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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.

mehr als 5 Jahre vor | 0

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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...

mehr als 5 Jahre vor | 0

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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

mehr als 5 Jahre vor | 0

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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

mehr als 5 Jahre vor | 3

Beantwortet
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);

mehr als 5 Jahre vor | 1

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

mehr als 5 Jahre vor | 2

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

mehr als 5 Jahre vor | 1

Beantwortet
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 ...

mehr als 5 Jahre vor | 0

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

mehr als 5 Jahre vor | 0

Beantwortet
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...

mehr als 5 Jahre vor | 0

Beantwortet
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 = ...

mehr als 5 Jahre vor | 0

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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.

mehr als 5 Jahre vor | 0

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

mehr als 5 Jahre vor | 0

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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...

mehr als 5 Jahre vor | 0

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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...

mehr als 5 Jahre vor | 0

| akzeptiert

Gesendet

Set partition
List all partitions a set n elements

mehr als 5 Jahre vor | 1 Download |

4.8 / 5

Beantwortet
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....

mehr als 5 Jahre vor | 0

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

mehr als 5 Jahre vor | 0

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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...

mehr als 5 Jahre vor | 0

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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, [...

mehr als 5 Jahre vor | 0

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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')...

mehr als 5 Jahre vor | 1

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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(:); [~...

mehr als 5 Jahre vor | 0

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

mehr als 5 Jahre vor | 0

| akzeptiert

Beantwortet
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...

mehr als 5 Jahre vor | 1

Beantwortet
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 ...

mehr als 5 Jahre vor | 0

| akzeptiert

Beantwortet
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...

mehr als 5 Jahre vor | 0

Beantwortet
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') ...

mehr als 5 Jahre vor | 0

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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); ...

mehr als 5 Jahre vor | 0

Beantwortet
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 ...

mehr als 5 Jahre vor | 2

Beantwortet
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 ...

mehr als 5 Jahre vor | 0