Bruno Luong

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Faster way to create a matrix of the unique() of each row of a matrix
% Test example A=randi(4,10,5) [m,n] = size(A); As=sort(A,2); b=[true(m,1),diff(As,1,2)>0]; R=repmat((1:m)',1,n); C=cums...

alrededor de 1 hora ago | 1

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How to create 3D matrix with empty cells
cell(3,3,3) % replace 3 with 300 for you I'm still afraid you'll be soon in trouble if you ask such question about easy data cr...

alrededor de 5 horas ago | 0

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Fit coefficients are equal (to starting points) in 3000 different fits
Can you do check whereas they are identical with this command after the loop isequal(Coefficients(:,10),Coefficients(:,2999)) ...

alrededor de 12 horas ago | 0

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How to find the intersection of multiple arrays (or rows of a matrix) in a short code
Put in the cell then use comma list systax: c = {a, b, c, ...}; % or use mat2cell, num2cell depends how you store your 172 vect...

alrededor de 13 horas ago | 0

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2D Interpolation of data
You have scattered data, you should use scatteredInterpolant or similar, not interp2.

alrededor de 13 horas ago | 0

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Load an array instead of a struct with fields
Do this when loading, Container = load('Saving.mat'); Saving = Container.Saving; Check out doc of save ans struct so you won...

alrededor de 14 horas ago | 1

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scatteredInterpolant function is providing too much noise in interpolation
The problem raises from the fact that scatteredInterpolant use Delaunay triangulation, meaning that X and Y are assumed to have ...

alrededor de 16 horas ago | 1

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Without resorting to FEX/MEX, can the overhead of repeated calls to sparse() be avoided with operations on I, J, V directly?
EDIT: Here is the final code. Method used in B2 is the fatest; M = 10000; N = 10000; N_k = 100; A_k = cell(1,N_k); for k=1:...

alrededor de 20 horas ago | 0

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Does intlinprog use cuts during its Branch and Bound Algorithm?
The document CutMaxIterations: Number of passes through all cut generation methods before entering the branch-and-bound phase,...

1 día ago | 0

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Vectorized way to assign columns/rows of matrix to struct array's field
split = num2cell(matrixToAssign,1); [structArray.field] = deal(split{;});

1 día ago | 0

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What is the best smoothing procedure to calculate differentials for a large number of data points (x,y)?
The Savitzky-Golay filter (moving polynomial fit) is a good filter that preserves decendly the slope. There is a similar thread...

1 día ago | 1

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Dot indexing is not supported for variables of this type??? Parfor loop, and global variable
The global variable is not accessible by the workers, and it will return EMPTY when you are trying tp access to it. Soo if you a...

2 días ago | 0

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sum of different columns to the desired value in Matlab
A=randi([4 30],10,1); lo = [1 1 1 1]; up = [10 10 5 5]; BCDE=lo+diff(round((cumsum([0, (up-lo)],2)).*(A-sum(lo))./sum(up-lo...

3 días ago | 1

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sum of different columns to the desired value in Matlab
If you have the optimization toolbox A=randi([4 30],10,1); n = length(A); lo = [1 1 1 1]; up = [10 10 5 5]; m = length(up...

3 días ago | 1

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How to ask matlab to find mean only if there are less than 3 NaN values?
qq = [1 2 3 NaN; 1 NaN NaN NaN]; qqm = mean(qq','omitnan'); qqm(sum(isnan(qq),2)>=2) = NaN; qqm

3 días ago | 0

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Answered
Backslash does not provided the solution with the smallest 2-norm
Few other methods to get least-norm solution A = rand(3,6) b = rand(3,1) % Methode 1, Christine, recommended x = lsqminnor...

3 días ago | 1

Answered
Speeding up lsqlin to find the base of a matrix
Can you try this: A = mu-eye(size(A)); [Q,R,p] = qr(A,'vector'); n = [R(1:end-1,1:end-1)\R(1:end-1,end); -1]; n(p) = n/sum(n...

3 días ago | 1

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Trying to parallel compute a function
"or maybe MATLAB automatically does this and my function is already running in parallel?" No. But if you vectorize your funct...

4 días ago | 0

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AUC or trapz for irregular shape that intersects itself
I use data you provided on other thread (the excel is horrible to read, if you could provide the data in mat file format it's be...

4 días ago | 0

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Each PARFOR Worker Writes to the Same File
May be (I didn't test) you could write in binary file at a deterministic place: fileID = fopen('Results.bin','wb'); parfor ......

4 días ago | 0

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How do i insert one value from one array to another array
See if s is what you want or not (not clear for me) A = [1,2;2,1;1,1;1,3;3,2] B = [0.5,0.5;2,2] k = dsearchn(B,A) AA = ...

5 días ago | 0

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how to create a list of random number with a minimum difference between each number?
d=3; n = 6; m = 30; p = 100; % each row of x is a random realization x = zeros(p,n); for k=1:p [s,i] = sort(randper...

5 días ago | 0

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Answered
problems with @arrayfun on GPU
You miss understand arrayfun and auto-expension code, and do kind of horrible both that is incorrect. R1 = rand(2,5,4); R2 = ...

5 días ago | 0

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I need to repeat numbers in an array with a certain number of repetitions for each value without(repelem or repmat)
The old for-loop list_1 = [2;3;5;6]; list_2 = [1;4;3;1]; r = zeros(sum(list_2),1); start = 0; for k = 1:length(list_2) ...

5 días ago | 1

Answered
I need to repeat numbers in an array with a certain number of repetitions for each value without(repelem or repmat)
Why prefer a simple method when one can do in a complicated manner: list_1 = [2;3;5;6] list_2 = [1;4;3;1] idx=cumsum(accuma...

5 días ago | 1

Answered
How to generate a smooth derivative after fitting a curve to the data?
You have to FIT the spline, not interpolate. For example I use my own tool BSFK avalable in FEX. load Data.mat; pp = BSFK(x,y...

6 días ago | 0

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how to bound voronoi polygons
Transform the voronoi cells to polyshape object, you can then make the intersection of the region you want to use to clip (the b...

7 días ago | 0

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How can I get permutations of a vector satisfying the given condition?
There are 9918 permutations according to this code B= [0 2 0 13 0 0; 1 3 0 14 0 13; 2 4 0 15 0 14; 3 5 0 16 0 15...

7 días ago | 1

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How can I delete a row based on the value of the previous row?
If your data is sorted you could try this A = 1:0.1:10 A = uniquetol(A,2*(1-eps),'DataScale',1)

7 días ago | 0

Answered
How can I delete a row based on the value of the previous row?
This avoids deletetion which like growsing array wouls kill the performance. A=[10, 11.5, 13.3 13.5 13.7 17]; keep = false(s...

8 días ago | 1

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