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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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  • Most Accepted 2021
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Respondida
Why does this code give error?
As you can see, VecteurDirectionnel and S are the wrong sizes for matrix multiplication, whos VecteurDirectionnel S % Array ...

alrededor de 8 horas hace | 0

Respondida
DNN training 3D Parameters
The parameters you mention experimenting with do not include all the training options (see below for a more complete list). You ...

5 días hace | 0

Respondida
Store arrays of different size in each for loop itertaion
b=sparse(sz(:,1)'); kkkk = nonzeros( (A(:)>=b & A(:)<=b+100).*(1:numel(A))' );

5 días hace | 0

Enviada


Block transposition, permutation, and reshaping of arrays
Analogues for transpose(), reshape(), and permute() but where sub-blocks of the array are treated as scalar elements.

5 días hace | 4 descargas |

Pregunta


Why is it that Line objects can be instances of two different classes? How can I use findobj to detect only chart primitives?
Using findobj, I have ended up with two arrays of Line graphics handles, load handleArrays hL hD However, the arrays do ...

5 días hace | 0 respuestas | 1

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respuestas

Respondida
How to modify subplots to create a new subplots?
close all H(1)=openfig('pac4.fig'); ax1=flip(findobj(H(1),'Type','axes')); H(2)=openfig('pvc4.fig'); ax2=flip(findobj(H(2)...

5 días hace | 0

| aceptada

Respondida
Store arrays of different size in each for loop itertaion
kkk=cell(4,1); for i=1:4 kkkk{i} = find(A>=sz(i,1) & A<=sz(i,1)+100); end kkkk=vertcat(kkkk{:});

5 días hace | 0

| aceptada

Respondida
Using imageDatastore to load Input image and get output as predicted image
and predict an image as output of the model. Labels are text scalar that are assigned to an image in a classification problem....

8 días hace | 0

Respondida
Most time-efficient conversion from logical matrix to fixed-point vector
n = 1e6; % number of fi objects m = 16; % number of bits of each fi object tic; A = randi([0,1], [n m], "logical"); t1 = toc...

10 días hace | 1

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Respondida
Tracking the variation of the distance between optimization variable and the optimal solution over the iteration time
function x_opt = locao2(h, C, BS_positions, alpha,x0) objective = @(x) -calculatePDF(x(1), x(2), h, C, BS_positions, alph...

12 días hace | 0

Respondida
Help with getting drawnow to show one point at a time
The loop variable i is not being used, Perhaps you meant to have, for i = 1:numel(roll) plotOrientation(op, roll(i), ...

14 días hace | 0

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Respondida
The sufficient and necessary conditon of fmincon funciton can find out the global optimal solution but not some other local optimal solutions
fmincon has no awareness of, and so does not consider, the function's global properties, like whether it is convex or not. It on...

14 días hace | 0

| aceptada

Respondida
What is the finite nature of MATLAB?
It is not the finite nature of Matlab, but rather the finite nature of an FFT. You are not transforming a true sinc function bec...

14 días hace | 1

| aceptada

Respondida
Overloading subsrefs for class and using it from another method in the same class
As an alternative to subsref or set/get, you could look at RedefinesDot, but I find that the newer, modular indexing can have su...

14 días hace | 0

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Respondida
Overloading subsrefs for class and using it from another method in the same class
No, subsref is only called by indexing operations invoked outside the classdef. This design decision was to avoid triggering rec...

14 días hace | 0

Respondida
Passing Structure through fminsearch
If p is the unknown parameter vector, it must be passed separately from the fixed parameters, S.PHI=... S.TAU=... [p...

15 días hace | 0

| aceptada

Enviada


ezplane
Plot an arbitrary 3D plane given its equation.

15 días hace | 1 descarga |

Respondida
multiple 3D plane plotting
Using this FEX download, https://www.mathworks.com/matlabcentral/fileexchange/161351-ezplane planedip = 30; planeazim = 12...

15 días hace | 0

| aceptada

Respondida
Why do i get "Error using vertcat Dimensions of arrays being concatenated are not consistent" while using fmincon to do nonlinear optimization
However, as i searched, it seems appear for error in matrix calculation. there really isnt matrix calcualtion in my codes Certa...

16 días hace | 1

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Respondida
Is it possible to make a video play through of points showing yaw, pitch, and roll values?
Yes, you can use VideoWriter.

16 días hace | 0

Respondida
Volume of union and volume of intersection of convex hulls?
Use intersectionHull from this FEX download to find the intersection, https://www.mathworks.com/matlabcentral/fileexchange/3089...

16 días hace | 0

Respondida
How can I define a custom loss function using trainnet?
If you have multichannel output, the loss function will give you an SSIM per channel, e..g, loss = @(Y,targets) 1-ssim(Y,target...

18 días hace | 0

Respondida
MATLAB code of intersection
f=@(z) z(:,1:2)./z(:,3); t=(0:2:30)'; e=ones(size(t)); D=[cosd(t), sind(t), 0*e]; L1=cross(e*[0 0 1], D); L2=cross(e*...

18 días hace | 1

Respondida
Constructing a 3D matrix out of single column coordinate data with a corresponding value
Let's call your Nx4 matrix XYZV. xyzv=num2cell(sortrows(XYZV,[3,2,1]) ,1); [I,J,K,V] =deal(xyzv{:}); I=findgroups(I); J=...

19 días hace | 0

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Respondida
Constructing a 3D matrix out of single column coordinate data with a corresponding value
If you are trying to query velocity values at arbitrary 3D locations, do not use a 3D array. Instead, use scatteredInterpolant o...

19 días hace | 0

Respondida
How to close a figure made in one function, from a different function
How do I define ax in function B so that I can close Plot A You don't. You create ax in function A (it is obtained from the pl...

19 días hace | 0

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Enviada


Grids of tiled chart layouts
A tool for simplifying the creation of nested tiled layouts

19 días hace | 5 descargas |

Respondida
Merging files based on location similarity use polyshape and overlaps
The variable naming in your posted code doesn't reflect the terminology in your text explanation, making it hard to interpret. T...

20 días hace | 0

| aceptada

Respondida
Multiple ylabels for tiledlayout
One approach would be to create a 2x1 tiledlayout where inside each tile you nest another tiledlayout of dimension 2x6. You can ...

21 días hace | 0

Respondida
lsqnonlin (lsqcurvefit , fmincon) does not change the variables in an optimization process to find the best fit
Consider the various recommendations at, https://www.mathworks.com/help/optim/ug/optimizing-a-simulation-or-ordinary-differenti...

21 días hace | 1

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