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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
App Designer: Push-button and keep certain variables in workspace
Have the function store the data in a property of the app. https://www.mathworks.com/help/matlab/creating_guis/manage-propertie...

16 minutes ago | 0

Answered
I am trying to generate a plot for the 3x+1 problem for the seed 10^310 but i am unable to get the plot? Why
It's because 1e309 is too large for double float math to handle. The largest integer that can be expressed in double float preci...

2 days ago | 1

Answered
Wierd wiggle in plot of symbolic expression
There appears to be a mistake in your expression for cutoff(). Also, using floor(t) for the upper limit of the symsum makes it h...

3 days ago | 1

Answered
Wierd wiggle in plot of symbolic expression
Seems like a lot of unnecessary symbolic math gymnastics for such a simple function. IB0=@(t) min(t,1); fplot(IB0,[0,9], 'Li...

4 days ago | 2

Answered
Create figures with different number of images but same sizes
If you mean you want a common image size across all axes in both figures, I think the best that you can do is relocate both layo...

4 days ago | 0

Answered
Solving a system of a changing number of nonlinear equations
Because your equations are 4-th order polynomials, they are apt to have multiple roots. You probably won't get a physically sens...

5 days ago | 0

Answered
Merging multiple dictionaries with dictionaries
A = dictionary(dictionary(["key1"], {1}), dictionary(["key2"], {2})); A(dictionary(["key3"], {3})) = dictionary(["key4"], {4});...

5 days ago | 1

| accepted

Answered
Merging multiple dictionaries with dictionaries
f=@(i) {dictionary(["key"+i], {i})} A = dictionary(f(1), f(2)); A(f(3)) = f(4) B = dictionary(f(5), f(6)); B(f(7)) = f...

5 days ago | 0

Answered
How to Interpolate and Find X given Y
Here's yet another approach that uses linexlines2D, downloadable from, https://www.mathworks.com/matlabcentral/fileexchange/934...

6 days ago | 0

Answered
How to Interpolate and Find X given Y
One way: x = [50 43 35 22 15 12 11 10 8.5 6.5 5.75 5 4 3 2.75 2.5 2.25 2 1.67 1.37 1.2 1 0.7 0.55 0.3 0.25]; y = [0.3 0.35 0...

7 days ago | 0

| accepted

Answered
Issues with overlapping graphs in nested tiledlayouts
Remove the line nexttile(t_lrg) It creates an axes in the outer layout.

7 days ago | 0

| accepted

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 ;

9 days 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...

10 days ago | 0

| accepted

Submitted


Further tools for analyzing objects in N-dimensional images
A collection of tools to supplement bwpropfilt, bwareaopen, and the like.

11 days ago | 1 download |

5.0 / 5

Submitted


Fit polyshape to objects in image
Given a 2D binary or label image of a number of objects, returns a "best-fit" polyshape to the boundaries of the objects.

11 days ago | 4 downloads |

0.0 / 5
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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...

11 days ago | 0

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

12 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...

15 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...

15 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)+...

15 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...

17 days ago | 1

| accepted

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: ...

18 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,...

18 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...

19 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...

21 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...

21 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...

21 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...

22 days ago | 0

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