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Bruno Luong


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1.461 total contributions since 2009

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Answered
Generate a Matrix with the structure in the description
A=nchoosek(1:128,2)

37 minutos ago | 1

| accepted

Question


MEX: How to modify xml file for unsupported compiler?
Context: I download the intel oneAPI C++ compiler. The C compiler is not supported by Matlab R2020b and I try to design the xm...

alrededor de 18 horas ago | 0 answers | 0

0

answers

Answered
Avoid MCR CACHE deletion each time an executable is launched
"Now, if I launch the Filter.exe, the folder of the Init.exe in the MCR_CACHE is deleted and a folder for the Filter.exe in the ...

alrededor de 21 horas ago | 0

Answered
How to Generate Randomized Data Set with Given Mean/Median/Standard Deviation
There is infinity of random variables with the same mean/median/standard deviation Here is one that meet what you ask (three di...

1 día ago | 0

Answered
Vectorize for loop: corr2(A(:,:,i),B(:,:,i))
If you have R2020b, you mght try to vectorize with pagemtimes function (or use mtimesx from File exchange) meanA = mean(A,[1 2]...

2 días ago | 0

| accepted

Submitted


MultipleQR
Perform a bunch of QR factorization of same size matrix

3 días ago | 6 downloads |

Answered
Multiplication of tranformation matrices gives strange result
Your decription does not match with what your code is doing (your code) You take T1 on (x,y) data You take T2 on (x,y)...

8 días ago | 1

| accepted

Answered
How to find the last 1 in every row
Depending on the density of 1s, but a for-loop (remember that?) might be the fatest function BenchMax A=rand(10000)>0.5; ...

9 días ago | 0

Answered
Reshape data vector for a surf plot over a non-rectangular domain
A diamond shape is bijective mapped from/to a rectangular shape, thus meshgrid/ndgrid combined with surf are still applicable. ...

10 días ago | 1

Answered
Matrix Operation and decomposition
Just straight as-it-is syntax A^(1/2) A^(-1/2) or sqrtm(A) inv(sqrtm(A)) % sqrtm(inv(A)) Checkout https://www.mathworks.co...

10 días ago | 0

| accepted

Answered
atan2 not consisent
Your result atan2(a(77:78,2),a(77:78,3)) ans = 3.141592653589793 -3.141592653589793 Type single value a(78,2) yo...

10 días ago | 0

Answered
Determinant of a unitary matrix
Here is one way of computing determinant of a complex matrix U, based on Q-less qr n = size(U,1); d = 1; for k=1:n i = k...

10 días ago | 0

Answered
Counting consecutive negative numbers in an array
length(strfind([false v<0],[0 1])) or sum(diff([false v<0])==1)

11 días ago | 1

| accepted

Answered
Output only numbers with complex conjugate
a(ismember(a,conj(a))&imag(a)>=0)

11 días ago | 0

| accepted

Submitted


Random unitary matrix (and standard subgroup of U(n))
Generate matrix of one of these four supported types of groups: O(n), SO(n), U(n), SU(n)

11 días ago | 0 downloads |

Answered
Possible combinations for a vector
dec2base(0:3^9-1,3)-'0'

11 días ago | 0

Question


Determinant of a unitary matrix
Is there any other (better) way to compute the determinant of the unitay matrix beside det (that calls lu factorization)? >> [U...

12 días ago | 2 answers | 0

2

answers

Answered
Create Random Points in Elliptical Belt
If the two ellipse has the same aspect ratio and aligned then this is the method without rejection. n=1e4; ax=3; ay=1; rin...

12 días ago | 0

Answered
Find angle of rotation matrix in MATLAB
Yes the approach is wrong your code has plenty of bugs* you need to learn how to debug you need to pratice MATLAB onramp O...

13 días ago | 0

Answered
difference between str2num and str2double for getting a matrix
Under the hood str2num uses EVAL str2double uses SCANF, and work only on scalar. I see no reason why SCANF is more accurate t...

13 días ago | 0

| accepted

Answered
how to calculate number of unique element in array?
c =[ 1 1 1 1 1 1 2 1 2 2 2 3 2 4 2 5 2 5 3...

13 días ago | 0

Answered
What is the simplest way to map vector values of float to matrix of floats ?
The only vector of key map container supports is char vector (variable length) If your vector has fixe length say n; you could ...

13 días ago | 0

Answered
Solving a linear system equations with variables on both sides
See my answer in another thread.

13 días ago | 0

Answered
Bit wise operation of And and XOR together
Z=quad(0,1,1,0,1,0,1,1) function F10 = quad(u2,v2,w2,x2,u3,v3,w3,x3) % note: u2 and u3 not used anywhere F10=1+v2+x2+x2*v2+...

14 días ago | 0

Answered
Surface plot not displaying full data range
Cross answer

14 días ago | 0

Answered
surface plot face not showing colors corresponding to Zgrid in some areas
Here is a workaround, keep flat facecolor. You can use mean/min instead of max depending on what is relevant for you. Z=peaks(1...

14 días ago | 0

Question


LOADLIBRARY error 'CL' and LIMITS.H not found
I get this error message recently >> loadlibrary('C:\WINDOWS\system32\user32.dll', 'WinMouse.h') Error using loadlibrary Fail...

15 días ago | 0 answers | 1

0

answers

Answered
grouping indices based on how close they are
If your array is sorted >> c = mat2cell(a,1,diff(find([true diff(a)>5 true]))); c{:} ans = 11 12 13 ans = ...

15 días ago | 0

| accepted

Answered
Find first item with a certain condition and use it, instead of finding all items with that condition
Process by block, eventually you get the result after a couple of minutes p = zeros(1,100); p(1) = 3; n = 10^10; m = 1e7; ...

15 días ago | 0

Answered
how to find kshortest path or use Dijkstra algorithm for 12 plot points.
Assuming you want to find all paths from 1 to 12, using the code AllPath here, here is the 6 paths with the total distances (euc...

16 días ago | 0

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