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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
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...

2 hours ago | 0

Answered
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...

1 day ago | 0

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

1 day ago | 0

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Question


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...

2 days ago | 0 answers | 0

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answers

Answered
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 ...

3 days ago | 0

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

7 days ago | 0

Answered
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); ...

7 days ago | 0

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Answered
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...

8 days ago | 0

Answered
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...

8 days ago | 1

Answered
Simply trying to find a value in the same row as my known value but in a different column.
Everything I have tried also gives me an answer of "0×1 empty double column vector," but without any value. You haven't shown...

9 days ago | 0

Answered
Poor performance of linprog in practice
There are some papers in the computational literature that show that if you recast a DP problem as LP problem you can achieve si...

10 days ago | 0

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Answered
Can we specify an "outward" direction to normal obtained from pcfitplane approach?
I doubt you can, but it shouldn't matter. If the normal is pointing the wrong way, just post-process the fit by flipping its dir...

10 days ago | 0

Answered
Out of memory when solving large system of non-linear equations (fsolve, fminunc, ...)
I have more then 50000 variables. And ideally, I still want to scale up to number of variables. This means your Jacobian matrix...

12 days ago | 1

Answered
Can I 'initialize' a handle object in such a way that isvalid(object) would return false?
One way: classdef ExampleClass < handle properties MyHandle end methods function...

13 days ago | 1

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Answered
How can I have the middle data set during the fitting process by lsqcurvefit?
Use the OutputFcn and/or the PlotFcn options, https://www.mathworks.com/help/optim/ug/lsqcurvefit.html#buuhcjo-options

15 days ago | 0

Answered
Why does the Stereo Camera Calibrator App provide different results on different MATLAB versions?
LIkely because the patterns are too similar across images, like the error message says. This would lead to ill-conditioning of t...

16 days ago | 0

Answered
Error using nlinfit (Check FunVals)
For one thing, y = interp1(t,y(:,7),x1,'spline','extrap'); % cumulative reported cases For another, some sort of bounds or con...

16 days ago | 0

Answered
Why is the jacobian function so slow for calculating jacobian matrix with many variables?
Use matlabFunction to compute the jacobian from symbolic to numerical form, so that when it comes time to use it repeatedly, it ...

16 days ago | 0

Answered
Different data processing depending on the spatial region of the points
Sure. Use inpolygon to detect in which region a given (x,y) point lies and compute the summation of mx variables accordingly.

17 days ago | 0

Answered
Binning matrix data (negative and positive decimals): mean of each 100 rows and create a new matrix
Using sepblockfun() from, https://www.mathworks.com/matlabcentral/fileexchange/48089-separable-block-wise-operations B=sepblo...

17 days ago | 1

Answered
Deep learning: predict and forward give very inconsistent result with batch normalisation
To get agreement, you need to allow the trained mean and variance to converge: numLayer = 9; numNeurons = 80; layers = featur...

18 days ago | 0

Answered
Cannot figure out how to fit a complicated custom equation.
I recommend using fminspleas, downloadable from, https://www.mathworks.com/matlabcentral/fileexchange/10093-fminspleas for th...

20 days ago | 0

Answered
How does dlgradient handle two output layers?
Along the lines of what @Catalytic said, it is hard to envision how you are trying to use dlgradient without seeing that code. A...

20 days ago | 1

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Answered
how to extract the learned features from a dlnetwork
featureSet = forward(net,trainData,'Outputs',net.Layers(181).Name);

20 days ago | 0

Answered
Is there a setting to move labels on a plot closer
You can use the axis label text object porperties to move them around, e.g., h=gca; h.XLabel.Position(end)=h.XLabel.Position(e...

21 days ago | 0

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Question


When did the syntax for linprog change
At one point, the input syntax for linprog was x=linprog(f,A,b,Aeq,beq,lb,ub,x0,options) but now (R2023b) I see that it has c...

22 days ago | 2 answers | 0

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answers

Submitted


Constrained minimum L1-norm solutions of linear equations
Finds least L1-norm solutions to linear equations C*x=d subject to linear and/or integer constraints.

22 days ago | 9 downloads |

Answered
The issue of optimization (minimization) of the average relative error between experimental and calculated data
If you download minL1lin from https://www.mathworks.com/matlabcentral/fileexchange/52795-constrained-minimum-l1-norm-solutions-...

22 days ago | 0

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Answered
How can I efficiently save and access large arrays generated in nested loops?
I used the following given method to save the data, and it produced an 11 GB file, which seems very large. The memory consumpti...

22 days ago | 0

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Answered
Why ILP Solver Switching to Branch-and-Bound?
Assuming you are using intlinprog, it will always uses the branch-and-bound algorithm at some stage of the processing (not sure...

23 days ago | 0

| accepted

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