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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
Derivative of a multivariate function handle
Is this what you want? syms y [1 2] g = [y(1)*cos(y(2))+y(2)*sin(y(1))-0.5]; Jfun=matlabFunction(jacobian(g,y)) Jfun(0...

1 day ago | 0

Answered
Determine if a point is inside a cube
Assuming the cube is not rotated, vertices = [ -1, -1, -1; -1, -1, 1; -1, 1, -1; -1, 1, 1; 1, -1,...

1 day ago | 0

Answered
How to use splitapply function with a grouping variable which is a cell array in my table?
groupingVar = {'A', 'X'; 'A', 'Y'; 'B', 'X'; 'B', 'Y'; 'A', 'X'; 'A', 'Y'; 'B', 'X'; 'B', 'Y'; 'A', 'X'; 'A', 'Y'}; G=findgro...

1 day ago | 0

Answered
find unique array cell with 2 field
>> findgroups(f(:,1),f(:,2)) ans = 1 1 3 2

1 day ago | 0

| accepted

Answered
Question regarding calling the destructor of a broadcast variable in parfor.
It is because you have 6 workers in your parpool. Therefore, a copy of Mage is sent to each worker, for a total of 6, during par...

1 day ago | 0

| accepted

Answered
find unique array cell with 2 field
load('matlab_f.mat') table2cell(unique(cell2table(f),'rows'))

1 day ago | 0

Answered
Problem with ploting involving function handle
Perhaps this is what you meant? N= 600; COMx_k = @(k) real(sum(1.*exp(-2*pi*1i*(k/N)*(1:N)' ),1)); %k=0:0.1:300 fplot...

1 day ago | 0

| accepted

Answered
how to change the image from axial to sagittal
imtool3D() is not a native Matlab function, but I imagine if you permute your data permute(data,[3,1,2]) so that its slices are ...

3 days ago | 0

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Answered
How to add an NVCC flag
Downgrade to Visual Studio 2019. See also, https://www.mathworks.com/matlabcentral/answers/2158705-mexcuda-can-t-find-visual-st...

3 days ago | 0

Answered
starting vector (zero vector) equals lower bounds but gets projected to non-zero vector
This behavior is specific to the interior-point algorithm. As the name suggests, an interior-point algorithm must start at an in...

4 days ago | 1

Answered
Finding concave hull around abstract shape
ps = load('matlab_answer_example.mat').new_polyShape1; tic; V=cell2mat(arrayfun(@(i) upsamp(polybuffer(ps,-i)),[0,1],'Unifor...

4 days ago | 1

Question


mexcuda() can't find Visual Studio 2022, but mex() can.
In R2024a, I encounter the following when trying to compile with mexcuda in conjunction with Visual Studio 2022. >> mexcuda -la...

5 days ago | 1 answer | 0

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answer

Answered
loading and training an existing network.
previous = load("savednet","net","layers"); net = trainNetwork(data,clabels,previous.net,options);

7 days ago | 0

| accepted

Answered
Interpolate and plot a surface in a rotated coordinated system
I'm not familiar with the FEX submission you used, but I can show how I would do it with this one, https://www.mathworks.com/ma...

7 days ago | 0

Answered
Find the indices of numbers that occur first
You won't be able to do better than a for-loop over the V(i).

7 days ago | 0

Answered
scale/normalize parameter vector for optimization
The transformation is non-differentiable, and probably is not a good idea for Optimization Toolbox optimizers which are smooth ...

7 days ago | 0

Answered
I have shifted from lsqnoneg to lsqlin because lsqnonneg does not support additional constraint is it right or wrong choice?
If your lsqlin can solve your problem, then there is usually never any reason to use lsqnonneg. lsqnonneg is for nonlinear least...

8 days ago | 0

Answered
Why is my hamming window and rectangular window values the same for sigma_omega when I make L = 21?
% Set window length L = 21 L = 21; % Generate rectangular and Hamming windows rect_window = window(@rectwin, L); hamming_w...

9 days ago | 0

| accepted

Answered
How to identify Gaussian type maxima in an image
using imregionalmax i can generate a list of candidate. I wanna check each one now. I may like to filter the one which are non s...

11 days ago | 0

Answered
transform linear inequality constraints into bound constraints for optimization solvers
Yes, a set A*y>=0 is a cone and so can equivalently be expressed as where are the so-called extreme rays of the cone and are ...

11 days ago | 0

Answered
Cannot define a cell array of custom classes in function argument validation
classdef Session < handle %SESSION Summary of this class goes here % Detailed explanation goes here properties (Acc...

11 days ago | 1

Answered
How to convert two nested for-loops to one parfor loop.
It does not seem advisable to use parfor. Everything in your code is vectorizable. However, here is what a parfor approach could...

15 days ago | 0

| accepted

Answered
Why can't we define properties on enumerations extending from built-in classes?
I don't know why. I suspect it is for the same reason why builtin indexing and concatenation no longer works when you add proper...

16 days ago | 0

| accepted

Answered
Why did CD folder; give such a goofy error message when I just forgot ()
Because cd apploc is equivalent to, cd('apploc') This is a general thing in Matlab function-calling syntax. For any functio...

18 days ago | 1

Answered
moving median with variable window
Anyway, I will be very happy for any hint how to apply robust median filter on my use case, where separate parts of signal shoud...

20 days ago | 0

Answered
moving median with variable window
x = rand(1,6) k = [2,3,3,5,3,2]; n=numel(x); J=repelem(1:n,k); I0=1:numel(J); splitMean=@(vals,G) (accumarray(G(:),vals...

21 days ago | 0

Answered
Minimum CUDA driver version which works with R2024a
The driver version you need is a function of your GPU card. Why not just install the latest one as the error message suggests? ...

21 days ago | 2

Answered
Moving window percentile computation using Conv
See ordfilt2.

21 days ago | 0

Answered
Modifying arrow length based on intersection with polygon
An alternative to Mike's approach using linexlines2D() from the File Exchange, https://www.mathworks.com/matlabcentral/fileexch...

26 days ago | 1

Answered
Should table Indexing be Faster?
I haven't profiled it, but I would bet that the following line, from @tabular/braceReference b = t.extractData(varIndices); is...

28 days ago | 1

| accepted

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