Bruno Luong

Last seen: Today | Con actividad desde 2009

Followers: 0 Following: 0

Estadísticas

All

Feeds

Respondida
How to flip the x axis in a 3d plot?
Do set(gca,'XDir','reverse') one the surfc command is carried out s = peaks'; subplot(1,2,1) surfc(s) xlabel('x') subplot(1...

21 minutos hace | 0

Respondida
Extracting multiple signal segments without a for loop
As you like but this code is perhaps slower than the for-loop signal = rand(1000,1); segmentOnsetIndices = [50 120 550 600 750...

alrededor de 23 horas hace | 1

| aceptada

Respondida
How to have individual numbers combine into a larger number
One way: UserIput = [1 2 3 10 11]; %% Coding X = polyval(UserIput, 16); X % Combine number clear UserIput % forget the ...

2 días hace | 0

Respondida
Problem with solve() and "Empty sym: 0-by-1".
Your equations look illposed to me for three reasons* For a given j, LHS are known (4 x 1) vector Ax*Ax*B(:,j), let's call ...

3 días hace | 0

Respondida
Efficient Vectorization of For Loop
Not tested but the sign reading tell me M = 2*B' * (A.*C);

4 días hace | 1

| aceptada

Respondida
uicontrol doesn't work in Matlab 2023a
The button position you give is way off push the button outside the universe. This happens with all MATLAB. figure;pauseButton=...

4 días hace | 0

| aceptada

Respondida
Finding the index k of square nilpotent matrix A
This modified version of binary search only use matrix multiplication and keep track of A^2^p, p = 0,1,2 ...The number of matrix...

4 días hace | 0

Respondida
Finding the index k of square nilpotent matrix A
I modify your original code and now it seems working: function k = nilIndex(A) [n,n]=size(A); l=0; k=n; B =A^l; while k-l>...

4 días hace | 0

Respondida
When Should Generalized eig() Solver be Used for Ordinary eig() Problems?
Actually I think eig with 2 inputs is more approprite for multiple order eigen value and the degenerate case to non trivial jord...

5 días hace | 0

| aceptada

Respondida
uniform knot vector for splines
Your knot sequence seems NOT to be suitable for interpolation. The interpolation matrix is singular. x = linspace(1,6,6); xi =...

7 días hace | 0

| aceptada

Respondida
Strange behavior with ODE45 dependent on tspan
I would divide the time interval in three parts, as the typical time scales are different during the pulse and outside the pulse...

7 días hace | 0

| aceptada

Respondida
Matrix multiplication not returning on certain matrix content (Intel)
The matrix contains many non normalized floating point numbers and operations on these numbers are very slow; >> load('C:\Users...

9 días hace | 0

Respondida
Using fmincon to solve objective function in integral form.
trapz(tspan/length(t), 2*x.^2 + 2*xd.^2) This looks wrong to me, you seem to assume t is equi distance (even in that case you s...

9 días hace | 1

| aceptada

Respondida
Lognormal distribution parameters mu and sigma
Is mu=log(mean) and sigma=log(Standard deviation)? No: https://en.wikipedia.org/wiki/Log-normal_distribution If X is log-norma...

10 días hace | 0

Respondida
Effficient Computation of Matrix Gradient
The best N = 200; % 750 gradX_1 = zeros(N,N); w = rand(N,N); AXB = rand(N,N)+1i*rand(N); A = rand(N,N)+1i*rand(N); B = ran...

10 días hace | 0

| aceptada

Respondida
Effficient Computation of Matrix Gradient
I propose this, and time testing for N = 200; N = 200; % 750 gradX_1 = zeros(N,N); w = rand(N,N); AXB = rand(N,N)+1i*rand(N)...

10 días hace | 0

Respondida
fmincon solution does not differ from initial guess if I provide gradient
To get more info turn the option 'CheckGradients' to 'on', and check the exitflag (third output) of fmincon

10 días hace | 1

| aceptada

Respondida
Function matchpairs does not work in MATLAB R2023a when I use a sparse cost matrix. Please help me out ASAP!
Your sparse matrix filled default cost wit 0 not 99. Then your expectation on that the result is identocal for different cost ma...

10 días hace | 0

Respondida
error using spline: The first input must contain unique values.
Your spline command wouldn't do what you want, since for every x you have made corresponding two y values. It is NOT a function ...

10 días hace | 0

Respondida
error using spline: The first input must contain unique values.
You did not post your spline command, my guess is you do spline(x,y) Try to remove the last (or the first value of th, then do ...

10 días hace | 0

Respondida
How to fit a sine curve with only the maximum and minimum values
piecewise (co)sine interpolation (not fitting). I don't think you have extra DOF to play with if you restrict data to be local ...

11 días hace | 1

Respondida
symmetric solutions of linear matrix equations
This is a method that use the small "original" linear system. I use pcg since it a linear solver that can accept function handle...

11 días hace | 1

Respondida
symmetric solutions of linear matrix equations
If you have tthe optimization toolbox % Generate test matrices n = 3; A = randn(n); X=rand(n); X = X+X.'; B = X*A; % Add s...

12 días hace | 0

| aceptada

Respondida
how to multiply every single element in a matrix to entire of another matrix?
x = [100,500,900,1300,1700; 120,600,1080,1560,2040; 140,700,1260,1820,2380; 160,800,1440,2080,2720; 180,900,...

12 días hace | 1

Respondida
symmetric solutions of linear matrix equations
% Generate test matrices n = 5; A = randn(n); X=rand(n); X = X+X.'; B = A*X; % Add small noise to B B = B + 1e-1*randn(siz...

13 días hace | 0

Respondida
polyfit step by step or analytics
polyfit is the mfile you can step through in debugging mode. If you call with one outout argument (non normalized) it build van...

14 días hace | 0

Respondida
Inserting 0 in sparse matrices without changing sparsity pattern?
Is it possible to tell MATLAB to not change the sparse matrix, but instead treat inserted zeros as any other value? Short answ...

14 días hace | 1

| aceptada

Respondida
How to fix my linear fit model?
Assuming you know where to split the data for left and right lines: x = [0 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 ......

14 días hace | 1

| aceptada

Respondida
How to fix my linear fit model?
This returns the piecewise linear function that is continuous at the break point. The correct break point is close to 18.6054 a...

16 días hace | 1

Respondida
strcmp gives a 0 while it should be a 1
Look more carefully: There is a 'c' before '49' in A but not in B

17 días hace | 0

| aceptada

Cargar más

Bruno Luong

Estadísticas

MATLAB Answers

MATLAB Answers

Cody

Cody

File Exchange

File Exchange

MATLAB Answers

File Exchange

File Exchange

File Exchange

File Exchange

MATLAB Answers

Feeds