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Bruno Luong


961 total contributions since 2009

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Answered
Bug with conv2
The answer is correct. May be you expect the result with sliding sum with unflip kernel which is of course wrong.

22 dagar ago | 1

Answered
How to replace for loop with vectorization?
[iii,jj]=ndgrid(ii,1:size(res,2)); v=accumarray([iii(:) jj(:)], res(:))

29 dagar ago | 1

Answered
Generate a random matrix without repeating any value in row and column.
A=mod((0:3)+(0:3)',4)+1; R=A(randperm(end),randperm(end))

ungefär en månad ago | 0

| accepted

Answered
Getting back the solution to Ax=b after reordering A
This is correct: clc clear close all A=[4 1 2 0.5 2;1 0.5 0 0 0;2 0 3 0 0;0.5 0 0 5/8 0;2 0 0 0 16]; % P_amd=amd(A); P_amd...

ungefär en månad ago | 0

Answered
how can i generate the random numbers for specific probabilites
v = [ 0, 15, 25, 35, 45, 20]; % values P = [0.01, 0.15, 0.20, 0.50, 0.12, 0.02]; % the correspond probability c ...

ungefär en månad ago | 0

| accepted

Answered
combination and their sum
A = [4 2; 5 7; 3 1] m = size(A,1); b = dec2bin(0:2^m-1,m)-'0'; C = A((1:m)+m*b).' Result (each column is a co...

ungefär en månad ago | 0

Answered
How to calculate determinant of matrices without loop?
a(:,1).*b(:,2)-a(:,2).*b(:,1)-a(:,1).*b(:,3)+a(:,3).*b(:,1)+a(:,2).*b(:,3)-a(:,3).*b(:,2)

ungefär en månad ago | 1

| accepted

Answered
Equality constraint in quadratic programming
Yes, il looks right to me. EDIT: No Q(3,1) must be 0 Q=[2 1 0; 1 4 0 ; 0 0 6]

ungefär en månad ago | 0

| accepted

Answered
Find matching points from two coordinate systems
Look for the literature of image registration. For simple rotation/scaling/translation you can use Matt J's submission For mo...

ungefär en månad ago | 0

Answered
How vectorize this operation
n=10 m=3 x=rand(n,1) y=rand(m,1) % your method z = nan(length(x),1);% Just some fake data to define the size of z. could ...

ungefär en månad ago | 1

| accepted

Answered
Solve Overdetermined Linear System
For overdetermined system the "\" returns least-square solution, meaning it doesn't solve exactly your system, but returnes the ...

ungefär 2 månader ago | 0

Answered
How to remove duplicates in matrix with condition
X = [1 10;2 20;3 30;3 31;3 32]; Xs=sortrows(X); [~,I]=unique(Xs(:,1),'last'); XResult = Xs(I,:)

ungefär 2 månader ago | 1

| accepted

Answered
How to taker power of a permutaion matrix
You have 2 ways to compute it, from the permutation itself, or using the permutation matrix then raise a power of it. % Generat...

ungefär 2 månader ago | 0

| accepted

Answered
How to design a Toeplitz matrix with negative lower triangle elements and zero main diagonal elements
toeplitz(0:-1:-5,0:5)

ungefär 2 månader ago | 1

| accepted

Answered
How to define a covariance matrix that is positive semi definite?
L=randn(3); sigma=L'*L

ungefär 2 månader ago | 0

Question


path of a mfile not on search path
When an mfile is not on the search path or current path and when user types the name, MATLAB find it and issues a suggestion >>...

ungefär 2 månader ago | 2 answers | 0

2

answers

Answered
How to generate a random data vector that follows a constraint
This will generate uniform distribution (within to polytope) N = 10; Etotal = 0; E = -log(rand(N+1,1)); E = E(1:N,:)./sum(...

ungefär 2 månader ago | 2

| accepted

Answered
Increasing Java Heap Memory of target machine so that EXE runs on target machine with MCR
According to my test, the stand alone app uses the sames amount of java heap memory than your MATLAB preferences. To set the a...

ungefär 2 månader ago | 0

| accepted

Answered
Model of a crowd on concert venue or how to distribute random points according to the 2D window distribution
Torsten's rejection might bias the distribution. One of the better approach is to repell the points when they are close to each...

ungefär 2 månader ago | 0

Answered
How to genetate random number under constraint
Similar question has been answered in this thread

ungefär 2 månader ago | 0

Answered
How can I evenly distribute Points inside of a triangle?
Use mesh generator like MESH2D

ungefär 2 månader ago | 1

| accepted

Answered
What code to make figure window fullscreen with subplot?
Check out This thread hope it's not obsolete. If you run on Windows WindowAPI (Jan's reply) is the only one which makes real ful...

ungefär 2 månader ago | 0

Answered
could anyone help me to calculate the euclidean distance for the matrix.
Hi Christtine, very good initiative. I think at least 90% of use-case would be p=2.

ungefär 2 månader ago | 0

Answered
What is the different between "null" command and "svd" command
Beside the trivial must do "reading the doc" you can just type edit null to see how NULL call SVD and keeps the singular vecto...

ungefär 2 månader ago | 0

Answered
Is this for-loop vectorizable?
I don't think sequential search can be vectorizable. You might improve a bit of the search by implementing dichotomy seach rath...

ungefär 2 månader ago | 0

Answered
How to draw random number from a conditional distribution
Your problem is not well defined, there are many Y that can meet such requirement (if you guys think it is impossible beside a s...

ungefär 2 månader ago | 0

Answered
How do i write a code which can calculate the cross production of two vectors?
If A and B are 5 x 1 null([a;b]) returns a (5 x 3), 3 vectors in R^5 basis of NULL(SPAN(a,b))

ungefär 2 månader ago | 0

Answered
Does inpolygon work for latitudes and longitudes on the surface of the earth?
A polygon in lat/lon will NOT map to a "polygon" on the sphere. A "polygon" on the sphere composed by edges that are grand circl...

ungefär 2 månader ago | 0

Answered
Format number in the same format as disp
>> x=logspace(1,3,10) x = 1.0e+03 * 0.0100 0.0167 0.0278 0.0464 0.0774 0.1292 0.2154 0.3594...

ungefär 2 månader ago | 1

Answered
submitWithConfiguration not working in matlab R2019b
The problem is in the statement parts = parts(conf); In MATLAB 2019B, you cannot use the same name of variable and function, b...

ungefär 2 månader ago | 1

| accepted

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