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# Bruno Luong

##### Last seen: Today
963 total contributions since 2009

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Distance bewteen 2 cylinders in 3D
Compute the distances between 2 cylinders in 3D as well as the closest points

Question

select cameratoolbar by axes
When using standard zoom/pan/rotate3D we can disable the axes that would not under the interaction with user by setAllowAxesZoo...

3 meses ago | 0 answers | 0

### 0

Modular arithmetic for encryption
"1/2" is integer (let us call it "a") so that a*2 = 1 mod 29 This can be obtained by GCD function >> [~,a]=gcd(2,29) a = ...

3 meses ago | 1

| accepted

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

4 meses ago | 1

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

4 meses ago | 1

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))

4 meses ago | 0

| accepted

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...

4 meses ago | 0

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 ...

4 meses ago | 0

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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...

4 meses ago | 0

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)

4 meses ago | 1

| accepted

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

4 meses ago | 0

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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...

4 meses ago | 0

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 ...

4 meses ago | 1

| accepted

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

4 meses ago | 0

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,:)

4 meses ago | 1

| accepted

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...

5 meses ago | 0

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

5 meses 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 >>...

5 meses ago | 2 answers | 0

### 2

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(...

5 meses ago | 2

| accepted

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...

5 meses ago | 0

| accepted

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...

5 meses ago | 0

How to genetate random number under constraint

5 meses ago | 0

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

5 meses ago | 1

| accepted

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...

5 meses ago | 0

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.

5 meses ago | 0

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...

5 meses ago | 0

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...

5 meses ago | 0