# Bruno Luong

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**Content Feed**

An error in filtfilt

Don't tranpose your date if you want to filter along the long dimension sig= P01EC1(:,:);

2 dagar ago | 0

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How to simulate Poisson Distribution Process?

@Safia is you want integer with fixed sum, I propose this, and it is no longer Poisson law strictly speaking lambda=3; T=60; %...

4 dagar ago | 1

How can I call a value in side the a function which is already evaluated.

If you want to retrieve value of a variable from the parent workspace inside a function without passing it as argument onstead o...

6 dagar ago | 0

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Matlab R2022b installation is not working

Probably the best way is to contact support https://servicerequest.mathworks.com/mysr/cp_case_new1?cc=uk

9 dagar ago | 0

Free-knot spline approximation (BSFK) problem

Reference to BSFK function https://fr.mathworks.com/matlabcentral/answers/1810010-free-knot-spline-approximation-bsfk-problem H...

10 dagar ago | 0

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Bug in audioread with native option R2022b?

I has been confirmed by TMW support that is indeed a bug due to third party library they are using.

11 dagar ago | 0

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Normal random number generation

Here is an alternatve without stats tbx https://uk.mathworks.com/matlabcentral/fileexchange/23832-truncated-gaussian?s_tid=srch...

11 dagar ago | 0

Comparing large sparse matrices for differences close to machine precision

One way to compare matrices is to display norm(A-B, Inf) / norm(A, Inf) It should be at machine precision (~1e-15) of at worst...

12 dagar ago | 0

Question

Bug in audioread with native option R2022b?

The audioread command with 'native' option should return the native type of the waveform. It seems there is a bug in R2022b, wh...

12 dagar ago | 1 answer | 0

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answerHow does the mod function compensate for floating point round off?

Second version, correction under stricter condition than in the first version function r = rmod2(x, a) k = round(x/a); r = x ...

13 dagar ago | 0

How does the mod function compensate for floating point round off?

I try to replicate MATLAB mod ith this function, it seems working well for 2 examples, no warranty beside that. x=(rand(1,1e6)-...

13 dagar ago | 1

Vectorization: incompatible sizes of arrays

Simpler one liner O(:,2) = P(randi(end,n_o,end),2) + repelem(P(:,2),n_o) / 2;

14 dagar ago | 1

How to set the parent of the subplot in a neat way?

ax = subplot(1,2,2,'Parent',fig1)

14 dagar ago | 1

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Vectorization: incompatible sizes of arrays

O(:,2) = reshape(reshape(P(randi(end,n_o,end),2),n_o,[]) + reshape(P(:,2),1,[]), [],1) / 2;

15 dagar ago | 0

Can a Dictionary Key be a char?

The syntax that needs to be used is d = dictionary(char.empty(0,0,0), [])

15 dagar ago | 0

Simplest way to create a unit vector in Matlab?

if by "unit" vector you means vector where the elements are all 1s len = 9; V = ones(1,len)

15 dagar ago | 0

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Can a Dictionary Key be a char?

It looks to me that dictionary can accept both char array and string indisrtinctively as keys, as it convert to string internall...

16 dagar ago | 0

Generating a combination matrix within a certain condition

I hope it works. My output is transposed, meaning the number of columns of comb is number of sets. The maxsum is upper bound of...

17 dagar ago | 2

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How to get the same number of char as number of decimals using num2str?

input = pi str = num2str(input,16)

17 dagar ago | 0

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Is there faster ranking for matrices than double sort()?

Not sure it is faster, but on the theorical complexity it is better (single sort). A = randi(10,5,3) [~,I] = sort(A,1); [m,...

17 dagar ago | 1

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How to enable contour plot for 3D trisurf?

https://uk.mathworks.com/matlabcentral/fileexchange/38858-contour-plot-for-scattered-data

17 dagar ago | 0

Is there a Faster alternative to containers.Map function ?

In new release R2022b the dictionary is new implementation of hashing search/insertion. It looks great.

17 dagar ago | 0

Elementwise shift of two matrices

truncated matrices [~, idx_A] = min(A); [~, idx_B] = min(B); di=idx_A-idx_B; Ac=A(max(1,1+di):min(end,end+di)) Bc=B(max(1-d...

18 dagar ago | 0

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How to generate repeatable random multiple vectors with Specific Number of Values and Fixed Sum?

Just split randomly at most m times on top of randfixedsum output m=5; nvalues=3; starget=10; n=diff([0 sort(randperm(m-1,...

18 dagar ago | 1

Polyfit polynomial badly conditioned on Linux whereas on Mac no warnings

In R2022a the Vandermonde matrix V is built the condition number is aroun 1e12, and the resolution is carrired out by [p, rankV...

19 dagar ago | 2

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How to do a Fourier analysis with a mask?

Discrete Fourier transform always has unwanted artefact on finite region, due to boundary wrapping jumps, even for rectangular r...

19 dagar ago | 0

Simultaneous sortrows() for all slices of a 3D matrix?

Code applicable for n == 2 and N < 256 only: % Parameters: N = 20; n = 40; m = 2; d = 200000; % Generate an example matrix...

19 dagar ago | 1

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Simultaneous sortrows() for all slices of a 3D matrix?

Somewhat faster % Parameters: N = 20; n = 40; m = 2; d = 200000; % Generate an example matrix 'A': A = randi(N,n,m,d,'u...

20 dagar ago | 1

For loop over function handle, how to speed up the code?

If your handle A can accept a matrix as input and the calculation of A(B) is not bottleneck, you can work by chunk % N = 2^16; ...

20 dagar ago | 0

Why tic/toc reports slower times the first five iterations?

If I remember, the JIT optimizer decides to kick in when the same code is detected by execution engine to run few times (5).

20 dagar ago | 1