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Matt J


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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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Réponse apportée
Saving large mat-files 2-4 GB takes 1 or 2 min. how to do things in paralell?
See Run Functions in Background. You might also consider storing directly in HDF5 using h5create and h5write. It is essentially...

environ 19 heures il y a | 0

Réponse apportée
Sequential neural network training with 1-D function layer
You could try islocalmax instead, if a mask of the maxima locations is sufficient.

1 jour il y a | 0

| A accepté

Réponse apportée
Can Same Commands in Debugger and Command Window Exhibit Different Behavior?
I suspect the only reason size() reports that foo is 1x2 in the first place is because size() is overloaded by class sym to do s...

2 jours il y a | 0

| A accepté

Réponse apportée
Improving my forwardfill call
A = [0.1 0.2 0.3 NaN NaN NaN 0.7 NaN 0.9 1] A_ffilled = forwardfill(A,1) A_ffilled = forwardfill(A,2) EDIT: function [B,...

6 jours il y a | 0

| A accepté

Réponse apportée
Transparency of background in MATLAB figure
Use export_fig, https://www.mathworks.com/matlabcentral/fileexchange/23629-export_fig with the "-transparent" flag.

7 jours il y a | 1

| A accepté

Réponse apportée
Lake America used as a name in Mapping Toolbox
I need to know if, like how I now view Google Earth/Maps and Alphabet Inc, I need to inject a level of mistrust and loss of resp...

9 jours il y a | 0

Réponse apportée
Any quick fix for this matrix-scalar simplification?
Here's one approach. Limitation: all matrices in the expression must be explicit variables with names that can't end with number...

9 jours il y a | 1

Réponse apportée
pinv function is supported for dlarray input while the pageinv function is not supported
If your inputs to the operation will always be a 3x3XN stack, as in your example, then you can use the code below in conjunction...

12 jours il y a | 0

Question


functionSignatures.json for built-in functions
I would like to define code suggestions/completions for built-in Matlab functions. This document, https://www.mathworks.com/hel...

12 jours il y a | 1 réponse | 0

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réponse

Réponse apportée
How to modify Find Files GUI file size threshold
After consulting Tech Support, I have learned that the field will re-enable if non-empty text is entered into the "Find Files co...

14 jours il y a | 1

| A accepté

Question


How to modify Find Files GUI file size threshold
In the "Find Files" GUI there is a "Skip files over" field that sets an upper limit on the file size to include in the search. F...

16 jours il y a | 1 réponse | 0

1

réponse

Réponse apportée
How Can Short-Circuiting Logical Operators &&, II be Overloaded in a Classdef?
You can't overload && or || directly. It would make their common usage less efficient if the parser had to check the class of al...

17 jours il y a | 0

| A accepté

Réponse apportée
anonymous function with rng call inside
rng('default') T= rand(1,10); t=1:15; T(ceil(t/10)) ans = Columns 1 through 9 0.8147 0.8147 0.8147 ...

18 jours il y a | 0

Réponse apportée
anonymous function with rng call inside
function y=f(t) rng(ceil(t/10)); y=rand(1); end

18 jours il y a | 0

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Neural Network with custom performance function
If you are using trainnet, the lossFcn input argument lets you supply a custom loss function explicitly, https://www.mathworks....

21 jours il y a | 0

Réponse apportée
Histogram gives a wrong result?
Due to the floating number? Correct. There is no reason to expect exact boundaries, or for data to fall exactly within those bo...

22 jours il y a | 0

Réponse apportée
Get back find in files interface from before 2025b
This search and replace app from the File Exchange might be worth considering as a possible substitute, https://www.mathworks.c...

environ un mois il y a | 0

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Is delegated or department-level license administration possible?
If not, how are other universities or large organizations handling this? It's horrendous. Every time I want to upgrade my Matla...

environ un mois il y a | 0

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Help with this triple nested for loop
I don't know what you're trying to do with Ux, but U is just, U = cat(3, ... repelem(cat(3,A1,A2,A3,A4),1,1,6), ... r...

environ un mois il y a | 0

| A accepté

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Classdef Static method calling builtin subsref instead of classdef subsref
With the newer modularized indexing, the overloaded indexing will be active inside the classdef. So, one option is to overload y...

environ un mois il y a | 0

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Plotting fit lines on multiple sets of data in one plot - how to limit each of the fit lines start and end points?
From the documentation: plot(cfit,x,y) plots cfit together with a scatter plot of the data in x and y. The axes limits are give...

environ un mois il y a | 0

Réponse apportée
fmincon solver for nmpc applications
FMINCON's sqp algorithm does not accept a HessianFcn parameter. You would need to switch to either trust-region-reflective or in...

environ un mois il y a | 0

Réponse apportée
Can I return the xml string from writestruct?
You can't suppress file output, but you can use readlines and writelines to retrieve the file contents in string form and then m...

environ un mois il y a | 0

| A accepté

Réponse apportée
Handling outliers in Spray Angle calculations
This is one way you might clean things up: fnames={dir('*.bmp').name}; Bcell=cellfun(@cleanUp,fnames,'uni',0); tiledlayout(...

environ 2 mois il y a | 1

Réponse apportée
Graceful exit from a parfor loop
It sounds like a job for onCleanup.

environ 2 mois il y a | 1

| A accepté

Question


gpuArray support for Optimization Toolbox solvers
I have wondered for a while why the OptimizationToolbox doesn't currently support gpuArray data types in its solvers (lsqnonlin,...

2 mois il y a | 1 réponse | 2

1

réponse

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Input image rescaled to 0-1 using im2single for ImageNet models, will that result in wrong outputs?
Yes, probably. For all of these networks, the input layer normalization settings are 'zerocenter', which is not a scale invarian...

2 mois il y a | 0

| A accepté

Question


Sparse gpuArray indexing limitations
When trying to extract a sub-matrix of a sparse gpuArray, I get, >> S=gpuArray(sprand(100,100,0.1)); >> S(1:5,1:5) Sparse gpu...

2 mois il y a | 2 réponses | 0

2

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Réponse apportée
Pagemldivide returns incorrect results for complex gpuArrays
Looks like a bug to me. I would report it. Test Data Acpu=randn(20,10,2)+1j*randn(20,10,2); Bcpu=randn(20,10,2)+1j*randn(20,1...

2 mois il y a | 0

| A accepté

Question


Does A(m:n) trigger the explicit creation of an index array (m:n)?
I was under the impression that in an indexing expression A(m:n) when A is a numeric vector, Matlab was smart enough to optimize...

2 mois il y a | 1 réponse | 0

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