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Bruno Luong


955 total contributions since 2009

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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)

5 days 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]

6 days ago | 0

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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...

7 days 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 ...

7 days ago | 1

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

9 days 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,:)

9 days 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...

10 days ago | 0

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

15 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 >>...

15 days 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(...

16 days 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...

18 days ago | 0

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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...

19 days ago | 0

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

19 days ago | 0

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

19 days ago | 1

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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...

20 days 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.

20 days 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...

21 days 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...

21 days 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...

21 days 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))

21 days 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...

22 days 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...

23 days 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...

23 days ago | 0

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

23 days ago | 0

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Answered
How to use cellstr() without losing whitespace character?
Pay attention to the difference between the two last commands >> c1={'1' '12' '123'} c1 = 1×3 cell array {'1'} ...

23 days ago | 1

| accepted

Answered
How to get number of occurrence in a list with gaps?
(EDIT for R2016a, not supported for strings.) % dummy test data d={'1/1/2019' '1/1/2019' '2/1/2019' '4/1/2019' '4/1/2019' ...

23 days ago | 0

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Answered
I keep getting a 'parse error' at '='
Test wth "==" if (y==0)

24 days ago | 0

| accepted

Question


Regular expression to match "="
In try to find a simple pattern p to match a single '=' but ignore '==' in a string So I want regexp('a = b', p) to return 3 ...

24 days ago | 1 answer | 0

1

answer

Answered
Creating vectors with components
r=[3 2 7 5 2] r(1:min(5,end)).^2.' or r(1:min(5,end)).'.^2

24 days ago | 0

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