Answered
Fit ellipsoid to (x,y,z) data
Using quadricFit from, https://uk.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools-for-fitting-conics-and-q...

2 years ago | 2

Answered
How to plot the best fitted ellipse or circle?
The code below uses ellipsoidalFit() from this FEX download, https://www.mathworks.com/matlabcentral/fileexchange/87584-object-...

2 years ago | 1

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Answered
Efficiently calculating the pixels crossed by a ray bundle
I have tried to go from square pixels to circles, I'm assuming the circles are inscribed inside the square pixels? If so, I wou...

2 years ago | 0

Answered
Troubleshooting Title and Axis Label Placement in Log-Log Plot with Dual Axes in MATLAB Live Script
I've marked lines I've added changed below in comments: h = figure(); param = [0.3287,3.5103,1 0.3287,4.5491,2 ...

2 years ago | 0

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Answered
Remapping problem in order to calculate the estimate of new frame
Check wither map_x or map_y (or both) are outside the boundaries of img_n.

2 years ago | 0

Answered
Minimize multivariable function with multivariable nonlinear constraints in MATLAB
The problem is unbounded. Consider x=[ 14, pi/2, x3,0,0,x6]. Then the problem reduces to the linear program, ...

2 years ago | 0

Answered
How to represent gray scale images as affine subspaces?
One way, I suppose would be to train an affine neural network with the Deep Learning Toolbox, e.g., layers=[imageinputLayer(120...

2 years ago | 0

Answered
Show matrix is not invertible.
syms a b c d e f g h A = [a 0 0 b 0; 0 c 0 0 d; 0 0 e f 0; 0 0 0 0 g; 0 h 0 0 0]; det(A)

2 years ago | 0

Answered
How do I isolate a specific part of an image for quantitative analysis via segmentation
You could have a look at the Image Segmenter App https://www.mathworks.com/help/images/ref/imagesegmenter-app.html

2 years ago | 0

Answered
To mirror (i.e, to copy) the upper matrix to the lower half in matrices arranged in 3D
M_3D=randi(100, 4,4,3); %fake input N=size(M_3D,1); mask=triu(ones(N)); mask(1:N+1:end)=nan; M_3D=M_3D.*mask; M_3D=M...

2 years ago | 1

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Answered
Combine multiple objects to create Super Sampled representation
Here's an algebraic solution in which we model the blobs as circularly symmetric with a radial profile parametrized by cubic spl...

2 years ago | 0

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Answered
3d Plotting a decagonal pyramid
sidelength=10; height=8; %User inputs V=nsidedpoly(10,'Side',sidelength).Vertices; V(end+1,3)=-height; trisurf( dela...

2 years ago | 0

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Answered
How to compute the Volume of a 3D-model
Try lowering the alpha radius and see if it improves the result.

2 years ago | 0

Answered
A and I　are n*n matrix. I want to know the code to calculate the photo`s matrix
A=ones(2); n=length(A); N=5; Ac=cell(1,N); Ac{1}=eye(n); for i=2:N Ac{i}=A*Ac{i-1}; end Ac{N+1}=zeros(n)...

2 years ago | 1

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Answered
Plot function of two variables in 2D space
V = @(x1,x2) x1.^3 + x2.^2; fcontour(V,[0,1])

2 years ago | 0

Answered
How Do I Create a Mean Filtered Image using For Loops?
grayImg=reshape(1:49,7,7) [m,n]=size(grayImg); dm=repmat(3,1,ceil(m/3)); dm(end)=dm(end)-(sum(dm)-m); dn=repmat(3,1,ceil(...

2 years ago | 0

Answered
Solving systems of equations graphically and finding where they cross.
x_intersect=fzero(@(x) 2*x-3*sin(x)+5 ,[-20,+20])

2 years ago | 0

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Answered
Goodness of fit parameters seem to be incorrect in Curve Fitter App with Exponential 2 term
RSquared is showing as 1, although my hand calculation suggests 0.99993 Not mine. See below. If I had to guess, you copied the ...

2 years ago | 1

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Answered
Use of fmincon with nonlcon inside a parfor loop
Move the steps inside the loop to its own function doOptimization(). You can nest functions there, as in in the example below. ...

2 years ago | 0

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Answered
Trying to find chekerboard points, not returning any points with detectCheckerboardPoints
You can download pgonCorners, https://www.mathworks.com/matlabcentral/fileexchange/74181-find-vertices-in-image-of-convex-polyg...

2 years ago | 0

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Answered
Given vector with N entries, generate all combinations with K entries such that K > N, vector entries can repeat
Starting with R2023a, syms a b k=4; v=repmat( {[a,b]},1,k); result=table2array(combinations(v{:}))

2 years ago | 0

Answered
Given vector with N entries, generate all combinations with K entries such that K > N, vector entries can repeat
syms a b k=4; [C{k:-1:1}]=ndgrid([a,b]); result=reshape(cat(k+1,C{:}) ,[],k)

2 years ago | 1

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Answered
fmincon: optimize till nonlinear condition is false
Adjusting the constraints shall not be the solution for this. Instead of a hard constraint, you could add a penalty term to you...

2 years ago | 0

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fmincon: optimize till nonlinear condition is false
yes but I maybe could define a maximum stepsize which might be smaller than this intervall so the optimizer cannot accidentally ...

2 years ago | 0

Answered
access time of data in cell array vs matrix
Because extracting from cell arrays involves no new memory allocation. And because N_img=1000 is still very small.

2 years ago | 1

Answered
Poor results for neural-network based image segmentation
Maybe increase the fitting capacity of the network. Add another encoder/decoder layer and/or increase the filter size?

2 years ago | 0

Answered
Poor results for neural-network based image segmentation
I can't manually chop off the appendages via image erosion bwlalphashape from this FEX download, https://www.mathworks.com/mat...

2 years ago | 0

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Answered
How to avoid recursion in property set functions
The recursion can be avoided if all of the code leading up to the property assignment, along with the property assignment are al...

2 years ago | 0

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Answered
4D integral using integral and integral3
f = @(a, b, c, d) a+b+c+d; I = @(a, b, c) integral(@(d) f(a, b, c, d), 0, 1,'ArrayValued',1); f2=@(a, b, c) I(a,b,c)+1; I2=in...

2 years ago | 0

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Discussion

Implicit expansion for CAT()
Would it be a good thing to have implicit expansion enabled for cat(), horzcat(), vertcat()? There are often situations where I ...

2 years ago | 2