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# Bruno Luong

Last seen: Today Active since 2009

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How to perform repmat function to repeat rows of a matrix
n = 2; kron(A,ones(n,1))

1 hour ago | 0

How to perform repmat function to repeat rows of a matrix
n = 2; A(kron(1:end,ones(1,n)),:)

1 hour ago | 0

How to perform repmat function to repeat rows of a matrix
n = 2; A(ceil((1:n*end)/n),:)

1 hour ago | 0

How to perform repmat function to repeat rows of a matrix
A=[1,0,0,0,1;2,0,0,0,2;3,0,0,0,3] A(repmat(1:end,2,1),:)

1 hour ago | 0

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How to perform repmat function to repeat rows of a matrix
A=[1,0,0,0,1;2,0,0,0,2;3,0,0,0,3] reshape(repmat(reshape(A,1,1,[]),2,1,1),[],size(A,2))

1 hour ago | 0

parfor and rng(1)
rdn(1) outside the parfor has no effect. from the doc: "For independent streams on the workers, use the default behavior or co...

2 hours ago | 0

Problems in running for loop on keys on container maps
keySet = {'1,1', '1,2', '1,3'}; %use cell array valueSet = {[2 3], [3 4], [9,6]}; M = containers.Map(keySet,valueSet); for p...

8 hours ago | 0

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Parfor loop classification "fix usage of indicated variable" error
LEDdetectThresh=(mean(C_data_ArrayMean(:,:,idx),1))+C_data_ArrayStd(:,:,idx); LEDdurIndx=find(C_data_ArrayMean(:,:,idx)>LEDde...

8 hours ago | 0

Vectorizing or otherwise accelerating nested loops with large multidimensional arrays
% Generate dummy data B=randi(4,10,3,5); A=rand(10,3,5); meanAmp = nan([max(B,[],'all'),size(A,2),size(A,3),size(A,3)]); f...

19 hours ago | 0

Question

Why TMW does not improve INV?
If TMW thinks the legacy algorithm behind INV applied on full square matrix (base on LU and LDT) is not accurate enough (*), why...

1 day ago | 1 answer | 0

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Modify off diagonal elements of Matrix without looping
M = 4; A = rand(M); A(1:size(A,1)+1:end) = 10, % This is how you change the diagonal of A using linear indexing

2 days ago | 0

Sharing Variables between app and matlab workspace?
Put this statement after you generate your data in the callback mydata = ... assignin('base', 'mydata')

3 days ago | 0

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Sum(sum()) with optimization variable
What about this: L = reshape(1:size(x,3),1,1,[]) b = L >= t-pt_rj & L <= t; Constraint2 = sum(sum(b.*x,3),1) <= ones(1,size(...

4 days ago | 0

Optimization: Reuse calculations from objective function in nonlinear constraints function
You can use this design pattern function preciousvalue = expensivereuse(inputs) persistent lastresult if ~isempty(lastresult)...

4 days ago | 1

How to compare values in respective columns using "ismember"
use ismember on each column separately for j=1:size(A,2) A(:,j) = ismember(A(:,j),B(:,j)); end

4 days ago | 1

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Intersection of two curves
Intersection of to things that are not comparable? why not? just avoid using it to conclude anything that matters. N = [1 2 3 4...

5 days ago | 1

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Is it possible to specify the 'order' of a smoothing spline?
See if this can helps you https://www.mathworks.com/matlabcentral/fileexchange/25872-free-knot-spline-approximation

5 days ago | 0

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Matlab Extracting X and Y coordinates
See here

5 days ago | 0

Natural Cubic Spline Interpolation
You made at least 2 mistakes: h is not computes Typo "x" instead of "X" The rest of the algorithm I didn't look at carefully ...

6 days ago | 0

Finding a propriate function to fit "U" curve
This is the best I come up with using BSFK FEX x=[0.17 0.33 0.83 1.67 2.5 3.33 5]; y=[6.62466 5.58235 4.63169 5.08213 5.4159 5...

7 days ago | 0

linprog ignores options, why?
Can you run with exitflag and output [x, fval, exitflag, output] = linprog( c, A, b, [], [], [], [], options ) and share them...

7 days ago | 1

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Why does MATLAB differentiate between strings and character array data types?
strings is introduced recently and the behavior is not the same than char array, an historic class. So they create a new class t...

7 days ago | 0

Supplying gradient for the subset of parameters
May be you could provide the gradient interface for all, but compute the subset derivative analytically and the complement by fi...

8 days ago | 1

Matrix algebra AxB=C, I want to solve for B
You can't recover the "original" B, whatever it is, your system is underdetermined (much more unknowns - 1826 - than equations -...

8 days ago | 1

How can I assign zeros to a particular value in an expression
test function test N =4; u = (1:N); v = (N:2*N-2); function ui = getu(i) if i <= 0 | i >= 4 ui = 0; else ui =...

9 days ago | 0

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How to find x value for a known y in array plot?
* x = linspace(-3,3); Assuming your data are monotonic on the neighborhood of the max y = exp(-x.^2); [maxy, imax] = max(y...

9 days ago | 0

pause() function is inaccurate
The accuracy is documented. "The accuracy of the pause function is subject to the scheduling resolution of your operating syste...

9 days ago | 1