Bruno Luong

Last seen: Today | Active since 2009

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Effect of zero padding on FFT amplitude
If your (windowed) signal dies out to 0 in a smooth way then the padding with 0s changes little to the FFT spectrum, it is equiv...

2 hours ago | 0

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how can I write this in a compact form? can anyone suggest a single line code for it
n = 8; ismember(mod((1:n)-(1:n)',n),[1 n-1])

7 days ago | 1

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Hi. How I can write this formula with Matlab code?
n=10; psi=rand(1,n-2); chi = 0; for k=1:n-2 i = nchoosek(1:n-2,k); j = 1:k; l = k+1-j; il = i(:,l); ...

8 days ago | 0

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How to calculate the entropy of a portion of image as in the following formula?
Please try this A=imread('ngc6543a.jpg');; A=double(A(1:500,:,:)); A=sum(A,3); M = 11; N = 11; % Build 8-neighbor [di,...

9 days ago | 0

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How to generate random number from Bernoulli distribution?
p = 0.25 X = double(rand(1,1000) < p) histogram(X,'Normalization','pdf')

10 days ago | 0

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Interp1 is not woking
Extrapolation is notoriously unstable. So there is no surprise here. v1r = -0.01:0.00001:0 f1r = interp1(v1, f1, v1r, 'spline'...

10 days ago | 0

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all integer possibilities for equations
@Ravindra Pawar Replace eqt 2 to eqt 1 to remove one variable, you can solve it with gcd or more generally see this oldthread h...

12 days ago | 1

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how to remove noise from curves and take their derivates
I would chose spline fitting rather than polynomial (bad) or rational. Look at the shape of your data, I doubt any simple analy...

13 days ago | 0

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How to convert matrices of different sizes in a for loop into a single column vector?
... PhaseC = cell(1, nLevels); for k = 1:nLevels ... Phase = acos(subband./amp); PhaseC{k} = Phase(:); end Ph...

13 days ago | 0

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How to sort minimum value from a matrix
See matchpairs function number = 6; A = 1+10*(rand(number,2)); B = [4,8; 6,8; 8,8; 6,6.7; 6,5.4; 6,4.1]; % Calculate all dis...

13 days ago | 1

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Answered
Faster alternative to polyxpoly
I would add my own BLU_polyxpoly which derived from here https://fr.mathworks.com/matlabcentral/fileexchange/27673-2d-polygon-ed...

15 days ago | 0

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Where is the code of a Matlab Object?
which comm.LinearEqualizer If it's mfile contains source code then you can see it.

15 days ago | 0

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How can I find the filter bandwidth of Savitzky-Golay filtering?
sa-golay filter is just non-causal FIR filter, where the coefficients are computed as following order=3;framelength=11; B = sg...

16 days ago | 1

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Multiplication of matrix and first dimension of a 3-D array without for loops
A = rand(4,4); B = rand(4,10,5); % orginal code for i = 1:10 for j = 1:5 C(:,i,j) = A(:,:)*B(:,i,j); end en...

16 days ago | 1

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How to represent [airfoil] coordinates as a polynomial
You could use the free-knot spline xy = [0 0 0.00369000000000000 0.0134500000000000 0.0170200000000000 0.028070000000...

17 days ago | 0

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Set unintentionally triggers uitable callback
I use uistyle to change the background, AFAIK it doesn't trigger callback unlike set()

17 days ago | 0

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How to create all possible matrices of zeros and ones without having more than one '1' in the same column?
m = 2; n = 3; c = cell(1,n); [c{:}] = ndgrid(1:m); i = reshape(cat(n+1,c{:}),[],n); [j,k] = meshgrid(1:n,1:size(i,1)); X...

17 days ago | 1

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How to generate code in MATLAB for randomly oriented short fibers?
See if this FEX can help you

17 days ago | 0

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How to simplify the for loop for 3D matrix?
load('A.mat'); load('s1.mat'); load('s2.mat'); [m,n,p] = size(s1); % s = [reshape(s1, [m,1,n,p]), reshape(s2, [m,1,n,p]...

18 days ago | 0

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is Matlab code a lot faster than Excel formulas?
Impossible to answer with such fuzzy question; the time depends on your hardware, your matlab version, your licences to acess to...

18 days ago | 1

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generate two variable from distribution without same result
Warranty never repeated pairs lA = 0; uA = 5; % lower upper bound of A lB = -4; uB = 4; % and B n = 50; % ...

18 days ago | 0

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How to adjust a curve fit such that it goes through a specific point
Add blue point as additional data point and associate it a strong weight to the rest (see Weights of options)

19 days ago | 0

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Fast way of computing all possible products of n matrices
The more I try my idea, the more Matt's solution seem amazing to me. Here is an algorithm that that build a set of product of a...

20 days ago | 1

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Why is pause function so inaccurate on Windows?
The reason is that Windows task scheduler resolution is the order of 15 ms in some recent versions. I create some C mex and cal...

23 days ago | 1

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parpool sorting out the default number of workers
I'm a little bit lost in the default number of workers when parpool() is invoked. My PC is standalone with Intel Processor and W...

24 days ago | 1 answer | 0

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What is the efficient way to loop though a multidimensional array in matlab?
The inner most loop should be the fist index, the outer most loop last index. Since MATLAB arranges data with first-dimension v...

24 days ago | 2

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parfor unable to classify, why?
Can someone explain why the ind2sub first statement triggers the error, but the second works fine? m = 2; n = 3; mycell = cel...

25 days ago | 1 answer | 0

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The proper way to sample 3 normally or lognormal distributed variables added up to 1
This will generate 3 random variables positives and sum to 1, with mean 8/10, 1/10, 1/10: nu=[8 1 1]; B=arrayfun(@(n) ones(1,n...

27 days ago | 0

Answered
How does matlab get the combinations that meet certain conditions in the matrix
You don't need MATLAB at all. From 2A1 = A2 A1 + A2, We divide by A1, and factor A2 on rhs to get 2 = A2*(1+1/A1) Meaning 2...

2 months ago | 1

Answered
How to vectorize this piece of code and why doesn't e come out to be zero though it must come out to be zero because u and b are equal?
Not tested but this for i=1:K for h=1:M ae(h,i)=exp(j*2*pi*(h-1)*d*sind(b(i))); %%%%% ae end for p=1:N ...

2 months ago | 0

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