Matt J

Last seen: Today | Actif depuis 2009

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Professional Interests: medical image processing, optimization algorithms PLEASE NOTE: I do not read email sent through my author page. Please post questions about FEX submissions in their respective Comments section.

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Réponse apportée
finding partial solutions from ill-conditioned equations
If you don't know the subset, you could download licols from the File Exchange, https://www.mathworks.com/matlabcentral/fileexc...

environ 14 heures il y a | 0

Réponse apportée
finding partial solutions from ill-conditioned equations
If you know which x(i) are well-determined, you could use lsqminnorm. In this example, we know that only x(1:2) are well-determi...

environ 15 heures il y a | 0

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Optimization method based on the Nonlinear least squares as well as fmincon for the defined objective function (Non-linear function).
The goal is to use some inverse method to get the same 3D datasets; therefore, after defining the objective function, I applied ...

environ 19 heures il y a | 0

Réponse apportée
Optimization method based on the Nonlinear least squares as well as fmincon for the defined objective function (Non-linear function).
If you have the Computer Vision Toolbox, you could try triangulateMultiview.

1 jour il y a | 0

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I am encountering a persistent error with the predict function in the Deep Learning Toolbox within MATLAB 2024b.
You need, testDlarray = dlarray(randn(inputSize,1), 'CB'); or, testDlarray = dlarray(randn(1, inputSize), 'BC');

1 jour il y a | 0

| A accepté

Réponse apportée
I have a N*N matrix depicting the intensities at different points in a circular plane. They are different intensities on a disc. How to plot the image?
clc, close all force N = 10; % Number of polar samples M = peaks(N); % Example heat map data T = linspace(0, 2*pi, N)'; %...

3 jours il y a | 0

Réponse apportée
Parpool in Pattern search with temp directories
The process continous but i get these warnings:Warning: Unable to create a parallel pool. Continuing with evaluations in serial....

3 jours il y a | 0

Réponse apportée
Fittype that calls a subfunction and integration with appdesigner
Your model is linear (in p). Using a nonlinear least squares fitter is super inefficient. So, instead, you should do, A = cell...

4 jours il y a | 0

Réponse apportée
Diff does not work with symmatrix
Element-wise exponentiation is not a standard matrix algebra operation. I imagine it is for that reason that symmatrix.diff() do...

4 jours il y a | 0

| A accepté

Réponse apportée
How to call a centralized class from multiple deployed applications
If the platform is Windows then, according to ChatGPT, you can deploy the class as a COM server, so that another deployed MATLA...

5 jours il y a | 0

Question

Define a custom input layer in the deep learning toolbox
In the Deep Learning Toolbox, it is possible to define one's own custom output layers and hidden layers. Is there no way to defi...

5 jours il y a | 1 réponse | 0

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Réponse apportée
How to plot a loss function in reinforcement learning
This File Exchange submission looks reasonably popular, but I haven't used it myself, https://www.mathworks.com/matlabcentral/f...

6 jours il y a | 0

Réponse apportée
Is it possible to reduce this for loop into one line of code?
Headers = findMissing(Headers); %One line

6 jours il y a | 1

Réponse apportée
Pagewise multiplication along a dimension without using a for loop?
If you can build X in cell array form, instead of 4D form, you can save some time as well: X = randi([1 10],2,2,10,5); Xc = ...

6 jours il y a | 0

Réponse apportée
pinv failing on single precision matrices
It doesn't look like a bug. Contrary to what you claim, the matrix is not very invertible, showing a condition number of ~1e7, ...

6 jours il y a | 0

| A accepté

Réponse apportée
freeze some weights inside of a fullconnected layer
It is possible with a custom layer. See this recent, related thread, https://www.mathworks.com/matlabcentral/answers/2174601-ho...

7 jours il y a | 0

Réponse apportée
Cell2table issues when a numerical column is read as strings
I would also have many columns, some of which could be made up of: (a) all doubles (b) a mix of empty strings (e.g., ' ', ' ...

8 jours il y a | 0

| A accepté

Réponse apportée
Pagewise multiplication along a dimension without using a for loop?
No, but looking at your code, I would guess that the speed is being encumbered much more by the operation length(X(1,1,1,:)) tha...

8 jours il y a | 1

Réponse apportée
Add a class folder to path
Nothing is wrong. @-directories should not and do not need to be on the path as long as their parent directory is. You can auto...

8 jours il y a | 0

Réponse apportée
How to read all rows of an Excel with missing rows included?
ActiveX can be used to determine the last row/column of the worksheet: Then, you can force readcell to read in a larger range wi...

9 jours il y a | 0

Question

Make gca() responsive to appDesigner axes clicks
I have an appdesigner app such as below with a uipanel containing regular images (not uiimages). I also have many, many standal...

10 jours il y a | 1 réponse | 0

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Réponse apportée
polyshape not closing a circle
An added complication is that the resulting union may have multiple regions, so I cannot just duplicate the first vertex to the ...

10 jours il y a | 0

| A accepté

Réponse apportée
How can I create multiple function handles in a for loop?
The best would be to just have a matrix-valued function, fun=@(x) x.^2-mymat(:).*x+mymat(:) but you could make a cell array of...

11 jours il y a | 0

Réponse apportée
Filtering Blobs on a Binary Image
If you can form an under-estimate of the extent of the blobs, let's call them sub-blobs, then you can fit a Gaussian lobe to the...

11 jours il y a | 0

Réponse apportée
Why does the Code Analyzer flag this as an error?
Mathworks Support has classified it as a bug.

12 jours il y a | 1

| A accepté

Réponse apportée
How do you change the output dimension of a NN layer?
Should I flatten the inputs and then concatenate them similar to this example? Probably. See if the attached network does what...

13 jours il y a | 0

Réponse apportée
Display a small matrix as a gray scale image
T2 =[ 0.4706 0.9804 0.8392 0.3216 0.9804 0.8392 0.3216 0.4706 0.8392 0.3216 0.4706 0.9...

13 jours il y a | 0

| A accepté

Réponse apportée
How to freeze specific neuron weights in a feedforward network during training process?
I don't think you can do it without the Deep Learning Toolbox. If you have the Deep Learning Toolbox, you can define a custom la...

14 jours il y a | 0

| A accepté

Réponse apportée
Please help with this multiplication problem
You can multiply directly. Example: [m,n,r]=deal(3,4,2); A=rand(m,1,r); B=rand(1,n,r); C=A.*B; whos A B C

14 jours il y a | 0

| A accepté

Réponse apportée
sub2ind() errors out with NaN inputs - handled differently since R2024a
You can get the old behavior back if you need it, Sub2Ind([ 3 5 7], [ 3 3], [2 2], [1 nan]) function out=Sub2Ind(sz,vararg...

14 jours il y a | 0

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