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

casi 6 años hace | 0

| aceptada

Respondida
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...

casi 6 años hace | 0

Respondida
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.

casi 6 años hace | 0

| aceptada

Respondida
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...

casi 6 años hace | 0

| aceptada

Respondida
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)...

casi 6 años hace | 1

| aceptada

Respondida
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...

casi 6 años hace | 1

| aceptada

Respondida
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....

casi 6 años hace | 1

| aceptada

Respondida
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 ...

casi 6 años hace | 0

Respondida
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...

casi 6 años hace | 1

| aceptada

Respondida
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...

casi 6 años hace | 1

| aceptada

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

casi 6 años hace | 0

Respondida
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...

casi 6 años hace | 0

| aceptada

Respondida
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)))

casi 6 años hace | 0

| aceptada

Respondida
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 : ...

casi 6 años hace | 0

| aceptada

Respondida
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]

casi 6 años hace | 1

| aceptada

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

casi 6 años hace | 0

Respondida
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 = {}

casi 6 años hace | 1

| aceptada

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

casi 6 años hace | 1

Respondida
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...

casi 6 años hace | 0

Respondida
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 &...

casi 6 años hace | 0

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

casi 6 años hace | 1

| aceptada

Respondida
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])

casi 6 años hace | 0

Respondida
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...

casi 6 años hace | 0

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

casi 6 años hace | 0

| aceptada

Respondida
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...

casi 6 años hace | 0

| aceptada

Respondida
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...

casi 6 años hace | 1

Respondida
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...

casi 6 años hace | 1

Respondida
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,...

casi 6 años hace | 1

| aceptada

Respondida
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...

casi 6 años hace | 1

| aceptada

Respondida
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...

casi 6 años hace | 1

| aceptada