Matt J

Last seen: Today | Active since 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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Answered
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...

ungefär 2 timmar ago | 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...

ungefär 9 timmar ago | 0 answers | 0

0

answers

Answered
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...

ungefär 21 timmar ago | 0

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

ungefär 22 timmar ago | 1

Answered
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 = ...

ungefär 22 timmar ago | 0

Answered
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, ...

ungefär 24 timmar ago | 0

| accepted

Answered
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...

2 dagar ago | 0

Answered
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., ' ', ' ...

3 dagar ago | 0

| accepted

Answered
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...

3 dagar ago | 1

Answered
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...

4 dagar ago | 0

Answered
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...

4 dagar ago | 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...

5 dagar ago | 1 answer | 0

1

answer

Answered
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 ...

5 dagar ago | 0

| accepted

Answered
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...

6 dagar ago | 0

Answered
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...

6 dagar ago | 0

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

7 dagar ago | 1

| accepted

Answered
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...

8 dagar ago | 0

Answered
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...

8 dagar ago | 0

| accepted

Answered
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...

9 dagar ago | 0

| accepted

Answered
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

9 dagar ago | 0

| accepted

Answered
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...

9 dagar ago | 0

| accepted

Answered
Non-linear constraints format for GA using solve function
I would formulate it as, N=numel(Pos_Input_mtx); problem.Constraints.c1=abs(Pos_Input_mtx(:)-Pos_Input_mtx(:)') >= (1-eye(N)...

9 dagar ago | 0

| accepted

Answered
Summing function handles of multiple variables across one of the variables
Nesting function handles n-fold is going to be very inefficient, and is usually not a good idea. Usually, it is best to vectoriz...

10 dagar ago | 0

Answered
Error using trainNetwork Invalid training data. For classification tasks, responses must be a vector of categorical responses. For regression tasks, responses must be a vector
Instead of using Matlab's dicePixelClassificationLayer, you can try the following custom output layer: classdef GeneralizedDice...

12 dagar ago | 0

Answered
Ifft2 results do not match that of irfft2 in Pyhton
I'm not a Python user, but if rfft2 only gives you positive x-frequencies, I would imagine it also only gives you positive y-fre...

13 dagar ago | 0

Question

Three dots at the end of a line of code
Why does one of my lines of code have three dots enclosed in a box? What does it mean? Clicking on it does nothing.

14 dagar ago | 1 answer | 0

1

answer

Answered
Looking for linear system Ax=0 precision improvements
s=max(abs(A),[],1); x = null(A./s)./(s')

14 dagar ago | 0

Answered
Finding x and y values of minimum z in 2-variable function.
The continuous minimum can't be at (5,2) as you claim. Direct evaluation shows that the value of z at (5.5,10) is lower. loopi...

14 dagar ago | 0

Answered
Using fft and ifft with less frequencies than input points
What I would want to do, is to insert an N, f.e. N=100, but get an array 10001x1. %Grid Nx = 100; L = 10; dx = L/(Nx-1); ...

14 dagar ago | 0

Question

Why does the Code Analyzer flag this as an error?
Why does the Code Analyzer flag this code as an error? It runs fine: try error("It's bad") catch ME warning('Error...

15 dagar ago | 2 answers | 0

2

answers