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Bruno Luong


905 total contributions since 2009

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Answered
how to change axis of a matix?
load('testdata.mat'); Ufun = @(X,Y,Z) X; Vfun = @(X,Y,Z) Y./(Z+200); [X,Y,Z] = ndgrid(x,y,z); U = Ufun(X,Y,Z); V = Vfun...

5 hours ago | 0

Answered
how to find rows and columns without using size
[numel(prod(A,2)) numel(prod(A,1))] % prod instead of sum for a change

13 hours ago | 0

Answered
how to find rows and columns without using size
for 2D array p=numel(A); if p==0 try r = A(1,:); n = 0; m = numel(A*zeros(0,1)); catch ...

14 hours ago | 0

Answered
how to assign the equality relationship for the elements symmetry to the diagnoal of a matrix
% random test matrix A = rand(4) % symmetrize of A by copying the lower part to upper part B = tril(A)+tril(A,-1).' for ...

17 hours ago | 0

Answered
How to add two values to a matrix each five values of that matrix in order to have a new matrix?
XY = [1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15]: r = ones(size(XY)); r(5:5:end) = 3; XYZ = repelem(XY,r) Note if ...

17 hours ago | 1

Answered
What happened to the figure toolbar in R2018b? Why is it an axes toolbar? How can I put the buttons back?
Duplicate my poste here For R2019b all the tricks found previously no longer work. I found this one does the trick set(groot,...

22 hours ago | 0

Answered
How to set disableDefaultInteractivity for all axes?
For R2019b all the tricks found previously no longer work. I found this one does the trick set(groot,'defaultAxesCreateFcn', ....

23 hours ago | 0

Answered
determine minimum from the first column values of matrix and removing the rest of the rows
[~,imin] = min(E(:,1)); G = E(imin,:)

1 day ago | 0

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Answered
selecting rows from C with associated values in D, while using A and B values as references to produce E and F matrices
A = [1 2]; B = [1 3]; C = [ 1 19 18 4 3 0 0 0 0 0 0; 1 19 2 17 6 7 5 4 3 2 0; 1 16 15 17 6 7 5 4 3 2 0; ...

1 day ago | 0

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Answered
Placing annotations at specific xy coordinates
There are several tool on File Exchange, such as this one

1 day ago | 0

Answered
C/Fortran callback to MATLAB
Not sure what you mean by "Callback". Callback to me is kind of event trigger function like an SW interruption. Anyway if you h...

1 day ago | 0

Answered
Main diagonal operations problem
Here is a method that has two advantages: without the need of Roger's FEX randfixedsum Produce matrix with rigourous uniform c...

1 day ago | 1

Answered
Huge matrix with Nchoosek
You became real "Patient" now? Good! Then run this look at the screen and wait until it stops. If your type Ctrl C or kill MATLA...

2 days ago | 0

Answered
Position of the left nearest one value in a vector
v = [0 0 1 0 0 0 1 1 1 1 0 0 1 1 1 0 0 1 0] % requirement: it must start with 0 Method 1 i0=find(v==0); i1=find(v==1); [~,lo...

2 days ago | 1

Answered
Max function working for a sample of images but not all
Sato's example code [~,idx]=max(A,[],7) No the correct call is [~,idx]=max(A,[],3) You take the max along the third dimensio...

2 days ago | 0

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Answered
kron function application but in 3d
A(:,:,1)= [1 2; 3 4]; A(:,:,2)=[5 6; 7 8] B = repelem(A,1,2,2)

3 days ago | 0

Answered
Binary floating point Representation in Matlab
To overcome the limitation of dec2bin at 52 bits A=[ 0.1900 -0.0300 -0.1300 0 0.1500 -0.0700 0.0500 0.1600 -0.2500 -0.1900]...

3 days ago | 1

Answered
How to use a 2D index to create a 3D array from a 4D array?
It's amazing you all ask the same question, it must have some competition somewhere in the world (china?) about the topic of pro...

3 days ago | 1

Answered
how can i add two matrix vertically with different column
I would do with the old well-served for-loop C={A B}; % put the list of your matrices here m=cellfun('size',C,1); n=cellfun...

3 days ago | 1

Question


deprecated javacomponent and javaframe
Starting from R2019b we are warned that javacomponent and javaframe property will be removed. This is a bad news for me (and I ...

3 days ago | 0 answers | 1

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answers

Answered
Create coordinates on a convex hull
% test data xy=rand(100,2); P=xy(convhull(xy),:); d=[0;cumsum(sqrt(sum(diff(P).^2,2)))]; xyi=interp1(d,P,linspace(0,d(end)...

3 days ago | 0

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Answered
How to leave only the elements that appear once per page?
If I understand you correctly % Test data A=rand(2,2,5)>0.7 B = logical(A.*cumprod(cat(3,ones(size(A(:,:,1))),1-A(:,:,1:end...

3 days ago | 1

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Answered
How to sum the intervals in matlab
I have no idea what is the purpose and what is the problem, juste point out you might try nv = cal.*v.'

4 days ago | 0

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Answered
Specific number of 1s in a 0s - 1s matrix
N=10; d=3; [~,c] = mink(rand(N,N-1),d,2); r = (1:N)'; c(c>=r) = c(c>=r)+1; A = accumarray([repmat(r,[d,1]),c(:)],1,[N N])...

4 days ago | 1

Answered
is it a bug?
No it's not a bug: from PLOT doc If one of X or Y is a scalar and the other is either a scalar or a vector, then the plot funct...

4 days ago | 1

Answered
Removing nested for loops for quicker time
I know totalDistance third dimension is a singleton p, the third dimension imagesList of is 3, and other dimensions of tot...

4 days ago | 0

Answered
Finding Linear regression equation
P=polyfit(x,y,1); m=P(1), b=P(2), % linefit = polyval(P,x)

4 days ago | 0

Answered
could anyone help me to calculate the euclidean distance for the matrix.
I would put as comment of Christine's vecnorm soluton, but somehow Answers rejects it. The vecnorm is slower than standard solu...

4 days ago | 0

Answered
Problem overlaying line on histogram
Your y-ccordinates "2" makes the line reduce to a single point. Try line([1, 1], ylim(gca), 'LineWidth', 2, 'Color', 'k');

4 days ago | 0

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