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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How come fsolve is exceeding evaluation limit?
I don't quite understand the physics of your problem, but I have the impression that x(3:5) are meant to be non-negative. Hence,...

ungefär 2 timmar ago | 0

Answered
ellipse fit of xy data
I think the arc is too short to get a good elliptical fit. Why not a circular fit? Qualitatively at least, it looks pretty good:...

ungefär 6 timmar ago | 0

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Why does this special case for associativity of a matrix product with a hadamard product hold true?
It is clear why this happens when n=1, i.e, when A*B is an outer product. But now for arbitrary n, the matrix product can be wri...

4 dagar ago | 1

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Answered
Private/protected properties not suggested by methods in class folder
If this is a bug or oversight, I hope it's resolved soon (or perhaps already is in a release later than 2023b) I actually think...

6 dagar ago | 0

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how to crop a binary mask to remove all black pixels while maintaining the largest area of white pixels?
result = regionprops(bwareafilt(mask,1), 'Image').Image;

7 dagar ago | 0

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I would like to introduce a new loss function.
If the context is deep learning, then you should be using trainnet, whcih allows you to specify the loss function without any ot...

7 dagar ago | 0

Answered
How to load multiple mat file in sequence without natsortfiles?
F=sort("file"+(1:14)+".mat"); F=F(randperm(end)) %Unordered file list [~,is]= sort( str2double(extract(F,digitsPattern)) ...

10 dagar ago | 0

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Can I get output data from CNN convolution layer without training?
When not training, it is better to use predict(), rather than forward(). layers = [ imageInputLayer([512 512 3],Normalization=...

11 dagar ago | 0

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How does MATLAB resolve a function handle with multiple levels of indexing
Well, ultimately I think Approach 3 is the only 'correct' one. It appears that when the indexing is one level deep (as in Approa...

11 dagar ago | 1

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Answered
Help fixing different sized plots with tiled layout
Since you use imagesc to generate the subfigures, it seems to me that you should be using axis image. tiledlayout(3,3,"TileSpac...

12 dagar ago | 1

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Answered
Solving non linear system with fsolve
R is too small compared to C to have any effect numerically, so the equation is basically C*T=f. I'm assuming also that you mean...

14 dagar ago | 0

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How to permute the rows and columns in a sparse GPU matrix?
The permAndRebuild() function below is a reimplementaiton of the row permutation operation M(p,:) that also works on the GPU. On...

15 dagar ago | 1

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Answered
How to get correct pixel size in 2D after cut 3D voxel using obliqueslice
IMHO obliqueslice is a bit of a crude tool for slice sampling. One of the many things you can do with this FEX package, https:/...

15 dagar ago | 0

Answered
Vectorisation of a function solving two symbolic equations with two unknows and using structures
function [Intersection1,Intersection2] = intersection_cercle_test(vector_rays, point_rays, radius_circle, point_center_circle) ...

16 dagar ago | 2

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convert pixels to object coordinates
Gimbal is pointed to (pointAt) specific coordinates of a point of interest (POI). So, I can read azimuth and elevation angle of ...

16 dagar ago | 0

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Is there a function to tell if Matlab is using little-endian or big-endian on current computer?
function endianType = checkEndian() % Typecast uint16(1) to uint8 to examine the byte order byteValue = typecast(uin...

17 dagar ago | 0

Answered
I want to divide an array up into sections and add each section to its own column in a table.
Using mat2tiles from the File Exchange (download from here), example = rand(85,48); xcell=mat2tiles(example,[inf,8]); ...

17 dagar ago | 0

Answered
DL Network Designer, Sequential LSTM regression
The train() command is not applicable to networks composed with the Deep Learning Toolbox. You need to use trainnet, or its olde...

17 dagar ago | 1

Answered
How do I convert my nested for loop into a nested parfor loop?
One way: tpres3d = tpres_U + tpres_V*sqrt(-1); %36x34x8812 [a,b,c] = size(tpres3d); T0=reshape(tpres3D,[],c).'; Ttides_hfd...

17 dagar ago | 0

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How do I load and display an image stored in a separate .mat file?
If you look at, disp(image) you will see that image is a struct as the error message is telling you. What you probably meant t...

19 dagar ago | 0

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How to interpolate/extract row from essentially 1-D lookup table
The interpolated table data given to a 1D Lookup Table can have multiple columns. So just set it to backEMF as is.

20 dagar ago | 0

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What is the state structure for mixed integer ga optimization?
memoize might be a more direct way to achieve what you are pursuing.

21 dagar ago | 1

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.exe included during compiling is missing
I would guess, based on your other posts, that it was unpacked in a subfolder of ctfroot. That could have occurred if you direct...

21 dagar ago | 0

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fittting data using nonlinear optimization fminsearch
I see two things that might be a problem. First, your model equation might be reasonable for the envelope of the ACF curves you ...

22 dagar ago | 0

Question

A-version versus B-version of MATLAB
I have heard some accounts that the A-version of a certain year's Matlab release (e.g. R2023A) is intended as a beta-release whi...

22 dagar ago | 1 answer | 0

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Why the start point of boundingbox of regionprops is not integers, but offset with 0.5?
In the conventions of regionprops(), the centers of the pixels have coordinates at the natural integers. The coordinates that Bo...

24 dagar ago | 0

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How to impove multistart/lsqnonlin solution selection when difference between Fvals is too small to discern from rounding noise.
I have tried calculating the residuals using VPA arrays at 35 significant digits Do you really need to keep all 35? I imagine y...

24 dagar ago | 0

Answered
Fastest way to find the values and indices of the entries of a vector X that are closest to each entry of a matrix A.
result_idx = reshape( interp1(X,1:numel(X),A(:),'nearest','extrap') ,size(A)); result_val=abs(X(result_idx)-A);

26 dagar ago | 2

Answered
I cannot use interp2 function instead of griddata
scatteredInterpolant is supported for Code Generation as of R2024b, so if you can upgrade from R2019b, that might sove it.

27 dagar ago | 0

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Multimodal image registration: Is it possible to register an X-Ray to an MRI in Matlab?
There are no native Matlab commands to do even mono-modality 2D-3D image registration. As a first step, you would probably need...

28 dagar ago | 1

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