Matt J

Last seen: Today | Attivo dal 2009

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Professional Interests: medical image processing, optimization algorithms PLEASE NOTE: I do not read email sent through my author page. Please post questions about FEX submissions in their respective Comments section.

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Identifying Boundary Nodes in a Point Cloud
If the regions are supposed to be convex, you can use convhull or convhulln.

1 giorno fa | 0

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How to find the multiplication or division value of a matrix for each row and column in matlab
A.*B A./B

1 giorno fa | 0

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Overlay data points on image plot and only rotate image points not the image using imref2d
load B.mat; %load reverse imcomplement of image load x_world load y_world figure(1); theta = -90; %rotate image counterclock...

3 giorni fa | 0

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What is the correct way to save a large MATLAB structure?
but how can 56GB of "overhead" be considered acceptable? It depends on what your struct contains. Field data containing handle ...

3 giorni fa | 1

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How to remove all NaN and Inf values when calculate the mean?
If you're saying you want to take the column-wise mean, ignoring zeros and non-finite values, then you could do, exclude = (Lo...

3 giorni fa | 0

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Can MATLAB do a 2-D FFT on a uniform parallelogram grid of measured points?
I need to Fourier Transform my parallelogram grid of measured values into ground freq domain, the Inv FT that into ground time d...

4 giorni fa | 0

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How to find the point the graph crosses the x axis
x = @(t) (0.3) .* exp(-3 .*t) .* cos(4 .* t) + 0.2 .*exp(-3 .* t) .* sin(4 .* t); firstroot = fzero(x,[0,1]) %% graphs par...

5 giorni fa | 0

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After segmentation how to save number of subobejcts for each objects
If you mean you want to extract the sub-images forming the bounding box of each circle, then perhaps something like the followin...

5 giorni fa | 0

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How to use fsolve to solve all the equations?
given too many results Perhaps you should use uniquetol, rather than unique.

6 giorni fa | 0

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Controlling aspect ratio for tiled layout
[epsilon, phi,omega]=deal(rand(10), rand(10), rand(10,1)); tiles = tiledlayout(1,3); tiles.TileSpacing = 'loose'; ax1 = ...

7 giorni fa | 0

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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...

7 giorni fa | 0

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Optimization of Material Parameters
lsqcurvefit

7 giorni fa | 0

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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...

8 giorni fa | 0

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

8 giorni fa | 0

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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...

9 giorni fa | 2

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

9 giorni fa | 1

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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...

10 giorni fa | 0

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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...

10 giorni fa | 0

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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...

11 giorni fa | 0

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Filtering nose and removing spikes at local areas
Consider isoutlier.

13 giorni fa | 0

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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

13 giorni fa | 0

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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...

15 giorni fa | 0

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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...

16 giorni fa | 0

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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...

16 giorni fa | 0

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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 ...

18 giorni fa | 0

Risolto

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...

18 giorni fa

Risposto
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.

18 giorni fa | 0

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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...

19 giorni fa | 0

Problema

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...

19 giorni fa | 0 | 9 risolutori

Risposto
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...

23 giorni fa | 0

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