Community Profile

photo

Bruno Luong


811 total contributions since 2009

Bruno Luong's Badges

  • Revival Level 1
  • Thankful Level 2
  • Guiding Light
  • 6 Month Streak
  • Knowledgeable Level 4
  • First Answer
  • Speed Demon
  • Solver

View details...

Contributions in
View by

Answered
How can I multiply two big matrices, avoiding out of memory?
You can process by chunk of smaller (100 here); % Generate small test data m = 100; n = 100^2; C = rand(m^2,3); % your [alph...

2 hours ago | 0

Answered
How to sort a matrix's columns by using indexes
Short answer data = data(:,indA); Long answer load lung.mat data=lung; b = data(:,end) == 1; data1 = data(b,:); data2 ...

15 hours ago | 0

Answered
Switching an array of Vectors from Cartesian to Spherical Coordinates
OK since nobody care to give you the complete commands I'll [az,el,r] = cart2sph(V(1,:),V(2,:),V(3,:)); S = [az; el; r]; % <- ...

18 hours ago | 0

Answered
Minimum and maximum values of a field in a structure array
arrayfun(@(s) min(s.f1), s)

22 hours ago | 0

| accepted

Answered
Row with means of each column in matrix
A = [A; mean(A,1)]

24 hours ago | 0

Answered
Matlab Gui Column Calculation Problems adds 48
Convert your GUI Data input using str2double, str2num etc >> str2double('0')+1 ans = 1 >> '0'+1 ans = 4...

1 day ago | 0

| accepted

Answered
Sorting specific values of one matrix into another
Why not use Connected graph component?

2 days ago | 0

Answered
How to get the longest consecutive values in a column vector and the position at which it starts
A=[0 0 0 1 0 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 1 1]' i=reshape(find(diff([0;A;0])~=0),2,[]); [lgtmax,jmax]=max(diff(i)); istart...

2 days ago | 1

| accepted

Answered
I want the code to randomize the rows and present each row for 10 times
The array B of the below has exactly 10 times each row of A in random order: m = size(A,1); B = A(mod(randperm(10*m),m)+1,:); ...

2 days ago | 0

Answered
Generate matrix that is a product of its indices
n = 5; i = (1:n)'; j = 1:n; M = i.*j - (i+j)

3 days ago | 1

Answered
permutations of a matrix
x = (1:5)'; n = size(x,1); m = 5; % size of b s = 3; % target sum(A(:)) [i,k] = ind2sub([m,n],nchoosek(1:m*n,s)); j = re...

3 days ago | 1

Answered
how do I improve this code?
x = [2 5 6 7 8]; y = [1 3 4 8 9]; z = x.*y; z(10) = 0; c = cumsum(z);

3 days ago | 1

| accepted

Answered
How to close the boundary of a surface already generated by filling the holes
Add the salt to suit your need Aorg = xlsread('Y_slice.xlsx'); gapmax = 5; % adjust to your need [m,n] = size(Aorg); A...

3 days ago | 1

Answered
simple integration calculation to find the area ?
trapz(T,V)

3 days ago | 0

| accepted

Answered
determine combination of elements in matrix
lgt = 4; % number of elements nz = 2; % number of 0s j = nchoosek(1:lgt,lgt-nz); i = repmat((1:size(j,1))',[1 size(j...

4 days ago | 0

Answered
Copy a figure to a subplot including all elements
close all fig1 = figure(1); ax = axes('parent',fig1); h=plot(ax,rand(1,10)); xlabel(ax,'x'); ylabel(ax,'y'); title(ax,'s...

4 days ago | 0

Answered
Plot of an ellipsoid
% If your principal axis are (3x1) P1, P2, P3 and half length are (scalars) h1, h2, h3 Q = [P1(:), P2(:), P3(:)]; Q = Q .* ([...

4 days ago | 0

Answered
Find the angle between two points in 3D plot.
if the 3D (x-y-z) coordinates of your two points are P1 and P2, both are (3 x 1) or (1 x 3) vectors angleradian = acos((P2(2)-P...

4 days ago | 1

| accepted

Answered
Using maximum of optimisation variable as an upper bound for another variable
Not sure what you mean by "boundary condition" (there is no such thing in all optimization frameworks as far as I know), but tak...

5 days ago | 0

Answered
Draw partial spheroid include a spheroid
The code bellow us this FEX to generate mesh points. % radius of the inner/outer spherical parts r1 = 1; r2 = 2; n = 20; %...

5 days ago | 1

| accepted

Answered
How to trim segments to fit a square
% Generate some test data, put 100 instead of 20 if you like X1=rand(20,1)*40; X2=rand(20,1)*40; Y1=rand(20,1)*60-10; Y2=r...

5 days ago | 1

Answered
Create volume out of two surfaces
Tetra mesh generation. Let you do exportation in STL file % Points in xy-plane nx = 100; px = linspace(1,50,nx); pyi = 5+s...

5 days ago | 0

| accepted

Answered
pairs of consecutive numbers
A=[5 3 4 1]; As=sort(A); b=diff(As)==1; pairs=As(b)'+[0 1]; notpair = setdiff(A,p(:))

5 days ago | 1

Answered
How can I rotate and reflect subplots as a group?
x = rand(5,9); y = rand(5,9); c = rand(5,9); close all % Normal figure for h=1:9 [m,n] = ind2sub([3 3],h); ...

5 days ago | 0

Answered
how to add all 2d matrices in a 4D matrix???
sum(sum(A,3),4) or sum(A(:,:,:),3)

5 days ago | 0

| accepted

Answered
Calculation of unknown values of two equations without Symbolic Math toolbox
C = [1 1; -3 -2] \ [29; -70]

6 days ago | 0

| accepted

Answered
Multiplying 3D matrices
There is no stock function (what a MATRIX LABORATORY doesn't have such feature?), but here it is MTIMESX

6 days ago | 0

| accepted

Answered
How to round up components of a matrix to 1
>> A=[0.818655843258541 0.381356605388963 0.286089112378312 -0.0340005479718328 0.0773489731425248 -0.0465565535336793 -0.0390...

6 days ago | 0

| accepted

Answered
random order of elements in array meeting some conditions
Dynamic programming rpermc() %% save the rest in rpermc.m if needed function r = rpermc() while true r = rpc([], 20:5...

6 days ago | 0

| accepted

Load more