Community Profile

photo

Bruno Luong


Last seen: Today |  Active since 2009

Statistics

All
  • 24 Month Streak
  • Thankful Level 4
  • Speed Demon
  • Solver
  • GitHub Submissions Level 1
  • Personal Best Downloads Level 4
  • Ace
  • Editor's Pick
  • First Review
  • 5-Star Galaxy Level 5
  • First Submission
  • Revival Level 1

View badges

Content Feed

View by

Answered
An annoying extrapolation problem
Because you insist on using anonymous function and ugly combined expression using scalar logical expression. The trick is no lon...

ungefär 3 timmar ago | 0

| accepted

Answered
Why is the result matrix “rho” of function corr (A, B) not a symmetric matrix?
As the doc describe, for example rho(2,1) is the correlation between X(:,2) and Y(:,1) rho(1,2) is the correlation between X(:...

ungefär 4 timmar ago | 0

Answered
How to efficiently index into memory and call functions within for loops
When you index a hybrid slide (j positive integer scalar) % x = ... % j = ... xidx = x(:,:,:,j,:,:) (here I take a 6D array ...

4 dagar ago | 0

| accepted

Answered
is there a way to perform this task w/o using loops?
You might consider store in table instead NOTE: using table would be more convenient to access data, not necessary faster p.va...

5 dagar ago | 1

Answered
How can I stabilize the matrix left division (i.e. "\")?
Try pinv, lsqminnorm it can stabilize somewhat the inversion with (near) singular matrix. Both bave a tolerance argument to tune...

6 dagar ago | 0

Answered
square matrix containing Chebyshev polynomials becomes singular when its size becomes greater than a certain value
That is exactky what I have suggested in my answer: use the Chebyschev nodes t0 = 0; tf = 4; N = 75; syms x h = chebyshevT(...

6 dagar ago | 0

Answered
square matrix containing Chebyshev polynomials becomes singular when its size becomes greater than a certain value
If you select discrete points d the Chebychev nodes see definition wiki, and not uniform, it will become well posed.

7 dagar ago | 0

Answered
interpolate a 2D map (array) of density samples and preserve the total ?
Use trapz for the integration (not sum), it should match (up to round off) with linear interpolation and interger subsamping fo...

10 dagar ago | 0

Question


xlabel/ylabel 'HorizontalAlignment' issue
I don't understand the 'HorizontalAlignment' of the text labels. It is not centered (when the figure has different size than the...

10 dagar ago | 1 answer | 2

1

answer

Answered
Coefficents of piecewise polynomial in matlab
Similar answer as here points = [1 0 -1 0 1;0 1 0 -1 0]; pp = cscvn(points) m = pp.dim; p = pp.pieces; %D = diff(poi...

10 dagar ago | 0

Answered
cscvn of a function, coefficients and breaks
This is how to use pp m = 2; n = 5; % 25 in the original question points = rand(m,n); pp = cscvn(points) m = pp.dim; p =...

10 dagar ago | 0

Answered
How to index two vectors together
There is FEX, and fast if you have compiler and compile the mex file. https://www.mathworks.com/matlabcentral/fileexchange/2985...

10 dagar ago | 0

Answered
The difference between performing the fft2 and the convolution
Use this function, it will perform the convolution using fft method rightly https://www.mathworks.com/matlabcentral/fileexchang...

10 dagar ago | 0

Answered
How can I rotate the axes' labels parallel to the orientation of the axes?
Try this (the letters of label are rotated but the aspect ratio remain constant so they can be read easily but are not look like...

10 dagar ago | 0

| accepted

Answered
Compact way to calculate the centroid of a boundary of a set of points
@Sim The area of the polygonal (A in the book) is sum(A)/2 in Jan code. So sum(A)*3 in Jan's code is equal to 6*area. They are...

11 dagar ago | 0

Answered
Mex function Implementation for nested-functions
you did not include operation.c in mex command

11 dagar ago | 2

| accepted

Answered
Strange warning how to interpret it?
Fixed with update 4 https://www.mathworks.com/support/bugreports/3114312

13 dagar ago | 1

| accepted

Answered
Compute only a few entries of a big matrix product
It will not store the result in 2D matrix but 3D array. I hope you can switch to this format of storage. x=rand(10000,10); k =...

14 dagar ago | 0

| accepted

Answered
Matrix addition only to elements equal to zero
C=B; B0 = B==0; C(B0)=A(B0);

14 dagar ago | 0

| accepted

Answered
Code gets stuck loading when I try to run it.
First look of your code shows that you do this mistake: https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays....

17 dagar ago | 0

Answered
How to efficiently calculate a weighted sum of 3 dimensional matrix through a vector in matlab
This uses matrix multiplication so it should be well optimized and fast. [m,n] = size(A, [1 2]); C = reshape(A,m*n, []) * B(:)...

17 dagar ago | 2

| accepted

Answered
Matrix inverse in objective function
The inv() is not supported by optimization expression see https://www.mathworks.com/help/optim/ug/supported-operations-on-optimi...

17 dagar ago | 0

| accepted

Answered
Find all possible combinations of numbers with a specific array length
char(dec2base(0:4^12-1,4)+('A'-'0'))

18 dagar ago | 1

Answered
Order of code execution seems weird
%% Function in app.PlotSetup function printProcess(app, message) app.StatusEditField.BackgroundColor = app.yellow; app.Status...

18 dagar ago | 1

Answered
how to use plot to draw a minor arc in matlab without calculating the angle range?
% Generate A, B, C, C is the center and A B are two points on circle r = rand(); C = randn(2,1); phi1 = 2*pi*rand; A = C + r...

19 dagar ago | 1

Answered
Multipilication of N-dimension array
D = rand(3, 3, 3); rotm1 = rand(3, 3, 2); for num=1:size(rotm1,3) for i=1:size(D,3) res(:,:,i,num)=rotm1(:,:...

19 dagar ago | 1

Answered
Why does C{1}(1) work but C(1){1} results in an invalid array index error in MATLAB?
"I would like to understand the rationale behind MATLAB's requirement for parentheses indexing to appear last in an indexing exp...

22 dagar ago | 0

Answered
How can I produce this matrix?
m=6 n=3 j=randperm(m,n-1); A=accumarray([2:n;j]',1,[n,m]); A(1,setdiff(1:end,j))=1

24 dagar ago | 1

| accepted

Answered
Implicit expansion for griddedInterpolant
You can do your own extension as showed here https://www.mathworks.com/matlabcentral/answers/2043017-bilinear-interpolation-fas...

25 dagar ago | 0

Answered
Linking Matlab Libraries to Mingw for Another C++ Program
You need https://www.mathworks.com/products/matlab-compiler-sdk.html

27 dagar ago | 0

Load more