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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
Find orientation of a blade-shaped object
I would like to measure its orientation with an accuracy close to 0.1°. The accuracy will be influenced by the quality of your ...

2 dagar ago | 0

| accepted

Answered
vpasolve finds no solutions except the null solution
With numerical algorithms like vpasolve, you never can tell what it will find, if anything. In any case, lsqnonlin seems to offe...

3 dagar ago | 0

| accepted

Answered
How to fill a blank cell with the value of the cell above it in a table?
The only line of code you need is this one data.Var1=fillmissing(data.Var1,'previous') Get rid of the lines around it. Var1={...

3 dagar ago | 0

| accepted

Answered
How to put a legend outside of a tiled layout graph?
TL=tiledlayout(4,1); %Outer Layout tl=tiledlayout(TL,3,1); %Inner Layout -- child of TL tl.Layout.Tile=1; tl.Lay...

3 dagar ago | 0

Answered
polyshape fractures after multiple merges
Perhaps I don't fully understand the logic of your loop completely, but I definitely think subtract() is more appropriate here t...

5 dagar ago | 0

| accepted

Answered
When using assignin in subfunction A to create a variable in the workspace of subfunction B, the variable is being overwritten by a MATLAB built-in function with the same name
The real solution is this, function output = test_beta(input) output = test_beta2(input); end function beta=test_beta2...

5 dagar ago | 2

| accepted

Answered
Non-linear scaling for linear increase in complexity
It is because you are applying property validations {mustBeFloat, mustBeNonnegative} on the x property. This means that in every...

6 dagar ago | 0

| accepted

Question


Numeric vector indexing slows down when the vector is a struct field. Why?
In the speed comparision below, the only difference between Version 1 and Version 2 is that the vector being updated is the fiel...

7 dagar ago | 1 answer | 0

1

answer

Answered
how to read in a curved region of interest that is one plane?
I don't quite understand what you are trying to do, but I have the vague impression you are trying to interpolate an image on a ...

7 dagar ago | 0

Answered
What coordinate system does regionprops assume for orientation angle?
You can still view the Orientation properties coordinate system as x-right, y-down, z-into-screen. However, the direction of pos...

7 dagar ago | 0

| accepted

Answered
Which dimension(s) does trainingOptions shuffle apply to?
You can use analyzeNetwork to see which dimension is the batch dimension.However, I believe it will always be the last dimension...

9 dagar ago | 0

| accepted

Answered
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...

9 dagar ago | 0

| accepted

Answered
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 ...

10 dagar ago | 0

Answered
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');

10 dagar ago | 0

| accepted

Answered
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)'; %...

12 dagar ago | 0

Answered
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....

12 dagar ago | 0

Answered
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...

13 dagar ago | 0

Answered
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...

13 dagar ago | 0

| accepted

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...

14 dagar 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...

14 dagar ago | 1 answer | 0

1

answer

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...

15 dagar ago | 0

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

15 dagar 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 = ...

15 dagar 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, ...

15 dagar 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...

16 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., ' ', ' ...

17 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...

17 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...

17 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...

18 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...

19 dagar ago | 1 answer | 0

1

answer

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