Matt J

Last seen: Today | Attivo dal 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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loading and training an existing network.
previous = load("savednet","net","layers"); net = trainNetwork(data,clabels,previous.net,options);

circa 16 ore fa | 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...

circa 20 ore fa | 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).

circa 23 ore fa | 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 ...

1 giorno fa | 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...

2 giorni fa | 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...

3 giorni fa | 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...

5 giorni fa | 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 ...

5 giorni fa | 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...

5 giorni fa | 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...

9 giorni fa | 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...

10 giorni fa | 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...

12 giorni fa | 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...

14 giorni fa | 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...

15 giorni fa | 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? ...

15 giorni fa | 2

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Moving window percentile computation using Conv
See ordfilt2.

15 giorni fa | 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...

20 giorni fa | 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...

22 giorni fa | 1

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

24 giorni fa | 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...

24 giorni fa | 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...

24 giorni fa | 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...

26 giorni fa | 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...

27 giorni fa | 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...

27 giorni fa | 0

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Domanda

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...

28 giorni fa | 1 risposta | 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 ...

28 giorni fa | 0

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

circa un mese fa | 0

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Slice of a 3D plot and projection of that function in a plane.
[x,y,yhalf]=deal(linspace(-2,2,100)); yhalf(y<0)=nan; Z = exp(-( x.^2 + y.^2')); figure, mesh(x,yhalf,Z,'FaceAlpha',1); ...

circa un mese fa | 0

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Why imregtform registration fails on similar images
Perhaps as follows, load Images g=@(z) entropyfilt(z); f=@(z) z.*(z>=1.5); im=f(g(im)); ref=f(g(ref)); ov=imref2d(size(i...

circa un mese fa | 0

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How to numerically evaluate this singular integral in integral2?
As demonstrated in the comment above, the integral is theoretically non-convergent unless c>=norm([10/a,10/b]). Here is a furthe...

circa un mese fa | 1

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