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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

2년 초과 전 | 0

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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...

2년 초과 전 | 1

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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...

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

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

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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)...

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

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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(...

2년 초과 전 | 0

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

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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 ...

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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. ...

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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...

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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{:}))

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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)

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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...

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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 ...

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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.

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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?

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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...

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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...

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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...

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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 ...

2년 초과 전 | 2

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3D hexagonal mesh grid
V=nsidedpoly(6).Vertices; [X,Z]=ndgrid(V(:,1),0:3); [Y,~]=ndgrid(V(:,2),0:3); scatter3(X(:),Y(:),Z(:)); view(-60,70) xla...

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A compact way to replace zeros with Inf in a matrix
Allso just for fun. A = [0 3 2 5 6; 1 1 4 3 2; 9 0 8 1 1; 5 9 8 2 0; 3 1 7 6 9]; A=A+1./(A~=0)-1

2년 초과 전 | 3

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How can I populate the rows of a difference matrix without using a for loop?
X=X(:); Y=Y(:); x=reshape(x,1,1,[]); y=reshape(y,1,1,[]); d=hypot( X - x , Y - y ); Diff=@(U,u) ((U(1)-u)./d(1,1,:)) ...

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Converting 3D matrix to 2D matrix image
See rgb2gray or im2gray.

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Can you help me design a Cylindrical Conical Helix
u=linspace(0,1,30); v=linspace(0,2*pi,30); [u,v]=meshgrid(u,v); x=(1-u).*(2.5+cos(v)).*cos(4.*pi.*u); y=(1-u).*(2.5+cos(v))....

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How can I adjust the space between each subplot for a 5*3 subplots setup?
n=4; %1x4 figure; t=tiledlayout(1,n,'TileSpacing','tight'); for i=1:prod(t.GridSize) nexttile imagesc(phantom(12...

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Discussion

Do Reinvent the Wheel
Are there Matlab features which intend to satisfy your needs but fail in certain critical areas, forcing you to abandon them com...

2년 초과 전 | 3

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Can you help me design a Cylindrical Conical Helix
For example, t=linspace(0,20*pi,6000); R=exp(-0.1*t); x=R.*cos(t); y=R.*sin(t); z=R.*cotd(30); plot3(x,y,z)

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