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Matt J


Last seen: Today 2009 以来アクティブ

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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Entering data into cell array
noble_gases{1,1}="Hydrogen"; noble_gases{1,2}="H"; etc...

約2時間 前 | 0

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Sum matrix column orderly
B=conv2(A,ones(15,1),'valid').';

約2時間 前 | 0

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Transformation matrix (projective2d) change of origin at application
You should use the OutputView option to specify a coordinate system for the output with the origin in the center.

約2時間 前 | 0

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Plotting ellipses around the data points and circle around the cluster points
At the very end of the the Examples tab of https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools-for...

約2時間 前 | 0

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How do I get values of a certain parameter in a multi-dimensional matrix?
b should be an Nx1 vector where N is the number of elements satisfying A<10000.

約3時間 前 | 0

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Wrong ROI Ellipse rotation angle documentation?
In the coordinate conventions of the Image Processing Toolbox, the Y-axis points downward and the Z-axis is pointing into the sc...

約3時間 前 | 0

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vectorisation of a loop
A=pdist2(Sea,Sea); A(A<0.05)=[];

約3時間 前 | 0

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How can I assign a single column of a 0x10 empty table
I cannot use a struct or array. The datatype must remain as a table. You cannot avoid wokring with arrays as an intermediary, ...

約24時間 前 | 0

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Find longest consecutive sequence in 3d matrix
Using, https://www.mathworks.com/matlabcentral/fileexchange/78008-tools-for-processing-consecutive-repetitions-in-vectors [M,...

1日 前 | 0

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Find argmin of function with two input variables
MATLAB keeps returning Empty sym: 0-by-1 and I don't understand why. Any help? The solution to diff(La,x1)==0 is x1 = -0.5, whi...

1日 前 | 0

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Does the code run on the GPU after transferring data to the GPU using the gpuArray function?
Any operations you do on a gpuArray object will be done on the GPU. Operations you do on other objects (not gpuArrays) will be e...

1日 前 | 0

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I cannot figure out how to fix this error "Objective function is returning undefined values at initial point. fsolve cannot continue."
I suspect you meant to have 6 values in x0 rather than 7. x0=[1,1,1,0.02,0.02,0.02];

2日 前 | 0

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How to apply an equation to each element in the array?
conv( u , [0 1 0]+alpha*[1 -2 1] )

3日 前 | 1

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How do I produce all possible permutations of a vector, selecting a chosen number of elements?
a=[4,17,13,5,1,90]; n=3; P=perms(1:n).'; b=nchoosek(a,n).' ; out=reshape( b(P(:),:),n,[]).'

3日 前 | 0

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How to update constraint in nonlinear optimization
Divide into 3 sub-problems. Solve with the constraints (1) y<=20 and NLcon (2) 20<=x<=40, y<=20, and NLcon (3) y>=20 and NLco...

5日 前 | 0

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Im trying to run fsolve inside a for loop but it seem that my second iteration inside the for loop is not able to read the initial trial point
Should the division be by Afull(i)? F = @(GG)[slopeACdisp(i)-((GG(2)-Cdispy)/(GG(1)-Cdispx(i))); -tau+(0.5*abs((G...

5日 前 | 0

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Accessing (interpolating?) data in 3D array
You could use griddedInterpolant() array=rand(290,480,90); F=griddedInterpolant(array); extract=F({linspace(4,8,10), 400:...

5日 前 | 0

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Problem with parfor with two variables
Do you need to see the toc output in real time? If not, just save it until later: %% My code Y_1 =nan(N,numel(alpha),numel(bet...

7日 前 | 0

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Converting Structure into 3d Matrix
Matrix=cat(3, all_frames.Frame); However, you will need generous RAM. Your all_frames structure already consumes about 5 GB in...

7日 前 | 0

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Optimization Problem but don't have closed form expression
The problem is that I dont have a closed form expression for B_k in terms of μ_k. if I have a set of values for μ_k to get the c...

7日 前 | 0

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how to generate integer sequence number by logistic map?
function [z] =logistic(r,N) %sequence is chaotic where 3.57 < r < 4. %r = 3.8; % r parameter for chaotic regime %size ; % siz...

7日 前 | 1

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circle inside triangle tangent points
You can find the circle using incircle in this FEX submission https://www.mathworks.com/matlabcentral/fileexchange/34767-a-suit...

7日 前 | 0

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fmincon gets very slow after few time
A few more performance optimizations that you should consider: maps = zeros(rows,columns,3,'single'); %<------ post conversio...

7日 前 | 1

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fmincon gets very slow after few time
I suspect samsid() is just not as smooth or well-conditioned as mse() for some pixels, and therefore takes more iterations to te...

7日 前 | 0

質問


Restore toolbar buttons to app after migration from GUIDE
After using the Guide-to-AppDesigner migration tool, my app no longer has the standard figure toolbar buttons in the app figure ...

8日 前 | 0 件の回答 | 0

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Finding intersection points in a square.
Yes, you can use, https://www.mathworks.com/matlabcentral/fileexchange/93470-intersections-of-multiple-2d-lines-or-line-segment...

8日 前 | 0

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Trying to understand behavior of holes in alphaShapes.
I found the following in posted material for a course at Stanford. It's a pretty intuitive explanation of how alpha shapes work,...

8日 前 | 0

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Function to compute product of all numbers from 1 to n
integerproduct(5) function r = integerproduct (n) if n==1, r=1; return; end r=n*integerproduct(n-1); end

8日 前 | 0

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Replacing Negative Values in Table with Previous Value in Column
T(:, {'D', 'E'}) = num2cell( fillmissing([D,E], 'previous') );

8日 前 | 0

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How do I create a 2D mesh of triangular elements?
Yes. Or triplot().

8日 前 | 0

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