Matt J

Last seen: Today | Active since 2009

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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My ellipse wont close after running the code .
Can't you just use the native spline() command? theta = linspace(0, 2 * pi, 8); t_x = 2*cos(theta); t_y = sin(theta); dt_x...

3 hours ago | 0

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Newton Raphson to solve a system of non-linear equations
From the surface plot, the equations don't appear to have any solution, or at least no where near the vicinity you are searching...

4 hours ago | 0

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Why is my gamultobj algorithm not working?
My guess would be that it is struggling to find feasible solutions to the nonlinear constraints (perhaps because they don't have...

1 day ago | 0

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Solve large number of independent systems with fsolve, where some systems do not have a solution
I see no reason why fsolve would "give up" if you've set MaxIterations and MaxFunctionEvaluations to Inf, regardless of whether ...

1 day ago | 0

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Display long strings that include newlines in a table
I don't think there's a way. But you could write to an Excel file (e.g., with writetable) where multiline cells are possible. >...

1 day ago | 0

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Dot indexing is not supported for variables of this type.
Have you actually looked at the contents of device? Is it possible that MAI.GetDeviceByIndex(0) returns empty [] because someth...

1 day ago | 0

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understand in which function the field is filled
If ReportAggreg is created literally with an assignment statement of the form someStruct.ReportAggreg = something it should be...

1 day ago | 0

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Can I define the relationship between input and output using the raw experimental data in MATLAB. somthing like this .
Yes, you have a choice of lsqcurvefit, fit, and various others.

1 day ago | 0

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How can I get X value by transforming the griddedInterpolant function?
Why not just, F=scatteredInterpolant(Y(:),Z(:),X(:));

1 day ago | 0

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Is there any layer defined in matlab for sine activation function? Or else can we define the layer using functionLayer?
If it will not have any learnable parameters, you can use a functionLayer.

1 day ago | 0

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How can I use the returned sort index from the sort() function on a multidimensional array?
The easier way would be to use the attached modification of sort() which will simply return the output indices as lienar indices...

2 days ago | 0

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Loop around a toolbox
This runs: for N = 40:42 %<---shortened Daten=rand(N);%<-----added v = [1]; m = zeros(1,N); for n ...

2 days ago | 0

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app class properties check
I imagine that you could define your own property validation function, https://www.mathworks.com/help/matlab/matlab_oop/propert...

2 days ago | 1

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Using Linear indicies to create new image
stats=regionprops(BW,'PixelIdxList'); Z0=false(size(BW)); for i=1:numel(stats) Z=Z0; Z(stats(i).PixelIdxLi...

2 days ago | 0

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How to extract all values along the third axis of a 3d-array using a logical 2d-array?
a = rand(10,10); a(5,5) = 10; b = a+rand(1,1,1000); br=reshape(b,[],size(b,3)); c = br(a == 10,:)

2 days ago | 1

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How can I graph these two equations in matlab?
One way, f =@(y) (y-4).*(2*y-y.^2); fplot(f); xlabel y; ylabel f(y) and similarly with the other function.

3 days ago | 0

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Common legend for each row of tiled layout
I could do nested tiled layouts, but that seems very cumbersome, especially when I have many more rows. Why? %% Make Layout Sk...

3 days ago | 1

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Answered
is there a way to perform this task w/o using loops?
There are ways to do it without loops, but doing it without loops will be of no benefit to you. It will take more lines of code,...

4 days ago | 1

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Draw angled ellipses around clusters on PCA plot
Using polyshapes: ellipse=rotate( scale(nsidedpoly(1000),[2,1]) ,30); plot(ellipse)

4 days ago | 0

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Draw angled ellipses around clusters on PCA plot
See also elliipticalFit from the FEX downloadable, https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-t...

4 days ago | 0

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How can I stabilize the matrix left division (i.e. "\")?
You cannot. You must regularize the problem somehow and make the matrix non-singular.

4 days ago | 0

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Solving a quadratic optimization problem subjected to linear constraints
You can use lsqnonneg, xi=[0, 0.25, 0.5, 1, 1.2, 1.8, 2]'; fi= [2, 0.8, 0.5, 0.1, 1, 0.5, 1]'; phi=@(r) max(0, 1 - r).^4....

4 days ago | 0

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Simple Indexing problem when creating a matrix
n=5; A=[0 60 120 180 240 300 360]; A=A+360*(0:n-1)'

4 days ago | 0

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how to project a contour along a surface plane?
This looks applicable: https://www.mathworks.com/matlabcentral/fileexchange/8589-contourz?s_tid=srchtitle

5 days ago | 0

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Find function misbehaves when Indexing into array
Perhaps this is what you meant, LogicArray = x < Tolerance; LogicArray(1:4)=false; FindIndex = find(LogicArray,1,'first')...

5 days ago | 1

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fmincon optimization: is the first order optimality very sensititve to changes in the step tolerance?
So given the results I show, can we qualititatively say that the objective is likely to be very flat at the solution? Or somethi...

5 days ago | 0

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Answered
optimize vector by fminimax
if with my first input i have this vector (output) (1 2 5 6 9 5) and with next input i have this one (1 2 9 6 9 1) as you can ...

5 days ago | 0

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Answered
How to get the distance references of geometry and curvature of the object?
I was able to do it with the help of some FEX downloads: https://www.mathworks.com/matlabcentral/fileexchange/90762-further-too...

5 days ago | 0

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Indexing matrix with multiplication
No. You can easily see they are not the same by comparing them yourself: T=randi(30,5) mask=T>20; T(mask) T.*mask

6 days ago | 1

Answered
Access MinFeretCoordinates data in regionprop table
For example, stats{1,'MinFeretCoordinates'} stats{2,'MinFeretCoordinates'} stats{3,'MinFeretCoordinates'}

6 days ago | 0

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