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Matt J


Last seen: Today Active since 2010

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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
Non-linear data fit with multiple constants
Though your post's title says the fitting problem is nonlinear, it is actually linear when b and d are known, and so has a simpl...

4 hours ago | 0

Answered
Memoize an anonymous function with externally scoped variables
One solution is to rebuild the anonymous function inside the memoized function using a container class: mf=memoize(@subfunc); ...

1 day ago | 0

Question


Memoize an anonymous function with externally scoped variables
I am trying to memoize a function that takes an anonymous handle with an externally-scoped parameter as input. The problem is th...

1 day ago | 3 answers | 0

3

answers

Answered
Is there a way to insert a common ylabel to secondary axes in a tiled layout?
t = tiledlayout(2,2); for i = 1:4 f = figure(1); ax = nexttile; yyaxis left x = (1:10); y = rand(1,10)...

6 days ago | 0

Answered
How does Matlab interact with custom Diffusion models?
From what I've read, simple diffusion U-Nets are well within Matlab's reach. For very advanced models like LDF-VFI, Matlab can d...

6 days ago | 0

Answered
transfer learn without losing old memoy YoloX
Continual learning is a serious research topic.There are no off-the-shelf tools in Matlab to do it in a sophisticated way. You w...

7 days ago | 0

| accepted

Answered
How to flatten an image and find dimensions?
Find the 4 vertices of the outer ellipse (i.e., the end points of the major and minor axes). This can be done manually with draw...

10 days ago | 0

Answered
help with XYZ data file
This might be what you're looking for: zq=fspecial('gaussian',200,40); Nlevels=5; zRanges=linspace(min(zq(:)) ,max(zq(:))...

14 days ago | 0

Answered
help with XYZ data file
First question, I would like to be able to plot some of the planes of XY with fixed Z values/range. The terminology "planes of...

15 days ago | 0

Submitted


Quadratic minimization with norm constraint
Minimizes convex or non-convex quadratics subject to (in)equality constraint on norm(x)

16 days ago | 3 downloads |

4.5 / 5

Answered
How to find a rotation vector for use in rotate, if the rotation matrix is rank deficient?
Probably easier to use hgtransform, which allows you to perform the rotation by specifying only the rotation matrix.

17 days ago | 0

Answered
Find specified number of points on curve with identical chord length (not arc length)
Here's an approach using fminbnd to minimize the attached cost function circleMarch(). t=linspace(0,200,1e4)'; %%% XY=[cosd...

18 days ago | 0

| accepted

Answered
How to use custom YOLO models in MATLAB?
If you have the Deep Learning Toolbox, you can use minibatchpredict.

19 days ago | 1

Answered
How to remove unwanted double image in plot
It is possible your points are not sorted in ascending order of x.

19 days ago | 0

| accepted

Answered
How can you make multi-line axis labels with TeX not left-justified in R2026a?
Here's an attempt using the idea of separate text boxes that you mentioned. It wasn't too bad, although, it doesn't have the abi...

20 days ago | 0

Answered
How can you make multi-line axis labels with TeX not left-justified in R2026a?
xlabel({'normal'; '\textbf{bold}'}, ... 'Interpreter','latex')

21 days ago | 0

Answered
How to find a function in the path - securely?
Perhaps as follows? safeWhich('num2cell') safeWhich('varargin') safeWhich('R') safeWhich('p') safeWhich('queryName') ...

22 days ago | 1

| accepted

Answered
Colorbar with background image
You can use this as a template: % Create sample data [X,Y] = meshgrid(linspace(-3,3,200)); A = exp(-(X.^2 + Y.^2)); ...

23 days ago | 0

Answered
Only version 2026a appears available for download as a trial. I want version 2025b
If you Contact Sales, you might be able to arrange a trial version of your choice with them directly.

24 days ago | 0

Answered
How to use fft on the continuous time signal
Here is the proper way to set up the time and frequency sampling axes: tau = 1*10^-9; % tau %Set up frequency and time sampl...

25 days ago | 0

| accepted

Answered
textscatter example, and behavior, is mysterious
Here's an alternative, whose behavior you might like better: rng("default") n = 11; x = rand(n,1); y = rand(n,1); str = str...

26 days ago | 0

Answered
Can you get matlab to add a really small number to a big number and retain precision
Can you get matlab to add a really small number to a big number and retain precision You can, but it is better to just reorgani...

26 days ago | 1

Answered
Why is Preallocating arrays important in MATLAB, and how does it improve performance compared to dynamically growing arrays?
When it is acceptable to avoid preallocation Looping backwards is an alternative to pre-allocating. You're not really "avoidin...

27 days ago | 0

Answered
Does dicomreadVolume automatically rescale the image?
You should manually apply it.

28 days ago | 0

| accepted

Answered
When plotting 3D graphs in MATLAB, can the x and y axis labels be made flush with the x-y plane, as shown in the figure below?
There are some File Exchange compositions that seem to be able to do it, e.g., https://www.mathworks.com/matlabcentral/fileexch...

1 month ago | 0

| accepted

Answered
How to add a shared ylabel on the right hand-side of a figure, when combining tiledlayout and yyaxis?
One way. t = tiledlayout(4,1); for i = 1:4 nexttile title("Tile"+i) yyaxis left plot(rand(1,10)) ...

1 month ago | 1

Answered
trainnet function - randomness and repeatability
In addition to random initialization of the Learnables, as mentioned by @Steven Lord, you are using the default Shuffle setting,...

1 month ago | 0

Answered
Eigendecomposition not fully utilizing all cores on M1 pro, matlab 2025b
Perhaps bundle the jobs together using pageeig?

1 month ago | 0

Answered
Use ginput in a datatip
There is imdistline, but it requires the Image Processing Toolbox.

1 month ago | 0

Answered
Given an observer looking to the center of an ellipsoid, how can I determine the distance through the ellipsoid if none of the axes are aligned with this look angle?
Given an observer looking to the center of an ellipsoid After converting to ECEF coordinates, xc=[xc1;xc2;xc3] ...

1 month ago | 0

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