# Bruno Luong

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**Content Feed**

How to compute cholesky to all slice of a tensor?

For real semi definite matrices, you can take a look at https://www.mathworks.com/matlabcentral/fileexchange/37515-mmx Unfortun...

circa 8 ore ago | 0

how to find the nearest value?

A=[ 1 2 3 4 5 6] B=[6.1 5.1 4.1 3.1 2.1 1.1] position_A=[10 20 30 40 50 60] loc = interp1(A,1:length(A),B,'nearest'...

5 giorni ago | 0

| accepted

I have matrix A and I need to find (e^(At)) where t is the sampling time. How to find that? Also what is the difference between exp(A) and expm(A)?

Math notation e^(At) is computed in MATLAB with expm(A*t) or equivalently expm(A)^t

6 giorni ago | 0

When the error comes, how to return a flag but not stop the process

You might learn about try / catch

6 giorni ago | 0

| accepted

Generate all possible combinations summing up to a given number

You can use this file exchange https://www.mathworks.com/matlabcentral/fileexchange/17818-all-permutations-of-integers-with-sum...

6 giorni ago | 0

Speed up comparing two arrays and write into new array

For simplification I use numerical data for Colors_Res/Assoc_Colors adatp tou your data type clear % Dummy test data coordInd...

7 giorni ago | 0

| accepted

How to strrep only certain strings

x = {'e-.00085';'8.5e-4'} regexprep(x, '^e', '')

8 giorni ago | 0

| accepted

MatlabR2019b standalone sharing

You need to have MATLAB compiler and they need to install the MCR.

15 giorni ago | 0

how to kill a process from Matlab

I don't know if it is matter but I always use PID to kill a process, not directly the image name. Here is my code function Kill...

15 giorni ago | 0

| accepted

Determine Camber and Thickness of a Airfoil - Given the xy coordinates

If you can tolerate some finite precision, you migh discretize the interior as b&w image, look for the skeleton https://www.mat...

22 giorni ago | 0

Problem in using scatteredInterpolant

Use nearest method F = scatteredInterpolant(..., 'nearest')

22 giorni ago | 0

| accepted

package matlab app without reveling source code

"Is there a way to package and install a MATLAB app in a way that the contents are not exposed?" In R2021b the compiler (MCC) i...

23 giorni ago | 1

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How to get the smallest value in submatrices

B=randi(9,10,2) [m,n] = size(B); k = 5; if mod(m,k) error('m must divisible by k'); end minsub = min(reshape(B,[m/k ...

24 giorni ago | 0

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extract roll pitch yaw rotation angles from 3D transform

See if you can find the formula your are looking for https://www.geometrictools.com/Documentation/EulerAngles.pdf

25 giorni ago | 0

R2021b: The Run Section tool in the Editor has been removed

It's still there

30 giorni ago | 0

| accepted

is it possible to know if an alert dialog box has opened in app designer app?(testing purposes)

Check out function ishandle

circa un mese ago | 0

| accepted

Question

Restriction of functions run under parfeval

I just see parfeval is available for R2021b allowing to run parallel function (in background) even without the parallel toolbox,...

circa un mese ago | 1 answer | 1

### 1

answercommand to read all current pressed keyboard keys

This File Exchange works well for me Hebirobotics No toolbox is required and no need to open a figure() to catch the keypressed...

circa 2 mesi ago | 1

Error using uitable in a figure, not uifigure

Sorry there is no workaround.

circa 2 mesi ago | 0

Is version 2021a compatible with windows 10 home (version 21h1)?

Yes, it's my config at home.

2 mesi ago | 0

| accepted

Is there an efficient way to write a piecewise function ?

tempfun = @(x) interp1([0 T], A([1:end end]), x, 'previous'); temp = tempfun(whatever_query_t);

2 mesi ago | 0

Why does the speed of histcounts vary so much?

It's just an assumption but histcounts probably use binary search on finite edge values. The large last edge probably penalizes ...

2 mesi ago | 1

I have a complete undirected graph with labeled edge. is there any toolbox to apply TSP in such graph.

There are several submissions of TSP in file exchanges or if you have optimization toolbox https://www.mathworks.com/help/optim...

2 mesi ago | 0

How to find a vector multiple times in an array?

A = [1 3 4]; %x,y,z-coordinates - vector B = [2 3 4; 1 3 4; 5 5 6; 3 4 6; 1 3 4]; %array % which row match find(ismember(B,...

3 mesi ago | 1

Could anyone help me how to generate the matrix in the following manner as described below

hi=repelem((1:5)',100*(1:5)); r=ceil(rand(size(hi)).*hi)

3 mesi ago | 0

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Looking for a faster way of finding the first element larger than a given number in a sorted array

You might try k = discretize(r,b); if b(k) == r k = k+1; end

3 mesi ago | 0

How to calculate permutation powers

M= [ 1 2 3 4 5 6 7 8 9 10; 3 6 8 1 2 4 5 7 10 9] S=s...

3 mesi ago | 0

| accepted

Applying vectorization techniques to speedup the performance of dividing a 3D matrix by a 2D matrix

If you have C compilers the fatest methods are perhaps mmx and MultipleQR avaikable on FEX https://www.mathworks.com/matlabcent...

3 mesi ago | 1

Can I pass arguments to a @callbackFcn?

% Assuming operation,mode are defined % operation = ... % mode = ... configureCallback(s,"terminator",@(s,t) readSerialData(s...

3 mesi ago | 1