Community Profile # Bruno Luong

Last seen: Today 2009 以来アクティブ

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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...

1日 前 | 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

4日 前 | 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...

5日 前 | 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.

6日 前 | 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...

6日 前 | 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...

7日 前 | 0

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...

7日 前 | 1 件の回答 | 0

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How 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 ...

8日 前 | 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)-...

8日 前 | 1

Vectorization: incompatible sizes of arrays
Simpler one liner O(:,2) = P(randi(end,n_o,end),2) + repelem(P(:,2),n_o) / 2;

10日 前 | 1

How to set the parent of the subplot in a neat way?
ax = subplot(1,2,2,'Parent',fig1)

10日 前 | 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;

10日 前 | 0

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

10日 前 | 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)

10日 前 | 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...

11日 前 | 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...

12日 前 | 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)

12日 前 | 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,...

12日 前 | 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

12日 前 | 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.

13日 前 | 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...

13日 前 | 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,...

14日 前 | 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...

14日 前 | 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...

14日 前 | 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...

15日 前 | 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...

15日 前 | 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; ...

15日 前 | 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).

15日 前 | 1

MATLAB CODE FOR ROOT MEAN SQUARED
To my book the mean should not be removed in calculation of RMS M = rand(3,100); [rows, columns] = size(M); cal_rms = zeros(r...

15日 前 | 0

Adding members to a matrix changes other members in the matrix
It is simply the display on screen that scale the data to largest value. The data is untouched interally.

15日 前 | 0

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