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**Feeds**

MATLAB eig function giving different eigenvectors on different computers?

"In both cases the computation A*V - V*D yields a matrix with entries on the order of 1e-14, so all is well numerically in both ...

5 days ago | 1

| accepted

How to rewrite this high dimensional matrix calculation

Fully vectorized Y = reshape(X, [], 1, C); Z = reshape(Y, 1, [], C)-Y; Z = reshape(Z, [], C); Z(1:A*B+1:end,:) = Y; Z = res...

6 days ago | 1

| accepted

Is genetic algorithm far from upper bound ?

Use optimization with constraints to fix the upper bound You can provide the upper bound in ga as well

8 days ago | 0

Interpolate and plot a surface in a rotated coordinated system

Try this and see if it's OK for you load('measurement_data.mat'); % fit a plane through the data and plot xyz = [x y z]; [...

8 days ago | 0

| accepted

Check if file directory exists, else create it

mkdir(FullDirectory) rather than mkdir FullDirectory

8 days ago | 0

| accepted

scale/normalize parameter vector for optimization

An interesting idea of generic "preconditioning" of Bspline approximmation is working with Dual Bernstein basis, decribe in Lu p...

8 days ago | 0

scale/normalize parameter vector for optimization

1. In machine learning literature, I often encounter [0,1] scaling as a common technique. Would this approach be suitable for m...

9 days ago | 0

| accepted

Calculation of the moving mean for the first items

From movmean doc "M = movmean(A,k) returns an array of local k-point mean values, where each mean is calculated over a sliding ...

11 days ago | 0

Intersection of Discretized Curves

Use this file exchange https://www.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections This code is robust, it d...

11 days ago | 1

How can I run code just once, for multiple intervals of numbers?

Use for loop

12 days ago | 0

| accepted

How to write ASCII to byte file?

bytes = uint8([126, 129]) data = char(bytes); % Exceeds 7 bit ASCII Not sure about the encoding standards but this seems t...

12 days ago | 2

Delete a timer object in it's callback

I don't know, but I have programmed the same toys, my worlflow is like this close all; fig = figure; ax = axes('Parent', fig)...

12 days ago | 0

How to open help doc in a Window rather than browser？

https://www.mathworks.com/help/install/ug/install-documentation-on-offline-machines.html

12 days ago | 0

| accepted

transform linear inequality constraints into bound constraints for optimization solvers

No you cannot. It is well known that any generic linear constraints Aeq * x = beq A * x <= b lo <= x <= up is equivalent to...

13 days ago | 0

| accepted

Question

Intel ARC graphics device and MATLAB

Not really a question but I would like to report many issues withh App Designer and its stand alone version when using with Inte...

13 days ago | 1 answer | 0

### 1

answerHow can I determine the angle between two vectors in MATLAB?

There is a good formula from Kahan, chap 12 of this Mindless paper, for given x and y two vectors of length(m) - in R^m, the ang...

18 days ago | 3

moving median with variable window

One way (for k not very large) x = 1:6 k = [2,3,4,5,3,2]; % Note: I change k(3) to 4 winmedian(x,k) function mx = winmedia...

22 days ago | 2

How to measure graph wave distance ?

It looks like you need to rotate the whole picture (red line + blue curve) to minus the slope of the red line. After rotation t...

23 days ago | 0

Quivers/streamlines not perpendicular to contours

Add the command axis equal Different aspect ratio in x and y can skew the perpendicularity visually.

23 days ago | 0

MATLAB Error - Local function name must be different from the script name.

Perhaps swap those two fitst lines in your code file function F = c_objective(x) global intcon f Q nmsi M S I ... Warning: u...

24 days ago | 1

| accepted

question about function handles in OO

Something extra must happen internally by the parse when you create function from method, but it only happens at the first level...

25 days ago | 0

| accepted

Question

Chasing what is wrong with 'dual-simplex-highs' in linprog

I try to see why 'dual-simplex-highs' algorithm fails and 'dual-simplex-legacy' works OK on this specific LP problem of size 46...

1 month ago | 3 answers | 2

### 3

answersBest computer specifications for fast Matlab numerical simulations/integrations?

The bench command in R2024a rates intel i9-12900 CPU on Windows 11 and Mac M2 best for ODE IMO the intel processor get hot easi...

1 month ago | 1

I substracted two 3D matrix and get a 2D matrix instead of 3D matrix, why?

You need to put 3 indexes in 3d array. If you put 2 it reshape your array to 2D. The correct command is probably dp=minus(p(1:...

1 month ago | 0

Scatteredinterpolant (linear) from symmetric data does not produce symmetric isolines

scatteredinterpolant all methods is based on triangulation of the data points. Even the data points are symmetric, the triangula...

3 months ago | 0

Intersection condition between two ellipses

Use FSOLVE to find numerical solution. Only xaimum one can be found c1 = [0; 5]; % circle center #1 c2 = [-5; 2]; % circle c...

3 months ago | 0

Intersection condition between two ellipses

Here is a solution for generic ellipses using FEX file here % Ti and ci define two ellipses E1 and E2 of the form % (x,y) st n...

3 months ago | 0

find a zero of a two-variable function

If you are not unlucky Trajectory = @(x) sum(x.^2,2)-34^2-1; % Test function, use use rather own X0 = [9.609 , 32.288]; %ini...

6 months ago | 0

call function name in the same function

This returns the name of the function being executed s = dbstack; funname = s(1).name; In recent MATLAB versions you can do i...

6 months ago | 1

| accepted

pinv operation in matlab

NOTE: This code is useful fonly or users who run version greater than R2021a and before R2024a, where pagesvd is supported by pa...

6 months ago | 0