Answered
Construct a permutation matrix from two vectors
combinations, new stock function in R2023a a = [1 ; 2 ; 3]; b = [4 ; 5 ; 6]; combinations(a,b)

3 years ago | 1

Answered
How to extract diagonal elements of multidimensional array ?
N = 7; A = rand(N,N,N,N,N); p=ndims(A); N=length(A); % Method 1: generalization of cyclist's answer step = polyval(ones...

3 years ago | 0

Answered
How to avoid automatic conversion of complex to real?
Yes it works as intended, and no there is no way to disable it. This automatic conversion also affects the CPU and sometime it ...

3 years ago | 0

Answered
Is it possible to solve the problem on a permutation set with MATLAB tools?
@potato curious I have function like f(x) = 4x₁+3x₂ and constraints like 3x₁+5x₂<=20, x₁+6x₂>=30. And need to find which permuta...

3 years ago | 0

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Question

xregion yregion back/front control
I play with the new xregion command (R2023A) The red region is hide by the histogram, not sure why it is not as document exampl...

3 years ago | 1 answer | 0

1

answer

Answered
How to know interpolated points in a MATLAB plot?
% Dummy example of some curve that cross the horizontal line y=10 x = cumsum([0 rand(1,40)]); y = 12*sin(x); plot(x,y,'.-'); ...

3 years ago | 1

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Answered
minimum value optimization of matrix with constraints
Straighforward implementation, it seems more reliable than Matt's square-root parametrization. The square-root makes the gradie...

3 years ago | 0

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Answered
The most efficient way to calculate multiplication and summation of two large matrices
It is just a scaling of matrix multiplication, if you haven't recorgnize it A=rand(300,1000); B=rand(300,1000); tic C1=(A*...

3 years ago | 1

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Answered
Create random symmetric matrix with given cond number to pass it to pcg
n=10; % size of the system condtarget = 1000; % generate ransom spd matrix [Q,~]=qr(randn(n)); r = rand(n,1); r = (r-min(...

3 years ago | 0

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Answered
How to get a smooth plot by filtering the sudden variation of the data?
It recovers a big tail part of the signal. Hard to guess what should be the signal at the begining. A=readmatrix('https://www.m...

3 years ago | 0

Answered
FFT analysis with window of vibration during milling
I don't see the need of calling sgolayfilt. It is just a linear filter so it is equivalent to scale down the signal in frequency...

3 years ago | 0

Answered
natural cubic spline interpolation of y-values: how to get derivative of the spline wrt the y-values?
The derivative f wrt to y_i is the spline interpolate b_i := (0,0,...,1,0...) where 1 is at ith position, since the spline is li...

3 years ago | 0

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Answered
natural cubic spline interpolation of y-values: how to get derivative of the spline wrt the y-values?
In this thread https://fr.mathworks.com/matlabcentral/answers/1894800-how-to-remove-noise-from-curves-and-take-their-derivates?s...

3 years ago | 0

Answered
How to use isoutlier based in a part of the data?
Not sure, you are not better to describe what you want than most people; what you cann outlier seems to be point that violate th...

3 years ago | 0

Answered
Modified Akima Interpolation process
Just look at the refernce provided in the doc page A New Method of Interpolation and Smooth Curve Fitting Based on Local Proced...

3 years ago | 0

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How to get around sparse row deletion for least squares calculation
I'm nit sure why you formalize as block sparse, since it is like solving d independent linear systems of the same size, and can ...

3 years ago | 0

Question

factorization of Multivariate polynomial
Hello, I want to factorize a multivariate polynomial in a complex field. I just don't understand why the result of this simple p...

3 years ago | 2 answers | 0

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answers

Answered
what is a reasonable step tolerance for optimization algorithms if parameters are in the range [0,1]?
Your question is not clear enough. the official doc explains how it eaxctly works https://www.mathworks.com/help/optim/ug/toler...

3 years ago | 0

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Answered
Matrix multiplication gives different result than manual dot products with each column
"Does anyone know why these two expressions don't give the same answer? " Why should they? The algorithm can perform diffrent s...

3 years ago | 0

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Answered
Why do I see a drop in the last datapoint (Nyquist frequency) of the spectra derived from pwelch?
No I beg to differ the answers that have given to you. The reason is the convention of onesided spectrum. In the code computepsd...

3 years ago | 0

Answered
Why the function like (1 - cosd(x)) / cosd(x) doesn't create an vector and can't plot?
Change / to ./, the "/" is matrix left-division and does something you won't expect for vectors x=-25:0.1:25; %Grad in Bogenma...

3 years ago | 0

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Answered
Failure to load structures into an array through a loop
I copy my answer fromthis thread Usage is typically like this: cellresult = cell(1,n) for i=1:n % do something first ...

3 years ago | 0

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Answered
Finding two similar Matrix in a whole set
If you have great number of matrices (like 1000 or more) reduce the number of comparisons by computing for each matrix the min, ...

3 years ago | 1

Answered
access matlab figures by opening them with a mouse while a matlab terminal application is still running
Here is one way of calling dbcont to exit debug mode without user typing it this FEX keyboard ... wait until user do his/her s...

3 years ago | 1

Answered
Sorting random x,y spots on circularly closed line in order to calculate properly the perimeter and the area of the polygonal shape.
Formulate as TSP and solve with intlinprog as showed here

3 years ago | 1

Answered
How can i transform rad/s to hertz for graph?
omega = 2*pi*f with unit omega [rad/s] f [1/s]

3 years ago | 0

Answered
How do I uninstall an older version of MATLAB after I have installed a newer version on my Mac OSX?
No don't disactivate MATLAB, just uninstall 2019b. Activation is common for all installed versions. Many versions can be inst...

3 years ago | 2

Question

What is MCR R2022b Update 5 ?
When I try to download MCR 2022b, it appears the Update is 5 https://ssd.mathworks.com/supportfiles/downloads/R2022b/Release/5/...

3 years ago | 2 answers | 0

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Answered
R2022B Update4 is not offered
The online update for R2022b Update 4 is NOT offered by TMW. Workaround : do the offline installation. Risk: you need to unin...

3 years ago | 0

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Answered
Are there any matrix balancing/scaling function in matab for complex rectagular matrices?
Check out normalize

3 years ago | 0