# Bruno Luong

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**Content Feed**

Unexpected, unexplained, difference between Matrix linear index and row and column subscripts

Try to change for i=size(P,1)*size(P,2) to for i=1:size(P,1)*size(P,2) You light also learn to use debugger so such task.

2 hours ago | 1

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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...

15 hours 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 days ago | 0

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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 days ago | 0

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

You might learn about try / catch

6 days ago | 0

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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 days 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 days ago | 0

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How to strrep only certain strings

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

8 days ago | 0

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MatlabR2019b standalone sharing

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

15 days 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 days ago | 0

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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 days ago | 0

Problem in using scatteredInterpolant

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

22 days ago | 0

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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 days 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 days 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 days ago | 0

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

It's still there

1 month ago | 0

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

Check out function ishandle

1 month ago | 0

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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,...

1 month ago | 1 answer | 1

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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...

2 months ago | 1

Error using uitable in a figure, not uifigure

Sorry there is no workaround.

2 months ago | 0

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

Yes, it's my config at home.

2 months ago | 0

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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 months 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 months 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 months 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 months 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 months 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 months 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 months ago | 0

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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 months ago | 1