges, or neighbors to find all nodes connected to by these edges.
6 maanden ago | 0
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Symbolic SVD for square matrix
The computation of the SVD in symbolic mathematics involves the solving of a polynomial equation of degree given by the size of ...
7 maanden ago | 1
