Matt J
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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Weird unexplainable results when fitting gaussian curve
You need bounds to regularize the problem, load data [~,g]=fit(x(:),y2(:),'gauss1'); R2=g.rsquare [~,g]=fit(x(:),y2(:),...
ein Tag vor | 1
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Write a MatLab script to plot two ellipses using the plot function
As an example, here is a way to plot an unrotated ellipse of known major/minor axis lengths a,b. a=5; b=3; %major/minor axes ...
ein Tag vor | 0
Does lsqnonlin handle a matrix objective function?
The matrix dimensions of the objective function output can be whatever you wish. It doesn't affect anything. The initialGuess c...
ein Tag vor | 1
I need to run code written for NVIDIA GPUs with at least 8gb of RAM
According to this, https://hub.docker.com/r/mathworks/matlab campus-wide licenses are "already configured for cloud use".
ein Tag vor | 0
Frage
Is there a way to compute the n-th symbolic derivative of a function where n is also symbolic?
Is there a way to compute the n-th symbolic derivative of a function, where n is also a symbolic variable? The following does no...
ein Tag vor | 1 Antwort | 0
1
AntwortGiven a taylor series of a function f, how do I get the original function f
syms x k f = symsum(x^k/factorial(k),k,0,Inf)
ein Tag vor | 0
How to obtain all permutations of multiple cell arrays?
Using this FEX download, https://www.mathworks.com/matlabcentral/fileexchange/115340-block-transposition-permutation-and-reshap...
2 Tage vor | 0
How to obtain all permutations of multiple cell arrays?
This is better because the for loop is only 6 iterations long. A={'a1'; 'a2'; 'a3'}; B={'b1'; 'b2'}; C={'c1'; 'c2'; 'c3'; 'c4...
2 Tage vor | 0
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Vectors must be the same length
i = gradient(q(:, 1),t); % Current derivative U_R = R * i; % Resistor's voltage U_L = L * gradient(i,t); ...
3 Tage vor | 1
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affine3d used for pure rotation causes translational misalignment
I don't really understand how your posted images show that something is wrong. It shows that the image has changed after the war...
3 Tage vor | 0
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Non linear fit extremely bad : what am I doing wrong ?
There are ways to derive an accurate x0 more systematically, e.g., rng('default') t = 0:0.02:10; x = t.*sin(2*pi*1*t) + 0.1*ra...
4 Tage vor | 0
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How to avoid counting elements in each row of matrix multiple times?
Xedges=linspace(Xmin,Xmax, Nbin+1); Yedges=linspace(Ymin,Ymax, Nbin+1); N=0; for i=1:height(X) deltaN = histcounts...
5 Tage vor | 0
How to put different size vectors to one matrix or mat file?
To save to a .mat file save filename d1 d2 d3 d4 To retrieve them, packaged in a struct variable, S=load('filename'); To wri...
5 Tage vor | 1
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finding the value of a corresponding column in matrix
models = A(A(:,1)==40,2)
6 Tage vor | 0
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lsqcurvefit answer upon termination?
You can use a nested OutputFcn, like in this example, https://www.mathworks.com/help/matlab/math/output-functions.html#bsgpq6q-...
7 Tage vor | 0
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Newton Raphson gives answers divided by 0
Raw Newton-Raphson is a pretty terrible method, but I assume you'll tell us you have no choice... [f,M]=preanalysis(); %Symbo...
8 Tage vor | 0
Adding elements to matrix
A=[1 2 3 4 5 6 7 8 9 10] B=[reshape(A,2,[]); zeros(1,numel(A)/2)]; B=[0,B(:)'] %the result
8 Tage vor | 1
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What does MATLAB actually do when switching precisions?
I don't know Julia, but I don't believe the binary decomposition was done correctly. Below is the way to do the binary decomposi...
8 Tage vor | 2
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lines that meet each other
You can use, https://www.mathworks.com/matlabcentral/fileexchange/93470-intersections-of-multiple-2d-lines-or-line-segments
9 Tage vor | 0
How to compute integrals on the GPU using trapz function
You cannot use trapz within gpuArray.arrayfun, but I don't think you really need it. On my computer, the following takes about 3...
10 Tage vor | 0
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augmentedImageDatastore for image segmentation
Supply the training data in numeric form: X_training = rand([224 224 3 200]) ; %Fake Y_training = rand([224 224 1 200]) ; %Fak...
10 Tage vor | 1
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Interpolation to arbitrary points on a patch plot
For example, F=scatteredInterpolant(msh_1.xy, q); interpolatedValues = F({[0.68,1.87],0:0.2:1})
10 Tage vor | 0
When eigs uses a custom function as input, it cannot compute an eigenvalue near a specified sigma
n = 10; A = randn(n); A = A + A'; E1=eigs(A,5,'sa')'; sigma = E1(2)+1; E2=eigs(A,5,sigma)'; E3 = eigs(@(x) (A-s...
11 Tage vor | 0
solving quadratic roots in matlab
Hint: You should consider applying the quadratic formula.
11 Tage vor | 0
how to create image data store? I do not have clarity regarding the arguments in ImageDataStore as studied from the website
Matlab does not understand (and neither do we) how a single "test1.tif" is supposed to specify labels for all of your images. Th...
11 Tage vor | 0
Running into issue using fsolve
There are no errors in what you've shown, but it is peculiar that you have one optimization (with fsolve) nested inside another ...
11 Tage vor | 0
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How to ask Matlab ga to continously regenerate individuals until they all satisfy user defined constraints prior to fitness evaluation
The way to handle that is to have the fitness function skip the FE modeling and return Inf (or some large penalizing value) if t...
12 Tage vor | 0
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Efficiently handling extremely large matrices (N x N) in MATLAB (e.g., N = 137 million)
Could you provide examples of using sparse matrices You give us wide latitude on what the example can be be, so here is one: A...
13 Tage vor | 0
Fast dataset manipulation in MATLAB
The implementation that you wrote first, R = [cos(theta) -sin(theta); sin(theta) cos(theta)]; bary = R' * (y - p); is alre...
13 Tage vor | 1
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