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Bruno Luong


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Answered
How to remove redundant elements in a sparse matrix?
E = triu(E);

1 giorno ago | 1

Answered
Please help me vectorize my loop to construct query vector from sample points
xs=cumsum(ceil(10*rand(1,10))) t=pi; p=cumsum([0 ceil(diff(xs)/t)]); xq=interp1(p,xs,0:p(end))

2 giorni ago | 0

| accepted

Answered
Non-convex shape as a collisionBox for robot path planning
The MATLAB probably use GJK algorithm that requires convex shape. You should split the object in sum of convex. I can recommend...

3 giorni ago | 0

Answered
Fast implementation of max-plus matrix multiplication
function C = mp_prod(A,B) m=size(A,1); n=size(B,2); AA=reshape(A,m,1,[]); BB=reshape(B.',1,n,[]); C=max(AA+BB,[],3); tic/t...

3 giorni ago | 2

Answered
Preallocating cells with unknown output size
If the size is not known, a good way is the to grow the preallocation array exponentially. Rather than the assigment X{i,j} =...

4 giorni ago | 0

| accepted

Answered
Size mismatch error on dimension 2: expected 1, but actual size is 3 (Matlab Coder)
Size of ones(SimCoreIn(k).Ns,SimCoreIn(k).Np) = 102 x 3 So (102 x 1).*(102 x 3) gives (102 x 3) right. Right but cod...

5 giorni ago | 0

| accepted

Answered
Why the sparse pattern of a sparse matrix changed
The mex probably creates a non-valid sparse matrix, use spok to check validity

5 giorni ago | 1

| accepted

Answered
continuous piecewise linear approximation of data set
see if this can help you https://www.mathworks.com/matlabcentral/fileexchange/25872-free-knot-spline-approximation

6 giorni ago | 0

Answered
App does not execute properly unless in debug mode [R2020b]
May be you should add drawnow so as things get refresed app.run.Enable='off' drawnow

6 giorni ago | 0

Answered
Calling script from a function is recommended?
Inconvenience: MATLAB coder cannot work on script inside function

6 giorni ago | 0

Question


Calling script from a function is recommended?
Now and then I call script from a function, the purspose is often initialize some constant values that are shared by across the ...

6 giorni ago | 2 answers | 0

2

answers

Answered
How to speed up this for loop containing kronecker product?
Yesterday I profile your code and the majority of time is eaten by H = K_D*K_D' - K_S*K_S'; not by Kronecker. The question is...

7 giorni ago | 0

Answered
svds(X,r) and svd(X,'econ') generating different singular vectors for large complex matrix X ??
The singular value (eigen) decomposition SVD/SVDS is not unique, vectors is up to scaling, (values is up to order for eigen valu...

7 giorni ago | 1

| accepted

Answered
How to find the first element in ascending numbers that repeat?
A = [1 2 3 4 0 1 0 1 0 1 0 1 2 3 4 0 1 0 1 0 1 1 2 3 4] b = find(A(1:end-1)==1 & diff(A)>0)

8 giorni ago | 0

Answered
Calculating a matrix with a specific form
There might be a better mehod, at least more geometric, than linear system solving. I understand you want to find m (3 x 1) suc...

8 giorni ago | 2

Answered
How to select complementary elements from a vector?
>> d(~ismember(d,I)) ans = 2 5 6 8 9 0

8 giorni ago | 0

Answered
Vectorization of Weighted Minkowski Distance
[n,m] = size(X); % do not use length Xi = reshape(X,[n,1,m]); Xj = reshape(X,[1,n,m]); tt = reshape(theta,[1,1,m]); Mat2 = s...

8 giorni ago | 0

| accepted

Answered
How to find the first number, ignore subsequent until a greater number repeats.
A = [ 0 3 0 3 0 3 0 3 0 4 0 4 0 4 0 4 0 5 0 5 0 5 0 5 0 5 0 3 0 3 0 3]: b = find(A==3); c = diff(b); b([1 find(c>c(1),1,'firs...

9 giorni ago | 1

| accepted

Answered
Assignment of variables by comma separated lists
Use deal >> A = struct('number', cell(1, 5)); >> A A = 1×5 struct array with fields: number >> n=1:5; >> c...

9 giorni ago | 0

Answered
High level question: use Matlab Compiler to integrate a function.m into C++ code
You need Compiler SDK to build shaed library Compiler alone can compile only to standalone app

9 giorni ago | 1

Answered
Mesh plot of the function sqrt(y-x^2)
Here is the surface in meshgrid form s = -1:0.01:1; y = 0:0.1:9; [S, Y] = meshgrid(s,y); X = S.*sqrt(Y); Z = sqrt(max(Y-X.^...

9 giorni ago | 0

Answered
Force constant slope in linear regression
% find intercept such that % y ~= givenslope*x + intercept % in the least squares sense intercept = mean(y - givenslope*x)

10 giorni ago | 0

Answered
Find random solutions of a system of inequalities
For small dimensions, you might use existing tools in FEX to enumerate the vertexes of the polytopes. If the domain is non boun...

11 giorni ago | 1

Answered
How do we change the maximum number of parallel cores without a visual interface?
flow.com/questions/25563906/how-can-i-change-numworkers-in-parallel-cluster-profile-when-matlab-starts

11 giorni ago | 1

| accepted

Answered
ranking the data in matrix and arrange them as per rank.
>> D=[1 2 3; 7 8 9; 4 5 6; 3 0 5]; E=[D sum(D')' ranks(sum(D')')] Unrecognized function or variable 'ranks'. Did you mean:...

12 giorni ago | 0

| accepted

Answered
How can I generate all possible combinations of a vector containing specific numbers in it?
J=nchoosek(1:8,3); [m,n]=size(J); I=repmat((1:m)',1,n); accumarray([I(:) J(:)],1)

13 giorni ago | 0

| accepted

Answered
3 equations 3 unknowns complex numbers
A\B

13 giorni ago | 0

| accepted

Answered
This error was detected while a MEX-file was running.
It simply means the MEX file is buggy.

13 giorni ago | 0

Answered
Why it is not possible to do array indexing directly after function that returns array?
There might be some syntax confusion that leads TMW not to do that. The issue is that the indexing and function argument both us...

13 giorni ago | 1

Question


What is the advantage of Help with web connection
It seems MATLAB help switch recently by default on "Web documentation" It kind of anoying where the doc is available locally. W...

13 giorni ago | 1 answer | 1

1

answer

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