Respondida
Much slower valid convolution using complementary size of kernels.
I would suggest to do specific conv with MEX programing. Not sure the chance to beat MATLAB though.

más de 5 años hace | 0

Respondida
Is there any method to accelerate many small matrix and vector's "mldivide" (4*4)?
I have submitted fast method FEX file MultipleQRSolver (C-compiler required) that can carried out the job in 1.5 second, 15 time...

más de 5 años hace | 0

Respondida
How to create an N-ary array
N=3 K=5 [~,A] = ismember(dec2base(0:N^K-1,N),['0':'9' 'A':'Z']); A = A-1

más de 5 años hace | 0

Respondida
How to a='10101111' convert array b=[1,0,1,0,1,1,1,1]
>> a='10101111' a = '10101111' >> a-'0' ans = 1 0 1 0 1 1 1 1

más de 5 años hace | 3

Respondida
How to average along all permutations of a 4D array?
A=randn(10,10,10,10); p=num2cell(perms(1:4),2) B=cellfun(@(p) permute(A,p), p, 'unif', 0); B=mean(cat(5,B{:}),5);

más de 5 años hace | 1

Respondida
set order of elseif
prefered_order = 'xzy'; b = [x y z]; % logical conditions (in if/elseif) code_to_be_exec = { @xcode, @ycode, @zcode }; % cod...

más de 5 años hace | 2

Respondida
Creating a non-square diagonal matrix
B = diag(A(:)); B(94037,1) = 0;

más de 5 años hace | 1

Respondida
Generating matrix with ones and zeros
Look at KRON >> kron(eye(4),ones(1,3)) ans = 1 1 1 0 0 0 0 0 0 0 0 0 ...

más de 5 años hace | 0

Respondida
Quadratic Spline Interpolation Code
My toolbox provide any order (1D) spline, including quadratic https://www.mathworks.com/matlabcentral/fileexchange/25872-free-k...

más de 5 años hace | 0

Respondida
is this repr.m redundant to existing standard approach?
A decend tool https://www.mathworks.com/matlabcentral/fileexchange/29457-serialize-deserialize A true matlab serialization is...

más de 5 años hace | 0

Respondida
3 equations 4 unknowns
>> M=[0 1 6; 4 0 4; 0 1 0]; >> [X,K]=eig(M); >> k=1./diag(K); % select 3rd eigen vector for example >> X(:,3) ans = ...

más de 5 años hace | 0

Respondida
Whats the difference between the two statements
The second creates 2-row matrix. The first creates 2-column matrix, since it make a transpose after reshape.

más de 5 años hace | 0

Respondida
Alternative to blkdiag and mat2cell functions
[I,J] = ndgrid(1:Nb,1:Nc); C = accumarray([I(:),J(:)+(I(:)-1)*Nc],A(:));

más de 5 años hace | 0

Respondida
Alternative to blkdiag and mat2cell functions
What about about a simple for-loop [Nb,Nc] = size(A); C = zeros(Nb,Nb*Nc); for r=1:Nb C(r,(r-1)*Nc+(1:Nc)) = A(r,:); en...

más de 5 años hace | 0

Respondida
Inexplicable different execution speeds when filling a matrix with complex entries
I also dig deeper into this "issue" of slowness. The strange issue I discover is that when filling with real values into a comp...

más de 5 años hace | 0

| aceptada

Enviada

Set partition
List all partitions a set n elements

más de 5 años hace | 1 descarga |

4.8 / 5

Respondida
Inexplicable different execution speeds when filling a matrix with complex entries
You should preallocate M as complex M = 1i+zeros(m,n); if you intend to populate it with complex number later in the for-loop....

más de 5 años hace | 0

Respondida
Sum of selected elements in Matrix
A=rand(1000); [m,n]=size(A); G=max((1:m)',1:n); s=cumsum(accumarray(G(:),A(:)))

más de 5 años hace | 0

Respondida
Trying to simplify code to see if 3 vectors are at right angle. Unsure of outcome.
>> dot(Q-P,R-P) ans = 0 So PQ is right angle with PR, etc...

más de 5 años hace | 0

Respondida
Excluding one vector from another vector with repetition
From Alexander Gallard above comment (I agree he should open a new thread) "This method didn't work for me if my C was, say, [...

más de 5 años hace | 0

Respondida
How can I create a set from elements and combined elements?
Not sure exactly what kind of "combination" you look for, but it looks like a subset of these b=logical(dec2bin(1:2^4-1,4)-'0')...

más de 5 años hace | 1

Respondida
matrix manupulation and reading diagonally
Matrix_test = [13,10,5,2;7,14,11,6;3,8,15,12;1,4,9,16] [m,n]=size(Matrix_test); [i,j]=ndgrid(1:m,1:n); jmi = j(:)-i(:); [~...

más de 5 años hace | 0

Respondida
Point or multiple points is/are in a triangle??
tf = inpolygon(Points(:,1),Points(:,2),Triangle(:,1),Triangle(:,2))

más de 5 años hace | 0

| aceptada

Respondida
Does using Functions make your code run faster?
MATLAB makes optimization when the code is in function, it does not in script (why it's also mysterious to me, there might be th...

más de 5 años hace | 1

Respondida
How to create N+1 dimensional array by taking exterior product of 1st dimension of two N dimensional arrays?
Solution without expansion as requested sizeA = size(A); reshapeB = reshape(B,[1 size(B)]); reshapeA = reshape(A,[sizeA(1) 1 ...

más de 5 años hace | 0

| aceptada

Respondida
When is minimum p-norm solution independent of p?
The optimizers fail to initialize find the first feasible point with its gradient and return the same guess, which are identical...

más de 5 años hace | 0

Respondida
Curve fit or spline fit for a wavy function
You can use my tool https://www.mathworks.com/matlabcentral/fileexchange/25872-free-knot-spline-approximation load('RPM.mat') ...

más de 5 años hace | 0

Respondida
How to check 2D rectangle and 3D rectangular prism intersect with each other?
Quick and dirty code load('prism.mat') load('rectangle.mat') % Normalize the coordinates M = prism; minM = min(M,[],1); ...

más de 5 años hace | 0

Respondida
how to write special matrices
>> dec2bin(0:2^4-1)-'0' ans = 0 0 0 0 0 0 0 1 0 0 1 0 0 0 ...

más de 5 años hace | 2

Respondida
Finding shortest path on calculated trajectories via A*
Check out this of you nsist on using A* https://www.mathworks.com/matlabcentral/fileexchange/10922-matlabbgl Otherwise Matlab ...

más de 5 años hace | 0