
Matt J
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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How to have a class that contains multiple functions that is used in other classes?
A static class method can be imported from a package like in this example, https://www.mathworks.com/help/matlab/ref/import.htm...
12 minutes ago | 0
Adding zeros to a column vector to match a larger column vector
This gracefully handles the case when length(x)=length(y), and requires no consideration of whether x,y are row or column vector...
4 hours ago | 0
Is Conv2 based on direct convolution?
It is not FFT-based. To do FFT-based convolution (using the overlap-and-add method) you could use fftfilt.
4 hours ago | 0
How to draw a generic cylinder with arbitrary orientation
See this File Exchange download, https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools-for-fitting-c...
4 hours ago | 0
Loading files by replacing some part of the name with a variable
Pre-generate all of the filenames and loop over them. FileNames = compose("GNSS_Validierung_%.2d",(1:41)' )
11 hours ago | 0
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...
13 hours ago | 0
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 ...
13 hours ago | 0
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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...
1 day ago | 1
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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 ago | 0
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...
2 days ago | 0
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...
2 days ago | 1
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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...
2 days ago | 0
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...
2 days ago | 0
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 ago | 0
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 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. >...
3 days ago | 0
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 ago | 0
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...
4 days 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.
4 days ago | 0
How can I get X value by transforming the griddedInterpolant function?
Why not just, F=scatteredInterpolant(Y(:),Z(:),X(:));
4 days 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.
4 days ago | 0
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 ago | 0
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 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...
4 days ago | 1
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 ago | 0
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 ago | 2
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.
5 days ago | 1
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 ago | 1
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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,...
6 days ago | 1
Draw angled ellipses around clusters on PCA plot
Using polyshapes: ellipse=rotate( scale(nsidedpoly(1000),[2,1]) ,30); plot(ellipse)
6 days ago | 0