Matt J

Last seen: Today | Con actividad desde 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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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...

alrededor de 16 horas hace | 1

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Finding concave hull around abstract shape
ps = load('matlab_answer_example.mat').new_polyShape1; V=cell2mat(arrayfun(@(i) upsamp(polybuffer(ps,-i)),0:1:100,'UniformOut...

alrededor de 17 horas hace | 0

Pregunta

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...

1 día hace | 1 respuesta | 0

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

4 días hace | 0

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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...

4 días hace | 0

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

4 días hace | 0

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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 ...

4 días hace | 0

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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...

5 días hace | 0

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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...

5 días hace | 0

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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...

8 días hace | 0

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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 ...

8 días hace | 0

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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...

8 días hace | 1

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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...

12 días hace | 0

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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...

13 días hace | 0

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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...

15 días hace | 1

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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...

17 días hace | 0

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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...

18 días hace | 0

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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? ...

18 días hace | 2

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Moving window percentile computation using Conv
See ordfilt2.

18 días hace | 0

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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...

23 días hace | 1

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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...

25 días hace | 1

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N-dimension curve fit how to
Perhaps polyfitn will help, https://www.mathworks.com/matlabcentral/fileexchange/34765-polyfitn

26 días hace | 0

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How to speed up vectorized operations for dynamic programming
This might be a little faster. betaPZtransp=beta*PZ'; tic while err>tol && iter<=max_iter RHS = Ret + reshape(V0*bet...

27 días hace | 1

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Is there a meaningful guideline on when to use parentheses vs square brackets vs curly brackets in writing MatLab code?
General If we forget about indexing for the moment, it becomes very simple. Function calls use parentheses, and only parenthese...

27 días hace | 2

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Chasing what is wrong with 'dual-simplex-highs' in linprog
It doesn't like your super-small Aeq values. load('linprog_test.mat') Aeq(abs(Aeq)<1e-8)=0; linprogopt = optimset('Algori...

29 días hace | 1

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How to log the data in the workspace without modifying the content of the for loop?
What does "log the data" mean? Do you mean you want to store it to a file on disk, or do you want to store it in some sort of ar...

29 días hace | 0

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whether is imageInputLayer flattened?
No, an imageInputLayer does not reshape the input that it receives, as demonstrated in the following, net=dlnetwork(imageInputL...

30 días hace | 0

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Pregunta

Accessing network drives from within Matlab
I have two Windows 10 computers running Matlab 2023b on the same network. On one computer, I am able to reach a remote network d...

alrededor de 1 mes hace | 1 respuesta | 1

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How to quantify shape similarity between two vectors.
Perhaps you could use correlation-based similarity? x1 = 0:0.1:10; Y1 = gaussmf(x1,[0.8 5 ]); Y2 = gaussmf(x1,[0.8 3 ]); Y3 ...

alrededor de 1 mes hace | 0

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I need to apply constrain using least square non negative function in Matlab
Use lsqlin instead.

alrededor de 1 mes hace | 0

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