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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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Answered
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

Answered
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

Answered
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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Answered
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

Answered
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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Answered
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

Answered
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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Answered
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

Answered
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

Answered
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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Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

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

4 days ago | 0

Answered
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

Answered
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

Answered
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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Answered
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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Answered
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

Answered
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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Answered
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

Answered
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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