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Matt J


Last seen: Today 自 2009 起处于活动状态

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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已回答
Facing problem in solving simultaneous nonlinear equation with 3 unknowns
What @Dyuman Joshi says is true. However, your equations don't seem to make sense without upper and lower bounds on x. For examp...

1 hour 前 | 0

已回答
Assigning row names iteratively
The row names of a table cannot be non-unique, so having the names of the 7 days of the week repeat 52 times would not generate ...

2 hours 前 | 0

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已回答
Plotting a giant surface exceeding array limitations
First of all, you should consider downsampling from 40000 points to perhaps 400. Having very dense data beyond a certain point w...

14 hours 前 | 1

已回答
Partial Fourier transform of large sparse 3D array
There is at most 1 nonzero pixel in each x-y plane (first 2 dimensions) ... I'm thinking of doing 1D Fourier transform on each d...

1 day 前 | 0

已回答
Partial Fourier transform of large sparse 3D array
You can do the partial Fourier transforms by computing a set of partial DFT matrices: dftPartial=@(N,k)sparse(exp(-(2j*pi/N)*(0...

1 day 前 | 0

已回答
Adding more values to an array every loop
One possibility, y=nan(1,100); s=0; for k=1:numel(y) y(k)=2*k-1; s=s+y(k).^2; if s>40, y...

1 day 前 | 1

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已回答
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...

1 day 前 | 0

已回答
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...

1 day 前 | 0

已回答
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...

3 days 前 | 0

已回答
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 ...

3 days 前 | 0

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已回答
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. >...

3 days 前 | 0

已回答
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...

3 days 前 | 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...

3 days 前 | 0

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已回答
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.

3 days 前 | 0

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

3 days 前 | 0

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已回答
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.

3 days 前 | 0

已回答
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...

4 days 前 | 0

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

4 days 前 | 0

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

4 days 前 | 1

已回答
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...

4 days 前 | 0

已回答
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,:)

4 days 前 | 2

已回答
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.

4 days 前 | 1

已回答
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...

5 days 前 | 1

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已回答
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,...

5 days 前 | 1

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

5 days 前 | 0

已回答
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...

5 days 前 | 0

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

6 days 前 | 0

已回答
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....

6 days 前 | 0

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

6 days 前 | 0

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

6 days 前 | 0

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