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Matt J


Last seen: Today Active since 2010

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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
How is calculated the determinant of a matrix containing a fourier transform?
N=1024; Fs=4000; f=(0:(N-1-ceil((N-1)/2)))/N*Fs; jw = 1j*2*pi*f; determinant = (jw-x2).*y1 - (jw-x1).*y2 ;

16 hours ago | 0

| accepted

Answered
Question about using "diary" command
I don't see anything about it in the documentation, but it makes sense that the file write would be postponed until after all te...

2 days ago | 0

| accepted

Answered
help me get the points of the mask
You can try bwlpolyshape(), downloadable from, https://www.mathworks.com/matlabcentral/fileexchange/181422-fit-polyshape-to-obj...

3 days ago | 0

Answered
Please help me. I want to run this attached simple code
Do what the error message says. Use .^ instead of ^

4 days ago | 0

Answered
Problem with fit Model with odd order polynomial
Don't use a custom fit type. Use the builtin poly5 fit type, with bounds on the even degree coefficients. [x,y] = readvars('Dis...

6 days ago | 1

| accepted

Answered
setting current directory using cd from inside .mlapp files
I can't say I'm super happy with cd's unreliable functionality but glad for an alternate solution. It's not cd() that is at fau...

6 days ago | 0

Answered
Zero-Padding Position for FFT
If you only care about the amplitude spectrum the shifts don't really matter, but otherwise, you would do, n=floor(numel(x)/2)+...

7 days ago | 0

Answered
How do I correctly find parameters using the fittype function without it just using my initial guesses?
This uses fminspleas, downloadable from, https://www.mathworks.com/matlabcentral/fileexchange/10093-fminspleas It requires an...

8 days ago | 1

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Answered
Is it possible to preview the contents of MAT files in R2025a?
If you right-click on the .mat file in the Current Folder pane, you will see a Preview option: ...

10 days ago | 0

| accepted

Answered
Reading column vectors from table with header text as variable name
You should never be letting code decide what to name variables. You should know the names. If you do, just use readvars, [Var1,...

10 days ago | 0

Answered
Dual simplex method for problems not dual feasible
Can anyone point me to any references that detail how the dual simplex method works for problems that are not dual feasible. I...

11 days ago | 0

Answered
Dual simplex method for problems not dual feasible
This is not always true. It is always true, by the Strong Duality Theorem. Once it has been determined that the dual is infeasi...

13 days ago | 0

Answered
looking for strictly recurrent and fast moving median implementation
It sounds like you should be using Simulink, in particular a median filter block, https://www.mathworks.com/help/dsp/ref/median...

13 days ago | 0

Answered
Undefined function handle error when loading a neural network that contain a function layer
I tried to save the function in a dedicated file "Feature_wise_LM.m" , but it didn't work It should work. Make sure the locati...

13 days ago | 0

Answered
Indexing vectors with a zero and creating a "predicted" vector knowing what the diff should be
Here's an approach using the an integer-constrained linear fitting routine minL1intlin, downloadable from https://www.mathwork...

13 days ago | 0

Answered
Dual simplex method for problems not dual feasible
If the dual problem is not feasible, the primal is unbounded or infeasible, so the solver will just bail out with an empty solut...

14 days ago | 0

Answered
How to implement N number of realizations of a for loop?
The output below shows that the loop already runs 50 times. Not sure why you think otherwise. % vChGB Sine Hyperbolic Gaussian ...

15 days ago | 0

Answered
Trying to do an fsolve via an anonymous function
It doesn't look like you need an iterative solver at all. It appears that your rho0() function is just a reinvention of normcdf ...

15 days ago | 0

Answered
Extract certain data from array where repeats are present (but constant values)
Why not as follows, low= find(Y==min(Y),1,'last'); high=find(Y==max(Y),1,'first'); d=d(low:high,:);

16 days ago | 0

| accepted

Answered
Too small vertical bar showing errors and warnings in the Editor
Put the mouse in the editor Window. Hold the Ctrl key and rotate the mouse wheel to restore the zoom to 100%. Then, go into Pre...

17 days ago | 1

| accepted

Answered
Precision lost when combining Int32 integers with single precision numerical numbers
I wasn't there when the decision was made, but I suspect it would be because in Matlab, numeric literals are always double float...

18 days ago | 0

Answered
Scatter‐plot marker edge color turns black when copying to PowerPoint
If you download export_fig, https://www.mathworks.com/matlabcentral/fileexchange/23629-export_fig?s_tid=srchtitle and if you...

18 days ago | 0

Answered
Readtable and Readmatrix Ignore Specified Range and Produce Extra Variables
When I save as .xlsx, it seems to work okay, in1 = readtable('2025-03-28_02-07_10-0.xlsx', 'ReadVariableNames', false, 'Range',...

19 days ago | 0

Answered
Connecting points on opposite end of mask
load('coping_data (1).mat') img=logical(img); n=height(points); f=@(z,n) circshift(z,-n); mod1=@(z) mod(z-1,n) + 1; x...

19 days ago | 0

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Answered
concatanate arrays upon condition
The way your data is held, as separate enumerated variables, doesn't leave many options. The first thing would be to undo that: ...

19 days ago | 0

| accepted

Answered
Clean and automate indents in scripts an live scripts
Download my editorExtract and editorReplace tools, https://www.mathworks.com/matlabcentral/fileexchange/181000-customized-text-...

20 days ago | 1

| accepted

Answered
appDesigner: How to set tree checkbox names = names of .xlsm files in the directory
Something like this, function startupFcn(app) % Get .xlsm files in the current directory (or specify full path) docFi...

21 days ago | 0

Answered
estimate camera parameters with fixed translation z value?
Not with estimateCameraParameters. You will have to implement your own constrained routine using lsqcurvefit or lsqnonlin, but y...

22 days ago | 1

Answered
Finding coordinates of a point from bisector of two lines
M1=P1/2; Q1=norm(M1)*P2/norm(P2);

22 days ago | 1

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