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Matt J


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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
splitapply does not retain ME stack
Run with Pause on Errors. Then the code will stop at the offending line:

2 jours il y a | 0

Réponse apportée
Effect of GA Parameters on Convergence
You need to look at the final fval achieved as a function of N. If the irregular solutions have a lower fval than the regular so...

3 jours il y a | 0

Réponse apportée
How to change the size / ratio of a figure
Perhaps as follows? axis tight dx=diff(xlim); dy=diff(ylim); xmax=dy/(9/11)/2; xlim([-xmax,+xmax])

6 jours il y a | 0

Réponse apportée
solving a system of linear equations where A is a 40*40 sparse matrix
You should use \. It's not just about precision, though. It's also about speed: A=sprand(400,400,0.2)+speye(400); b=rand(400,1...

6 jours il y a | 1

Réponse apportée
Is the Order of Function Evaluation Guaranteed when Function Outputs are Concatenated into an an Array?
This reasoning might not be bulletproof, but I think the order of funtion calls in any expression has to always go left to right...

8 jours il y a | 0

Réponse apportée
Calculating 6D Estimation (3 Translations and 3 Rotations) from Two Orthogonal Detectors Output ((X, Y, Thea, Roll)
Spreaking for myself, the provided Fig1.png does not help me understand how a 6DOF 3D pose maps to a 4DOF projected pose (X, Y, ...

8 jours il y a | 0

Réponse apportée
Unable to move editor pane to rightmost column
One way is to right-click on the command window bar and select the appropriate option from "Move Command Window": ...

10 jours il y a | 0

Réponse apportée
Use of matlab.apps.AppBase outside of AppDesigner
It's not clear why you would need to migrate away from them if they do what you want. If you need a deeper understanding of what...

10 jours il y a | 0

Question


Mixing name/value pair syntax
In a Matlab seminar a few years ago, I asked why function calls that mix old style and new style name/value pair syntax would on...

11 jours il y a | 1 réponse | 2

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A soumis


arrayfun with scalar expansion
Version of arrayfun which allows argument arrays to have different sizes, so long as they are compatible for scalar expansion.

11 jours il y a | 1 téléchargement |

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Discussion


Would comma-separated list expansion for non-cell arrays be a good thing?
Frequently, I find myself doing things like the following, xyz=rand(100,3); XYZ=num2cell(xyz,1); scatter3(XYZ{:,1:3}) Bu...

11 jours il y a | 0

Question


Would comma-separated list expansion for non-cell arrays be a good thing?
Frequently, I find myself doing things like the following xyz=rand(100,3); XYZ=num2cell(xyz,1); scatter3(XYZ{:,1:3}) But...

11 jours il y a | 1 réponse | 0

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Question


Performance of MEX versus builtin functions
When Matlab calls a MEX file, is there overhead that makes the call slower as compared to a built-in binary like min, max, etc.....

12 jours il y a | 1 réponse | 0

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Réponse apportée
Putting spaces between elements of a string/
A=['011001110000' '101111000000' '110100011000' '011010001100' '010101000110' '110010100010' '1000010100...

13 jours il y a | 1

Réponse apportée
Implicit expansion with arrayfun (cpu vs gpu)
Remember that arrayfun (on the CPU) is nothing more than an M-Code for-loop in disguise. Therefore, it is not hard to write your...

14 jours il y a | 1

| A accepté

Réponse apportée
Implicit expansion with arrayfun (cpu vs gpu)
I agree it is confusing, but the gpuArray version of arrayfun was never intended as a direct analgoue of the CPU version. Additi...

14 jours il y a | 1

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How to prevent image cropping after registration?
The problem is my fixed image only covers the top half of the head whereas I want the output to contain the whole head. But th...

16 jours il y a | 0

Question


Adding a class-related function to appdesigner app
Is there a way, in appdesigner, to create a class-related function, i.e., a function that is local to the app's classdef file, b...

16 jours il y a | 1 réponse | 0

1

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Réponse apportée
Cut, Copy, Paste icons missing
Looks like they've been removed in R2025. However, you can easily program and install your own cut/copy/paste buttons on the Qui...

18 jours il y a | 0

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Adding multiple function plots to a single figure with subplots - MATLAB
This might be what you want: Manipulators={manipulator1,manipulator2,manipulator3}; m=3;n=2; %tiling dimensions %create h...

19 jours il y a | 0

Réponse apportée
Construct voronoi diagram on a point cloud
Using the attached file and this FEX download https://www.mathworks.com/matlabcentral/fileexchange/30892-analyze-n-dimensional...

20 jours il y a | 0

Réponse apportée
How to generate orthogonal X-ray Projection, Digitally Reconstructed Radiographs (DRR), from a particular CT volume
This is a popular Matlab compatible library, https://github.com/CERN/TIGRE/blob/master/Frontispiece/MATLAB_installation.md It...

21 jours il y a | 0

| A accepté

Réponse apportée
How to move a 3D volume in 6D (3 Translations and 3 Rotations)
I defined a function called "applyRigidTransform3D" in code 1 and "rigidTransform6D" in code 2 for the 6D movements It shouldn'...

24 jours il y a | 0

| A accepté

Réponse apportée
The surface I'm plotting comes out jagged and "saw teeth" like
It's a very coarsely sampled surface. There's not really any more to it. You can bicubicly upsample the data if you want a smoot...

24 jours il y a | 0

| A accepté

Réponse apportée
How to draw line in viewer3d ?
You could use images.ui.graphics.Surface to create a very thin cylinder, could you not?

30 jours il y a | 0

| A accepté

Réponse apportée
Inverse problem, Overdetermined, Nonlinear
You would use fsolve or, if you want specific constraints on the unknowns, e.g., bounds, you would use lsqnonlin. You could al...

environ un mois il y a | 0

Réponse apportée
2D-3D image registration - COMPLETE 6D ESTIMATION
I haven't read the paper, but I don't see how the proposed method would ever work as you describe it. 6D motion simply does not ...

environ un mois il y a | 0

Réponse apportée
Fitting to exp plus a constant
It looks like the fit was successful, but the model function is overparametrized, so there is no specific value for a (or c) tha...

environ un mois il y a | 0

Réponse apportée
Showing the value on the x-axis as a legend the moment the curve deviates from the x-axis
Something like this, perhaps: Hlines=plot(1:5, max(0,-2:2), 1:5, max(0,-1:3)); axis padded h=arrayfun(@addIt,Hlines); leg=l...

environ un mois il y a | 0

Réponse apportée
camera intrinsics calibration produces wild out-of-range principalPoint
You haven't provided data with which to repeat the calibration, so one can only guess. But if reconstruction error is low, the p...

environ un mois il y a | 0

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