Matt J

Last seen: Today | Attivo dal 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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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...

circa 24 ore fa | 0

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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, ...

1 giorno fa | 0

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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": ...

3 giorni fa | 0

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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...

3 giorni fa | 0

Domanda

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...

4 giorni fa | 0 risposte | 2

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Inviato

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

4 giorni fa | 1 download |

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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...

4 giorni fa | 0

Domanda

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...

4 giorni fa | 0 risposte | 0

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Domanda

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.....

5 giorni fa | 1 risposta | 0

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

6 giorni fa | 1

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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...

7 giorni fa | 1

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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...

7 giorni fa | 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...

9 giorni fa | 0

Domanda

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...

9 giorni fa | 1 risposta | 0

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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...

11 giorni fa | 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...

12 giorni fa | 0

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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...

13 giorni fa | 0

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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...

14 giorni fa | 0

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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'...

17 giorni fa | 0

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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...

18 giorni fa | 0

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

23 giorni fa | 0

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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...

23 giorni fa | 0

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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 ...

23 giorni fa | 0

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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...

24 giorni fa | 0

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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...

25 giorni fa | 0

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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...

25 giorni fa | 0

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How can you save a 1 by 3 array in each position of a 4D array?
I would like to only have one 4D array, with each coordinate housing a 1x3 with all 3 data points needed. Is this possible? You...

26 giorni fa | 1

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How to fit a set of data where one of the fitting parameters decays exponentially?
Why not just replace Γ_cav in your model equation by a parametrized exponential, e.g., Γ_cav=a*exp(b*x) where a and b are ne...

26 giorni fa | 0

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Is image normalization performed when using "trainnet" for semantic segmentation training?
If your network has an imageInputLayer with the Normalization parameter set to do so, https://www.mathworks.com/help/deeplearni...

28 giorni fa | 0

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The calibrator app says the patterns are "too similar" even if they are not
Your cam2 images are of poor quality. Corner detection done in isolation fails pretty badly for some of them (see below). Did yo...

29 giorni fa | 0

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