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Matrix having one row
Avoid using LENGTH Replace with for i = 1:size(x,1) ... end

5 years ago | 0

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Memory cost of multiplying sparse matrices
I guess MATLAB creates a temporary buffer of length equals to the number of rows of A when A*B is invoked. The exact detail only...

5 years ago | 0

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How can I pseudorandomize with constrains and make spesific number spread equally among the array?
Unzip this attached file, you'll get a pfile r1234.p Call it A = r1234 You'll get the result as specified.

5 years ago | 0

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Answered
Replacing several values in multidimensional array simultaneously
A(:,:,1) = [1 2 3 ; 4 5 6]; A(:,:,2) = [7 8 9 ; 10 11 12]; s = size(A); A(:, sub2ind(s(2:3),[2 3],[1 2])) = 0 % = [0 0; 0...

5 years ago | 0

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Answered
How to generate a matrix with assigned probability?
it doesn't matter whereas it run in for-loop or not. x = 0.8; % probability of 1s m = 5; n = 2; % for ... A = rand(m,n)...

5 years ago | 1

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Answered
Permutations of array retaining sub-array groups together
Try this: A = [ 1 2 3 4 5 6 7 8] G = [ 1 2 2 2 3 4 5 5 ] l = diff(find([true,diff(G)>0,true])); Ag = mat2cell(A, 1, l); A...

5 years ago | 1

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Answered
How to calculate the angle between two sets of scatter plots?
clear o_data = [3.11009098091043 0.0161338808382554 -3.50871929189684; 34.1536562864604 0.446152781388255 -3....

5 years ago | 1

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Answered
How do I found A-B*x which these matrix are 3x3
Waoh, revise the theory of eigen vectors and linear algebra in general Multiply a vector by a constant diagonal matrix is like ...

5 years ago | 0

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Extract sub n-dimensional array from n-dimensional array
% Testt matrix A=randi(10,[2,3,4]) n = ndims(A); s = size(A); i = repelem({':'}, 1, n) ; i{end} = 3 % whatever page s...

5 years ago | 1

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Answered
error in matrix multiplication
MATLAB uses two different BLAS functions to perform B*D' and B*K In the first case, it use D and it never explicitly compu...

5 years ago | 1

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Answered
how to plot 2D mesh using coordinates and connectivity matrix?
Use FILL or PATCH

5 years ago | 0

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How to get the best combination of element to approach a value?
EDIT CODE If you have optimization toolbox a = [68,150,270,560,1000,2200,4700,9400] ; val = 7611 A = [ a, -1; -a, -1...

5 years ago | 0

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Answered
How to find the index of a non-integer array with closest value to any integer?
x = [3.75 22.95 2548.01 424.5] [~,i] = min(abs(x-round(x)))

5 years ago | 0

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Answered
Finding Minimum value of an anonymous function using fminbnd
You should not mix between discrete sampling of your function G and continuous evaluation required by FMINBND % Given : ...

5 years ago | 0

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Answered
creating a matrix from a vector
v2=linspace(-30,10,100) % This iis a ROW vector not column M1 = [v2.', v2.', v2.'] M2 = [v2; v2; v2]

5 years ago | 1

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Answered
Solving Matrix functions with a function
x0 = zeros(48,1); xA = lsqnonlin(@(x) f(x)-A, x0)

5 years ago | 0

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why my empty cell array taking 104 bytes instead of 112 bytes..?
A = {[]} is NOT an empty cell, it's 1 x 1 cell contains an empty array. An empty cell is A = {}

5 years ago | 1

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Answered
Reversing binary stream Conversion According to attached table?
function [output, outputchar] = reversebinrestore(m, array) if ischar(array) array = array-'0'; end switch m ca...

5 years ago | 1

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How to calculate the area of one Pixel?
The formula you get doesn't depend on the UNIT assuming you use the same unit everywhere. If length is pixel, then use area wit...

5 years ago | 0

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How do I create a function script to check the positive definiteness of a a square matrix of any size?
Code based on Sylvester's critterion function tf = isposdef(M) tf = ispd(M+M'); end function tf = ispd(M) tf = det(M)>0 &...

5 years ago | 0

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How I can solve linear programming with multiple quadratic and linear constraints?
Use FMINCON

5 years ago | 1

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Answered
How to create a checkerboard matrix without inbuilt function.
Two more methods toeplitz(mod(0:7,2)) or for even size kron(ones(4),[0 1;1 0])

5 years ago | 0

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Is discussion of cryptography allowed?
How those US regulations would matter for foreign participants like me? I'm not under those restriction or I'm I? If the answe...

5 years ago | 0

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Converting a maximizing problem into a minimizing program using linprog
You just need to reverse the sign of f. Don't touch the rest.

5 years ago | 0

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Access outer varargin inside a nested function
A varargin is just a cell. So pass it in the nested function as input argument function outer(a, b, varargin) function inn...

5 years ago | 0

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Answered
Graph Laplacian : very small values instead of zeros
Roughly the smallest non-zero eigenvalue of the laplacian has lower bound of 2*(1-cos(pi/N)) where N is the longest path of yo...

5 years ago | 1

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How to reproduce original matrix, after deleting zeros from matrix for computations
Put the index on the LHS CompleteResult = zeros(size(CompleteWlData)); % or nan(...) CompleteResult(Wl_indices) = FurtherProce...

5 years ago | 1

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How can I make a 2D color map?
Something like this R=[1 0; 1 0]; G=[1 1 0 0]; B=[0 0 0 1]; R = interp2(R,8); G = interp2(G,8); B = interp2(B,...

5 years ago | 1

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Answered
I have random uniform distributed points in a 3D plot. How can I subdivide the plot into cube shaped grids with equal volume.
N=1e3; % Number of points cubesize = 100; % meter subdivision = 3; % == 27^(1/3) subcubesize = cubesize/subdivision; % G...

5 years ago | 1

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Answered
rcond warning differs from computed value of rcond
When your matrix is ill-conditionned, everything computing that is related to the subspaces of the smallest eigen values are aff...

5 years ago | 1

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