Matt J

Last seen: Today | Actif depuis 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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nonlinear spline fit with unknown upper bound of interpolation domain
The upper bound is way larger than the fitted parameters at x < 6, causing an extremly large curvature at x > 6 which makes the ...

environ 3 heures il y a | 0

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Differentiating in one direction using FFT2
fft2(u) is equivalent to fft( fft(u,[],1) ,[],2), if that helps at all. Truthfully, it doesn't appear that you need to use fft2...

environ 20 heures il y a | 0

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need to vectorize efficiently calculating only certain values in the matrix multiplication A * B, using a logical array L the size of A * B
Is v much smaller than m or n? If so, one approach might be with an outer product decomposition: L=sparse(L); %if L was not pre...

1 jour il y a | 0

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shared colorbar for specific plots in tiledlayout
Using nestedLayouts from the File Exchange, https://www.mathworks.com/matlabcentral/fileexchange/161736-grids-of-tiled-chart-la...

3 jours il y a | 0

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MATLAB Optional Function Arguments
Using the arguments block is more robust, but I'm unable to find a way to make multiple inputs independently optional. The way ...

3 jours il y a | 2

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Set number of rows in output variable using indexing within for loop, add variable to new table
I would like to put the two calculated variable columns directly after the variable column in the original table. And you want ...

4 jours il y a | 0

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What happens if the termination condition is satisfied before the constraint in matlab's fmincon?
The only time fmincon will stop without satisfying the constraints (within ConstraintTolerance) is if the MaxItertions or MaxFun...

4 jours il y a | 0

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How to remove columns in very large matrices.
Use a sparse matrix, if applicable. matrix=sprand(1750000 , 2000, 1000/1750000); whos matrix tic; matrix(:,1:3:end)=[]; ...

4 jours il y a | 0

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Suppress uitable cell borders
In Excel, there are buttons to select particular spreadsheet cell borders and hide them. Is there an analogous way to suppress t...

5 jours il y a | 1 réponse | 0

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How to find the mask boundaries?
[Y,X,Z]=find(Mask); S=X+Y+Z; [~,i]=min(S); [~,j]=max(S); [Xmin,Ymin,Zmin, Xmax,Ymax,Zmax] =deal( X(i), Y(i), Z(i), X...

5 jours il y a | 0

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How to restart a new backgroundPool
delete(pool) pool = backgroundPool;

7 jours il y a | 0

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Slim code for smoothing spline fit with predefined knots, concavity and monotonicity
One path would be to obtain the matrix form for the spline interpolator, which I do in the example below using func2mat from th...

8 jours il y a | 1

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"isfield" for hidden field in optimoptions
One way: options = optimoptions(@fsolve,'JacobPattern',speye(5)); isNonDefault = ~isequal(options.JacobPattern, optimoption...

8 jours il y a | 0

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nargin of optional arugments
The function "func" has 3 input arguments, why nargin is 1? There are 5 input arguments, not 3: func(1,arg2=3,arg3=5) func...

8 jours il y a | 0

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Why is my matrix being multiplied by scientific notation?
That's the default way that double floats are displayed in the command window. It is purely a matter of display. The actual valu...

9 jours il y a | 0

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How to Simplify Passing Multiple Arguments from Structs in MATLAB Function Calls?
You can use namedargs2cell and comma-separated list expansion to pass multiple name-value pairs,e.g., function main(struct_n,st...

9 jours il y a | 0

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Check if the value for a field in a struct exists
Watch your struct() syntax, A=struct('a',[]) %field 'a' with empty matrix isempty(A.a) B=struct('a',{{}}) %field 'a' with em...

9 jours il y a | 0

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Image registration on segmented images
My question is thus : Is it possible to perform an image registration on a segmented image? You could use the segmentation to ...

9 jours il y a | 1

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Tally Instances of Negative Numbers in an Array (for loop)
We don't know the names of the variables in the .mat file. If it contains a variable named B that you are trying to load into A,...

9 jours il y a | 1

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Poor performance of trainNetwork() function as compared to train()
I have tried playing with the training parameters in the trainNetwork and this is the best I was able to set You can try using ...

11 jours il y a | 0

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How to restrict train() function to a select gpu pool?
This might work, setenv('CUDA_VISIBLE_DEVICES', '1,2'); % MATLAB indexes from 1, CUDA from 0

11 jours il y a | 0

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Alternative to ginput for finding curve intersections with unevenly spaced data in MATLAB
Use fminbnd or fzero, x=sort(rand(1,12)*5); y1=[0,1,-1*x(3:end)+3+2*x(3)]; y2=2*x-3; f=@(z) interp1(x,y1,z)-interp1(x,y2,...

11 jours il y a | 1

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Linear polyfit results don't look like they fit
Because both your x and y data have random errors, polyfit() is not going to be the best tool. I would recommend instead linear2...

13 jours il y a | 0

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fminunc step size too small
It's not clear to me whether you are are talking about the StepTolerance or the FiniteDifferenceStepSize, both of which you have...

13 jours il y a | 0

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how to update MATLAB 2024b when cannot uninstall old version
I've never heard of an "already installed" message when trying to update. At most, it may tell you to close any open instances o...

16 jours il y a | 0

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vector conversion from a vector of numbers to a vector cell of chars.
Y=[0 4 6]; X=Y+""; X={X{:}}

16 jours il y a | 0

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Help Plotting an Ellipse from X,Y data
a=3; b=2; %Major/minor ellipse radii plot(rand(1,5)); hold on; axis equal ellipse = translate( scale(nsidedpoly(1000),[a,b]...

17 jours il y a | 0

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connecting concenation layer error
Use connectLayers to make your connections programmatically or make the connections manually in the deepNetworkDesigner.

17 jours il y a | 0

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deepNetworkDesigner: autoscrolling, connection preservation, undoing, and landscaping
I am encountering several issues with deepNetworkDesigner. (1) I have a large network whose layers do not fit entirely on one s...

18 jours il y a | 1 réponse | 0

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I have an equation. I want to adjust one of the values in the equation until it hits a certain output. How do I run a loop to increment that certain value until it does this?
X=21; Y=4; P=3; increment=1; Yp=X/P; delta=ceil((Yp-Y)/increment); Y=Y+delta

19 jours il y a | 0

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Matt J

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