Risposto
is there a way to perform this task w/o using loops?
You might consider store in table instead NOTE: using table would be more convenient to access data, not necessary faster p.va...

5 mesi fa | 1

Risposto
How can I stabilize the matrix left division (i.e. "\")?
Try pinv, lsqminnorm it can stabilize somewhat the inversion with (near) singular matrix. Both bave a tolerance argument to tune...

5 mesi fa | 0

Risposto
square matrix containing Chebyshev polynomials becomes singular when its size becomes greater than a certain value
That is exactky what I have suggested in my answer: use the Chebyschev nodes t0 = 0; tf = 4; N = 75; syms x h = chebyshevT(...

5 mesi fa | 0

Risposto
square matrix containing Chebyshev polynomials becomes singular when its size becomes greater than a certain value
If you select discrete points d the Chebychev nodes see definition wiki, and not uniform, it will become well posed.

5 mesi fa | 0

Risposto
interpolate a 2D map (array) of density samples and preserve the total ?
Use trapz for the integration (not sum), it should match (up to round off) with linear interpolation and interger subsamping fo...

5 mesi fa | 0

Domanda

xlabel/ylabel 'HorizontalAlignment' issue
I don't understand the 'HorizontalAlignment' of the text labels. It is not centered (when the figure has different size than the...

5 mesi fa | 1 risposta | 2

1

risposta

Risposto
Coefficents of piecewise polynomial in matlab
Similar answer as here points = [1 0 -1 0 1;0 1 0 -1 0]; pp = cscvn(points) m = pp.dim; p = pp.pieces; %D = diff(poi...

5 mesi fa | 0

Risposto
cscvn of a function, coefficients and breaks
This is how to use pp m = 2; n = 5; % 25 in the original question points = rand(m,n); pp = cscvn(points) m = pp.dim; p =...

5 mesi fa | 0

Risposto
How to index two vectors together
There is FEX, and fast if you have compiler and compile the mex file. https://www.mathworks.com/matlabcentral/fileexchange/2985...

5 mesi fa | 0

Risposto
The difference between performing the fft2 and the convolution
Use this function, it will perform the convolution using fft method rightly https://www.mathworks.com/matlabcentral/fileexchang...

5 mesi fa | 0

Risposto
How can I rotate the axes' labels parallel to the orientation of the axes?
Try this (the letters of label are rotated but the aspect ratio remain constant so they can be read easily but are not look like...

5 mesi fa | 0

| accettato

Risposto
Compact way to calculate the centroid of a boundary of a set of points
@Sim The area of the polygonal (A in the book) is sum(A)/2 in Jan code. So sum(A)*3 in Jan's code is equal to 6*area. They are...

5 mesi fa | 0

Risposto
Mex function Implementation for nested-functions
you did not include operation.c in mex command

5 mesi fa | 2

| accettato

Risposto
Strange warning how to interpret it?
Fixed with update 4 https://www.mathworks.com/support/bugreports/3114312

5 mesi fa | 2

| accettato

Risposto
Compute only a few entries of a big matrix product
It will not store the result in 2D matrix but 3D array. I hope you can switch to this format of storage. x=rand(10000,10); k =...

5 mesi fa | 0

| accettato

Risposto
Matrix addition only to elements equal to zero
C=B; B0 = B==0; C(B0)=A(B0);

5 mesi fa | 0

| accettato

Risposto
Code gets stuck loading when I try to run it.
First look of your code shows that you do this mistake: https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays....

5 mesi fa | 0

Risposto
How to efficiently calculate a weighted sum of 3 dimensional matrix through a vector in matlab
This uses matrix multiplication so it should be well optimized and fast. [m,n] = size(A, [1 2]); C = reshape(A,m*n, []) * B(:)...

5 mesi fa | 2

| accettato

Risposto
Matrix inverse in objective function
The inv() is not supported by optimization expression see https://www.mathworks.com/help/optim/ug/supported-operations-on-optimi...

5 mesi fa | 0

| accettato

Risposto
Find all possible combinations of numbers with a specific array length
char(dec2base(0:4^12-1,4)+('A'-'0'))

5 mesi fa | 1

Risposto
Order of code execution seems weird
%% Function in app.PlotSetup function printProcess(app, message) app.StatusEditField.BackgroundColor = app.yellow; app.Status...

5 mesi fa | 1

Risposto
how to use plot to draw a minor arc in matlab without calculating the angle range?
% Generate A, B, C, C is the center and A B are two points on circle r = rand(); C = randn(2,1); phi1 = 2*pi*rand; A = C + r...

5 mesi fa | 1

Risposto
Multipilication of N-dimension array
D = rand(3, 3, 3); rotm1 = rand(3, 3, 2); for num=1:size(rotm1,3) for i=1:size(D,3) res(:,:,i,num)=rotm1(:,:...

5 mesi fa | 1

Risposto
Why does C{1}(1) work but C(1){1} results in an invalid array index error in MATLAB?
"I would like to understand the rationale behind MATLAB's requirement for parentheses indexing to appear last in an indexing exp...

6 mesi fa | 0

Risposto
How can I produce this matrix?
m=6 n=3 j=randperm(m,n-1); A=accumarray([2:n;j]',1,[n,m]); A(1,setdiff(1:end,j))=1

6 mesi fa | 1

| accettato

Risposto
Implicit expansion for griddedInterpolant
You can do your own extension as showed here https://www.mathworks.com/matlabcentral/answers/2043017-bilinear-interpolation-fas...

6 mesi fa | 0

Risposto
Linking Matlab Libraries to Mingw for Another C++ Program
You need https://www.mathworks.com/products/matlab-compiler-sdk.html

6 mesi fa | 0

Risposto
matrix value propagation along the rows
Any of these should do A = [1 2 3 4 5 6 7] B(1:19,1:7)=repmat(A,19,1) B(1:19,1:7)=repelem(A,19,1) B(1:19,1:7)=A(ones(1...

6 mesi fa | 0

| accettato

Risposto
Bilinear interpolation faster than interp2?
Try this, about 5 time faster for your example clc close all n = 7; nq = 30; curv = 2.5; %qinterp2 works properly only if c...

6 mesi fa | 1

| accettato

Risposto
adding all fields of a structures
s.bin_1=array2table(rand(2,3)); s.bin_2=array2table(rand(3,3)); s.bin_3=array2table(rand(4,3)); c=struct2cell(s); newstruc...

6 mesi fa | 0