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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...

etwa ein Monat 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...

etwa ein Monat vor | 0

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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...

etwa ein Monat vor | 1

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finding the value of a corresponding column in matrix
models = A(A(:,1)==40,2)

etwa ein Monat 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-...

etwa ein Monat 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...

etwa ein Monat vor | 0

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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

etwa ein Monat 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...

etwa ein Monat 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

etwa ein Monat vor | 0

Beantwortet
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...

etwa ein Monat 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...

etwa ein Monat 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})

etwa ein Monat vor | 0

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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...

etwa ein Monat vor | 0

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solving quadratic roots in matlab
Hint: You should consider applying the quadratic formula.

etwa ein Monat vor | 0

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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...

etwa ein Monat vor | 0

Beantwortet
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 ...

etwa ein Monat 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...

etwa ein Monat 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...

etwa ein Monat vor | 0

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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...

etwa ein Monat vor | 1

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Expanding a cell array in table into multiple rows
Here's a scaled-down example: T=table(1,2,3,{rand(4,3)}, {rand(4,1)}); T.Properties.VariableNames(end-1:end)=["A","B"] n=...

etwa ein Monat vor | 0

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Camera calibrator (picture capture)
Yes, for single camera calibration, it shouldn't matter whether the camera or the pattern (or both) are moving, as long as you d...

etwa ein Monat vor | 0

Beantwortet
User Defined Functions in MATLAB
prodby2_kweave19(6) function product = prodby2_kweave19(N) product = prod(1:2:N); % User inputs N, as the argument to the...

etwa ein Monat vor | 0

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Increasing lsqcurvefit/nlinfit speed
It would definitely be faster to attach the table as an external variable to an anonymous or nested function, than to freshly lo...

etwa ein Monat vor | 0

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How to interpolate one axis in a 3D data?
load dats; F=griddedInterpolant(ss); ss=F({1:139,1:48, linspace(1,9,100)});

etwa 2 Monate vor | 0

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Using lsqnonneg to determine if there exists a solution to a (generally) under-determined linear system, but error is too large to be convincing.
A better way to investigate the existence of a solution to Aeq*x=beq, x>=0 might be (as below) to find the minimum distance betw...

etwa 2 Monate vor | 0

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Using lsqnonneg to determine if there exists a solution to a (generally) under-determined linear system, but error is too large to be convincing.
There is nothing that can be inferred from the resnorm alone about the quality of the solution. 10^-3 is a very good result if t...

etwa 2 Monate vor | 0

Beantwortet
Creating multiple cylinders in different coordinates
Using cylindricalFit() from this FEX download https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools-...

etwa 2 Monate vor | 0

Beantwortet
How many workers for fmincon with UseParallel?
Is the reason to set UseParallel to true when solving a problem with fmincon that it can potentially speed up the evaluation of ...

etwa 2 Monate vor | 0

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How to find the span of a matrix in matlab?
You can use this, https://www.mathworks.com/matlabcentral/fileexchange/77437-extract-linearly-independent-subset-of-matrix-colu...

etwa 2 Monate vor | 0

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Reliably determine RAM consumption of MATLAB variables
I am looking for a reliable way to determine how much RAM is devoted to Matlab variable data at a given moment. The whos() comma...

etwa 2 Monate vor | 0 Antworten | 0

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