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Sean de Wolski


MathWorks

5,500 total contributions since 2004

I like to be outside. But if I'm inside, I like to be using MATLAB.

I'm an Application Engineer at MathWorks and civil/structural engineer by education.

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Answered
How to Retrieve Files from Lost/Stolen Computer
<https://www.mathworks.com/products/matlab-drive.html>

3 days ago | 0

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WINNER and WINNER II
Idin‘s pick this week is Winner II Channel Model for Communications Toolbox by MathWorks Communications System Toolbox...

3 days ago

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Answered
any workaround for deploying applications allowing users to define custom functions?
If they want it to be customizable, then they need a MATLAB license and you can just give them the source code for the app so ad...

5 days ago | 0

Answered
neural network hyperparameter tuning
This is nowhere near as easy as it should be. The shallow neural net infrastructure is old and uses row-major variables. This ...

6 days ago | 0

Answered
How to unit test with verifyError?
verifyError(testCase, @()add5('c'), 'add5:InputMustBeNumeric') Pass the function handle into verifyError rather than a res...

6 days ago | 1

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Zombie Outbreak
Sean‘s pick this week is Mathematical modelling of an outbreak of zombie infection by E. Cheynet. In honor of Halloween, E....

10 days ago

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Dynamics of Rigid Bodies – Live Editor Challenge Winner (Faculty Category)
Jiro‘s pick this week is The dynamics of rigid bodies system by Anna Sibilska-Mroziewicz.Continuing from my last Pick,...

17 days ago

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‘Custom Syntax for Formatted Strings with %s’\{SPRINTF}
Greg’s pick this week is Nice sprintf syntax using \ (left divide) by Will Fox. A simple entry that exemplifies the...

24 days ago

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Answered
I'm trying to subtract the day from the datetime
dateshift(dt, 'start', 'month') There will still be a day associated with it but it would be standardized on first day of m...

25 days ago | 0

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Published


EDF Read
Sean‘s pick this week is edfRead by Brett Shoelson. EDF Read A MATLAB user asked me yesterday if we have support for the...

1 month ago

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How get row index of first and last appearance each unique cell element
Unique is your friend: x = ["MUY09KT00" "TW00.00" "MUY09KT00" "TW00.00" "MUY09KT00" "TW00.00" "MHJ09KT00" "P...

1 month ago | 0

Answered
S Function Builder - To implement existing C code
If you're using 18b, consider using the C Caller block: <https://www.mathworks.com/help/releases/R2018b/simulink/ug/integrate...

1 month ago | 1

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Answered
Parsing varargin for a function called with values only instead of name-value pairs
I like name-value pairs because it makes it easier to extend in the future if you need a new option. With the ability to have a...

1 month ago | 0

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Answered
regexp find next char
Use string arrays! >> a = string('A = p:\A to B\Mat Lab\Ques Tion\') a = "A = p:\A to B\Mat Lab\Ques Tion\" >...

1 month ago | 0

Published


Handle Classes – Live Editor Challenge Winner (Student Category)
Jiro‘s pick this week is Building a Forest of Trees in MATLAB by Ameer Hamza.Today, I’d like to highlight the winner of...

1 month ago

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Answered
Cumulative sum with conditions
h = [1 0 0; 1 1 0; 0 0 1; 1 1 1; 0 1 0]; s = sum(h, 2).*~h(:,end) requiring the last element to be...

1 month ago | 0

Answered
Matlab Histogram: connecting bin centers to make a curve
I recommend using the newer histogram rather than hist. x = randn(100,1); h = histogram(x); hold on plot(conv(h.BinEdges...

1 month ago | 2

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Answered
Longest Sequence of 1s
<https://www.mathworks.com/help/releases/R2018b/images/ref/bwareafilt.html> biggest = bwareafilt(x, 1) If x is a char ar...

1 month ago | 0

Answered
dtw example from MatLab Documentation doesn't not work
The second occurrence is the one you want. Rename the first file to something else.

2 months ago | 0

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Published


ShakespeareInsult
Will‘s pick this week is ShakespeareInsult by Jos (10584). Shall I compare thee to a summer’s day? Or perhaps something...

2 months ago

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Unzipping a uint8 array
Use websave instead: tempzipname = [tempname '.zip'] websave(tempzipname, url); deleter = onCleanup(@()delete(tempzipname...

2 months ago | 0

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R2018b Features
Sean‘s pick this week is my biannual review of former picks that are now part of the product. R2018b shipped last week...

2 months ago

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Answered
How to batch convert table columns to categorical
In 18b there is a convenience function to do exactly this: <https://www.mathworks.com/help/releases/R2018b/matlab/ref/conve...

2 months ago | 1

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Physics Course Live Scripts using Symbolic Math Toolbox
Jiro‘s pick this week is Physics Course Live Scripts using Symbolic Math Toolbox by Kurt Braeuer.My day job is helping our...

2 months ago

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Matlab doesn't import standard python modules, when importing a custom python module
Please also note that the ability to use resnet and train/transfer deep networks is available in MATLAB in the <https://www.math...

2 months ago | 0

Published


Path Simplification (and Binary Image Reconstruction!), Made Easy
Contents Sample Path Enter the Douglas-Peucker algorithm: Mask reconstruction I’ve been thinking a lot about how to...

2 months ago

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Safer Semaphore
Sean‘s pick this week is Safer wrapper for Windows-API Semaphore by Igor. A while back, I wrote a blog post about the...

2 months ago

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Answered
How can I create paths relative to a specific folder to facilitate moving project folders to other locations?
|mfilename('fullpath')|, |fullfile|, |fileparts|, |pwd| are my best friends for this type of work.

3 months ago | 0

Answered
Toolboxes unavailable in Matlab
Contact MathWorks' installation support.

3 months ago | 0

Answered
get classifier name function
|getclassifiername| is defined as a local function in the function you linked to. I.e. it can only be called from within that f...

3 months ago | 0

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