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# Bruno Luong

959 total contributions since 2009

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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))

2 days ago | 0

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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...

3 days 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 ...

3 days 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 days 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)

13 days ago | 1

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

13 days 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...

14 days 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 ...

15 days ago | 1

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

16 days 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,:)

16 days ago | 1

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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...

17 days ago | 0

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

22 days 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 >>...

22 days ago | 2 answers | 0

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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(...

24 days ago | 2

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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...

26 days ago | 0

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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...

26 days ago | 0

How to genetate random number under constraint

26 days ago | 0

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

27 days ago | 1

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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...

27 days 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.

28 days 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...

28 days 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...

29 days ago | 0

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...

29 days ago | 0

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))

29 days ago | 0

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...

29 days ago | 0

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...

1 month ago | 1

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...

1 month ago | 0

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Getting error: Maximum recursion limit of 500 reached
Don't call name your GUI "GUIDE"

1 month ago | 0

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