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Bruno Luong


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Interpolating at vertices of a mesh
In theory you cannot. A function that is piecewise constant on elements is discontinuos at the vertices and you cannot speak ab...

約2時間 前 | 0

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Obtain the mean angle (circle mean of a file)
angledata_deg is your angle data in degree meanangle_deg = rad2deg(atan2(mean(sind(angledata_deg),2),mean(cosd(angledata_deg),2...

約22時間 前 | 0

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How parentheses effects multiplication with pi ?
From wikipedia "While floating-point addition and multiplication are both commutative (a + b = b + a and a × b = b × a), they a...

1日 前 | 0

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Adding zeros to matrix
% Replace this with your image Image100 = peaks(100)+10; %Centering padding in 4 sides PadImage300 = zeros(300,300,size(Ima...

1日 前 | 0

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How to create a surface with random spheres protruding?
Is this you want? x = linspace(0,1); y = linspace(0,1); [X,Y] = meshgrid(x,y); Z = zeros(size(X)); N = 30; for k=1:N ...

1日 前 | 0

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Integral calculation using matlab
Feel free to change these hyper-parameters n = 3 k = 2*pi*rand() integral(@(phi) arrayfun(@(phi) abs(integral(@(theta) exp(...

1日 前 | 0

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Combining function handles into one function handle
a = @(x) x(1)^2+x(2)^2; b = @(x) x(3)^2-x(4)^2; c = @(x) x(1)*x(4); % suppose your for-loop puts each function handle in a ...

1日 前 | 0

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I cannot find the distance between two matrices with respect to the Frobenius inner product.
Distance in frobenius scalar product: dist_AB = norm(A - B, 'fro') which is the same as this norm(A(:)-B(:),2)

1日 前 | 0

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Indexing problem with matrices
A = [3 5 9 6 ; 2 1 13 6 ; 6 8 52 4 ; 13 6 8 22 ]; GRID = [linspace(1,100,100); rand(1,100); rand(1,100)]' Code [tf,loc]=ismem...

2日 前 | 0

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Convolution of to matrices
Example t1 = 0:2; A1 = [0.25 0.5 0.25]; t2 = [0 3 6]; A2 = [0.25 0.5 0.25]; Code for convolution vector Y (t,A) (I don't kn...

2日 前 | 0

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How do I turn of thr grid of a surface but keep the edge line on?
Just serve yourself with plot3 commands [X,Y,Z] = peaks; surf(X,Y,Z,'edgecolor','none'); hold on plot3(X(1,:),Y(1,:),Z(1,:),...

2日 前 | 1

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Select points inside a polygon
Here is the code using POLYSHAPE load('Points.mat') load('polygon1_x.mat') load('polygon1_y.mat') lat = Points.lat; ...

2日 前 | 1

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Select points inside a polygon
But you already have the index in your code. here ... inon = in | on; % Combine .i...

2日 前 | 1

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How to make a matrix of zeros and ones with a specific distance between each one?
dmin1=3; n=10; A=zeros(n); A(1:dmin1:end,1:dmin1:end)=1; disp(A)

2日 前 | 0

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Extend a 20x1 structure to be a 20x10 structure
repmat(s,1,10);

3日 前 | 0

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Algorithm to extract linearly dependent columns in a matrix
Test matrix (10 x 6) with rank 4 M = rand(10,4)*rand(4,6) Automatic selection of independent columns of M [Q,R,p] = qr(M,'vec...

3日 前 | 2

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Section an array into equal rows and changing simultaneously the values of each section.
Initial data >> M=randi(10,3,4) M = 1 3 9 4 6 10 3 4 8 8 5 6 ...

3日 前 | 0

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Call vector by key
Work for me >> M=containers.Map('KeyType','double','valueType','any') M = Map with properties: Count: 0 ...

3日 前 | 0

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How I can find the index when both signals are high?
Assuming your signal are binary vectors of the same size b and r both = min(b,r); d = diff([0; both(:); 0]); upidx = find(d=...

3日 前 | 1

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Polyfit with other model
Generate test data x=linspace(0,1,100) P = [rand(1,3) 1] y=polyval(P,x) + 0.1*randn(size(x)); Fit polynomial (order n) y=P(x...

3日 前 | 0

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create multiple submatrices from a large matrix
Probably better code using logical indexing M = rand(54,7056); [m,n] = size(M); pattern = circshift([true(1,9) false(1,7)],...

3日 前 | 1

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create multiple submatrices from a large matrix
M = rand(54,7056); [m,n] = size(M); offset = 7; offset = mod(offset,16); I=(-16:8:ceil(n/8)*8+offset+8); J=-offset+(0:15)...

3日 前 | 1

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Network creation-Grid
Use MATLAB graph object

3日 前 | 0

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Is there any way to accelerate the solving of a series of large sparse positive definite linear equations "Ax=b" with same "A" and different "b"?
Two things come to my mind: Why can't you build all the b together then make a single inversion b = [b1 b2 ... bp] x = A \ b ...

3日 前 | 0

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How do i count same consecutive occurrences
Example: A=[1,1,1,1,1,2,2,2,2,3,3,3,3,2,2,2,1,1,1,1] Code d = diff([0, A==2, 0]); startidx = find(d==1) lgt = find(d==-1)-i...

3日 前 | 0

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How to split a 3d matrix into sub-3d matrices?
probably you can use mat2cell IMO splitting a matrix in cell is rarely a good idea if you want your code works decenly in spee...

3日 前 | 0

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Where has depfun gone? or How to make a dependency graph?
https://www.mathworks.com/help/matlab/matlab_prog/identify-dependencies.html https://www.mathworks.com/help/matlab/ref/matlab.c...

3日 前 | 0

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random matrix with a given number of specified elements
User inputs matsz = [3,3]; n1 = 4; % number of desired 1s, no need to specify for 0s Generate B = zeros(matsz); % + 0; B(r...

3日 前 | 1

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How to find a row of a large matrix
It seems you run old MATLAB version without auto-expansion capability. This will work for any version: row = find(ismember(X,[...

3日 前 | 0

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How can one extract this vector from a matrix?
Avg = mean(reshape(M(:,2:3)',12*2,[])); [(1:length(Avg)); Avg]'

3日 前 | 0

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