Answered
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.

5 years ago | 0

Answered
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...

5 years ago | 0

Answered
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

5 years ago | 0

Answered
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

5 years ago | 3

Answered
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);

5 years ago | 1

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

5 years ago | 2

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

5 years ago | 1

Answered
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 ...

5 years ago | 0

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

5 years ago | 0

Answered
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...

5 years ago | 0

Answered
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 = ...

5 years ago | 0

Answered
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.

5 years ago | 0

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

5 years ago | 0

Answered
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...

5 years ago | 0

Answered
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...

5 years ago | 0

| accepted

Submitted

Set partition
List all partitions a set n elements

5 years ago | 1 download |

4.8 / 5

Answered
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....

5 years ago | 0

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

5 years ago | 0

Answered
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...

5 years ago | 0

Answered
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, [...

5 years ago | 0

Answered
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')...

5 years ago | 1

Answered
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(:); [~...

5 years ago | 0

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

5 years ago | 0

| accepted

Answered
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...

5 years ago | 1

Answered
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 ...

5 years ago | 0

| accepted

Answered
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...

5 years ago | 0

Answered
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') ...

5 years ago | 0

Answered
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); ...

5 years ago | 0

Answered
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 ...

5 years ago | 2

Answered
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 ...

5 years ago | 0