Bruno Luong

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1,644 total contributions since 2009

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Answered
how to count the number of occurrences of these numbers (with some conditions)
A(1,:) = [1, 2, 5, 2 , 1 , 2]; A(2,:) = [0,1,1,0,1,0]; [B,~,J] = unique(A(1,:)); N = accumarray(J(:),A(2,:)'); B = B'; ta...

3 hours ago | 0

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Answered
How to select complementary elements from a vector?
d = [33 20 4 5 6 75 8 9 0]; I = [1 3 7]; d(I) = []

3 days ago | 0

Answered
How to select complementary elements from a vector?
d = [33 20 4 5 6 75 8 9 0]; I = [1 3 7]; d(setdiff(1:end,I))

3 days ago | 0

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Answered
Matlab equivalent of rand() in C++
random4 = randi(item)-1

6 days ago | 0

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Answered
Multiple griddata calls into a single one (same grid)
For nearest/linear/cubic method you can build the matrix https://www.mathworks.com/matlabcentral/fileexchange/85939-mat-op-ex, f...

7 days ago | 0

Answered
Multiple griddata calls into a single one (same grid)
If you are ready to trade 'v4' method for something else, you can use scatteredInterpolant % example of fake data x = -3 + 6...

7 days ago | 0

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Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.
The for loop varable is lowercase L char "l" (l), not one "1" (1) for l=1:n

7 days ago | 0

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Passing structs/objects to functions
"Does the compiler realize which parts of the struct are actually needed and pass only these to the function? " MATLAB don't pa...

7 days ago | 0

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Smallest number of data type single
>> realmin('single') ans = single 1.1755e-38 >>

7 days ago | 0

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

9 days ago | 1

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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))

10 days ago | 0

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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...

10 days ago | 0

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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...

10 days 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} =...

11 days ago | 0

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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...

12 days ago | 0

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

12 days ago | 1

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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

13 days ago | 0

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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

13 days ago | 0

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

13 days 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 ...

13 days ago | 2 answers | 0

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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...

14 days ago | 0

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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...

14 days ago | 1

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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)

15 days ago | 0

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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...

15 days ago | 2

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

16 days ago | 1

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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...

16 days ago | 0

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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...

16 days ago | 1

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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...

16 days 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

16 days 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.^...

17 days ago | 0