Answered
Why does my matrix not change with each iteration?
I don't know why you think B should be changed by the loop when you generate it prior to the loop and never touch it again. Perh...

1 year ago | 0

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Answered
Optimization of Material Parameters
lsqcurvefit

1 year ago | 0

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Answered
Doc links no longer work
I experienced this and found it was because of name conflict between one of my user-authored mfiles and a MathWorks-authored mfi...

1 year ago | 0

Answered
Can I run online a version different from the latest?
I don't think you can select an earlier Matlab version in Matlab Online.

1 year ago | 0

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Answered
How to customize the markers of the scatter figure, as shown below
Here's one way. Not sure you'll like the gymnastics that it requires: [x,y]=deal(rand(1,40), rand(1,40)); %scattered input dat...

1 year ago | 2

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Answered
Linear indices from colon operator
[I,J]=ndgrid(p1:p2,p3:p4); linear=sub2ind(size(array) , I,J);

1 year ago | 1

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Answered
Geometry properties in 3D (area, volume, moment of inertia...)
You can project your planar points into a 2D coordinate system and then use whatever 2D methods you had used previously to compu...

1 year ago | 0

Answered
Finding contiguous regions of interest in a mask and calculating the mean values of those regions when the mask is applied to an array
myImage=myImage'; L=L'; Lmax=max(L(:)); result=cell(1,Lmax); for i=1:Lmax result{i}=rasterMean(myImage(L==i...

1 year ago | 0

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Answered
Handling missing observations while using fmincon
They should be zeros rather than NaNs, shouldn't they? With zeros, they will make no contribution to the linear part of the pred...

1 year ago | 0

Answered
Filtering nose and removing spikes at local areas
Consider isoutlier.

1 year ago | 0

Answered
Develop a generalize MATLAB code to * perform the following transformations on a pentagon defined by the points A, B, C, D, and E, where the coordinates are based on the last
Consider polyshape

1 year ago | 0

Answered
I want the input of the neural network to be of data type 'SCB'
You haven't listed your Matlab version, but in newer versions, you are encouraged to be training with trainnet instead of trainN...

1 year ago | 0

Answered
randomAffine3d is not properly random
EDITED: If you don't like what the default randomizer is doing, randomAffine3d() also let's you define your own, e.g., ori = [e...

1 year ago | 0

Answered
randomAffine3d is not properly random
If you want an isotropic distribution across the entire sphere, this should do it. ori = [eye(3);-eye(3)]; N=1000; o=cell(N...

1 year ago | 0

Answered
slow imwarp with large arrays
20k x 20k is an incredibly high resolution. Do you really need it, and if so, do you really need to use cubic interpolation, as ...

1 year ago | 0

Solved

Sum along each diagonal of a matrix
Write a routine that returns the sums along the diagonals of a given matrix, A, where the first diagonal is the bottom left corn...

1 year ago

Answered
Warning: Equation is badly conditioned. Remove repeated data points or try centering and scaling.
9th order polynomials do tend to be badly conditioned. Try using a lower order, or perhaps a spline model.

1 year ago | 0

Answered
help counting number of times a value occurs across matrix
values = [111, 112, 121, 122, 211, 212, 221, 222, 311, 312, 321, 322, 411, 412, 421, 422]; edges=[values,inf]; dp = [111 112...

1 year ago | 0

Problem

Sum along each diagonal of a matrix
Write a routine that returns the sums along the diagonals of a given matrix, A, where the first diagonal is the bottom left corn...

1 year ago | 1 | 22 solvers

Answered
Unable to achieve desired speed up using parfor
I find that all instances on B finish in about half the time as those on A. It baffles me... That is the expected result, assu...

1 year ago | 0

Solved

Sum All Positive Elements
Output a scalar that is equal to the sum of all positive elements in a given vector/matrix. For Example: The sum of all positi...

1 year ago

Solved

Build a block Toeplitz matrix
A symmetric block Toeplitz matrix has the form, where the are compatibly-sized matrices. Write a routi...

1 year ago

Answered
How to avoid unrecognized option names using optimget
Although I am using R2024a, that particular code still uses an older (2016-2019) version of lsqcurvefit. If so, problem solved....

1 year ago | 0

| accepted

Problem

Build a block Toeplitz matrix
A symmetric block Toeplitz matrix has the form, where the are compatibly-sized matrices. Write a routi...

1 year ago | 0 | 6 solvers

Answered
Finding the Center of Broken Vase Slices
You can use ellipticalFit() from this download, https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tool...

1 year ago | 1

Problem

Condition number of Kronecker product
Given NxN matrix A and MxM matrix B, where M,N<=1000, write a routine to compute the condition number of kron(A,B).

1 year ago | 0 | 7 solvers

Solved

2x2 binning of a large sparse matrix
Consider the 20000 x 20000 sparse matrix, A=round(sprand(2e4,2e4,1/1e4*100)*1000); The task is to divide this matrix into 2x...

1 year ago

Solved

Convert a vector into numbers
Suppose a vector x = [ 1 2 4 7] is given. You have to convert this vector into string number y = '1247'. Examples x = [ 1...

1 year ago

Solved

Reverse within string
If input is a string 'yellow' the output should be 'leywol'. Locate the middle of the string and reverse the first (yel) and sec...

1 year ago

Solved

Minimum Distance Point to Segment
This Challenge is to determine the minimum distance from a 2-D line segment defined by two points to a point. The point is (p...

1 year ago