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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 do I perform Image segmentation in an RGB image using pattern?
load Image [r,g,b]=imsplit(I); lev=multithresh(r,2); L=imquantize(r,lev); H=bwareafilt( imfill(L==2,'holes') ,1) ; BG= ...

8 hours ago | 0

Answered
Curve fitting confidence intervals - discrepancy in manual CI plot and predint plot
Also, what is predint and how is this different from manually plotting the CIs as I did? predint predicts an uncertainty inter...

1 day ago | 0

Answered
How to preserve the 3d plot box, when changing patch visibility.
Here's something a little fancier, and maybe more robust. It captures (and reasserts) all relevant properties of the plot perspe...

4 days ago | 1

| accepted

Answered
How can I quickly find the eigenvalues and eigenvectors of a matrix with a special structure using high-precision calculations?
@Torsten has hinted, based on your earlier posts, that the eigenvalues of M may occur in distinct and purely imaginary conjugate...

4 days ago | 0

Question


Indexing behavior of table properties
Suppose we have a table such as, T=table(rand(3,1,'single'), randi(5,3,1)) What is it that allows the VariableTypes to be in...

5 days ago | 1 answer | 1

1

answer

Answered
How to preserve the 3d plot box, when changing patch visibility.
Using axis() twice, we can both capture and reassert the axis limits, axis(axis) This also then converts all X,Y,ZLimModes to ...

6 days ago | 0

Answered
How can I force a .txt export
Instead of, if length(file) < 4 || ~strcmpi(file(max(1,end-3):end), '.txt') file = [file '.txt']; end use ...

9 days ago | 0

Answered
Extracting from cell arrays using a nested loop
Do not use a nested loop: clear Data for k=250:-1:1 Data(:,k,:) = Matrix(zapTime(k)-12000:zapTime(k)+75000, 2:end) ); end...

12 days ago | 0

Answered
How to draw the axis in the origin of the coordinate system?
Use export_fig instead, https://www.mathworks.com/matlabcentral/fileexchange/23629-export_fig

15 days ago | 1

Answered
Restore data format from SCB to SSCB after patch embedding
One way is to use a functionLayer.

15 days ago | 0

Answered
Error forming mini-batch for network input
This is not enough to reproduce the error. You haven't provided input images. My guess, however, is that there are some files in...

15 days ago | 2

Answered
Having 'imdilate' function only proceed when there are not a bunch of zero values
Don't use a loop. Use imreconstruct instead

15 days ago | 0

Answered
How do I find if a point is within the volume of a rotated ellipsoid
Download AxelRot from here, https://www.mathworks.com/matlabcentral/fileexchange/30864-3d-rotation-about-shifted-axis?s_tid=src...

15 days ago | 0

Question


Resetting a memoized function
I know that clearCache will clear the cache of a MemoizedFunction, but how would you reset its other properties to their default...

20 days ago | 2 answers | 0

2

answers

Answered
Deconvolution using FFT - a classical problem
Since you are trying to deconvolve in the presence of noise, it would make sense to use a regularized deconvolver like deconvreg...

24 days ago | 0

| accepted

Answered
Morphological Image Processing: Object Identification and Separation
This might be along the lines of what you're looking for. It's semi-empirical though in the way it discards particles. Maximum d...

25 days ago | 1

| accepted

Answered
Deconvolution using FFT - a classical problem
dt=0.001; N=20/dt; t= ( (0:N-1)-ceil((N-1)/2) )*dt; %t-axis u=(t>=0); g=3*exp(-t).*u; y=conv(g,u,'same')*dt; Y = fft...

25 days ago | 0

Answered
How do I start using MATLAB Copilot?
The Matlab AI Co-pilot is an add-on product. It will not be part of your Matlab installation unless you've bought a license for ...

26 days ago | 0

Question


Parsing mfunctions with mtree
Given an Nx1 colum vector of strings containing lines of mfunction code, it is possible to use the undocumented function mtree()...

29 days ago | 1 answer | 1

1

answer

Answered
Where is the Save icon (not Save As) in a figure (.fig) R2025b Matlab
There is no separate Save icon applicable to figures. I think only the Editor has ever had that.

30 days ago | 0

Answered
Determine which delaunayTriangulation Constraints correspond to input constraints?
If you convert the final triangulation to a graph, then it seems to me that shortestpath should give you the intermediate nodes ...

1 month ago | 0

Answered
Adding a dropdown box for the variable unit BESIDE the variable
Sure. For example,

1 month ago | 0

| accepted

Question


Appdesigner labels linked to components
It appears to me that text labels in AppDesigner canvases have two types: labels that are standalone, independent of any compo...

1 month ago | 1 answer | 0

1

answer

Answered
Pass commands to executable run through system command
Perhaps as follows? In1 = '1'; In2 = 'C:/Dir1/File1.dat'; In3 = '02/09/2026 16:00'; In4 = '0.5'; cmd = sprintf('C:/Dir2/m...

1 month ago | 0

Answered
When I use nlinfit, the sintax nlinfit(t0,p0 ,@(b,t) ...),but if Ireplace nlinfit with fmincon, the sintax is not valid, why?
Because it is a different function. The syntax of fmincon is documented here, https://www.mathworks.com/help/optim/ug/fmincon.h...

1 month ago | 0

| accepted

Answered
does installing toolbox that has different version than your matlab program cause a problem
Yes. I don't think it's even possible to install a toolbox version that doesn't match your core Matlab version.

1 month ago | 0

Answered
Why is the menu bar background white?
You could also upgrade to R2025. There, the menu bar is grey (or at least not as white) and you can also render figures in da...

1 month ago | 0

Answered
Why is the menu bar background white?
especially when you develop a code with a GUI For GUIs, you can use uimenu, which still produces a grey menu bar.

1 month ago | 0

Answered
Calculate mean and standard deviation from 30-years of global wind data
This might be what you are looking for, subs=[lat(:),lon(:),year(:)]; val=wind(:); siz=[180,360,30]; meanWind = acummarray...

2 months ago | 0

| accepted

Answered
Install and work with ResNet-50 Network pretrained
Install by opening deepNetworkDesigner and selecting ResNet-50 You can then use imagePretrainedNetw...

2 months ago | 0

| accepted

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