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Sean de Wolski


MathWorks

5,568 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
Is it possible to organize parfor outputs based on the "thread" number?
parfor ii = 1:10 t = getCurrentTask disp(t.ID) end

1 day ago | 0

Answered
How to make a graph with nodes and edges
What version of MATLAB are you using? graph() was introduced in R2015b

2 days ago | 0

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Answered
turning legend off in xline function
myxline = xline(10,'r',"Hello") myxline.Label = "" myxline.DisplayName = "" Disable the label and/or DisplayName.

5 days ago | 1

Published


MATLAB Projects
Sean‘s pick this week is MATLAB Project File by Dmitry Ratner and the new Projects functionality in base MATLAB added to...

5 days ago

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Answered
How can I average datetimes of my array?
Look at the retime() function for a timetable.

6 days ago | 0

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MATLAB Grader Test (Assessment) Generator
Jiro‘s Pick this week is MATLAB Grader Test Generator by Robin T. Bye.MATLAB Grader is a web service product available for...

12 days ago

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Answered
How to remove artifact (“shadow” causing blurry areas) from 3D CT-data
I'd use a multipass set of global and adaptive thresholds. You can adjust the sensitivities and thresholds as necessary. I = i...

15 days ago | 0

Published


Do You Find Yourself Searching for Connection (in Simulink)?
Greg’s pick this week is slQuery by Robert Rasche. Robert has created an impressive mechanism for finding and operating on...

19 days ago

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Answered
How to replace MATLABPOOL to PARPOOL ?
p = gcp; p.NumWorkers Will tell you the number of workers in the pool rather than matlabpool('size')

21 days ago | 0

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Answered
MAPPING TOOLBOX LAT/LON vectors are not strictly monotonically increasing, hence zi = interp2(LON,LAT,GAIN,loni,lati) ; gives me errors
Look at geointerp which properly projects lat/lon onto a plane so the interpolation values make sense.

23 days ago | 0

Published


Connectionist Temporal Classification Layer
Sean‘s pick this week is Connectionist Temporal Classification Layer by SergeyLA. A Custom Deep Learning Layer in the...

26 days ago

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Answered
Deep Q-learning
https://www.mathworks.com/help/releases/R2019a/reinforcement-learning/ug/q-agents.html

26 days ago | 1

Answered
How to access itemprop = "name" from within a data structure in HTML code using Matlab?
Using htmlTree, this is trivial: tree = htmlTree(fileread('yourfile.html')) div = tree.findElement('div') item = div.getAtt...

27 days ago | 0

Answered
Classdef get methods: allowing get indexing into an array of length either (1x1) or (Nx1).
You could GetAccess Protect the A property and then use a method instead of straight property reference. methods function a ...

27 days ago | 0

Published


Multi-column legend, revisited
Jiro‘s Pick this week is the NumColumns property of the legend function, new as of R2018a.This week, R2019a was...

1 month ago

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Given an instance of a class (without knowing class name), how to call the constructor?
Might you be interested in inheriting from matlab.mixin.Copyable which gives you a copy method?

1 month ago | 0

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Answered
AlphaShape: incorrect geometry
How about pointlocation?

1 month ago | 0

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Answered
How do i copy the content of a folder into another folder.
doc copyfile doc dir doc fullfile Use dir to get the file name and current path, fullfile to build the old and new full file ...

1 month ago | 0

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Answered
How to add a hyperlink of a pdf file within Simulink?
Insert a text box, a link, and then use MATLAB code with open('your_pdf_file.pdf')

1 month ago | 0

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Published


World Bank API Access
Sean‘s pick this week is World Bank API Access by Kim9091. Last year, I blogged about writing your own function...

2 months ago

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Answered
Undefined variable "vision" or class "vision.HoughTransform".
Do you have the computer vision system toolbox installed and licensed? ver

2 months ago | 0

Published


Get your key press
Jiro‘s pick this week is getkey by Jos.Here’s an entry from a long-time user. Honestly speaking, I’m surprised why this...

2 months ago

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Answered
Can you detect when a title is added to a plot?
If the axes already exists, this seems to work ax = axes addlistener(ax.Title,'String','PostSet',@(~, ~)disp('hi')) title('He...

2 months ago | 0

Answered
From char to timetable
How are you creating the char? Reading it from a file? If you're reading it from a file, then look at importing with fixed wid...

2 months ago | 0

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Published


HDL Coder Tutorial and Evaluation Reference Guide
Curie’s pick of the week is – actually, make that plural! My picks are the HDL Coder Tutorial and HDL Coder Evaluation...

2 months ago

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Answered
MQTT subscribe callback function not executed in AppDesigner
(This is a guess) When the function exits, the mObj and mySub are destroyed. Set them to be properties of the app (add propert...

2 months ago | 1

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Answered
Data Analysis advance filtering
Tested in R2018b. May need to convert strings to cellstrs in older releases. %% Sample data Data = array2table(rand(2,200))...

2 months ago | 0

Published


Beating (Cartoon) Heart
Sean‘s pick this week is Beating (cartoon) Heart by Nathaniel Barlow. In the spirit of celebrating Valentine’s day with...

2 months ago

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Answered
Undefined function or variable 'analyzeNetwork' error in transfer learning.
In 18a, you had to download it from the web I believe and then it came built in in 18b. Get it here https://www.mathworks.com/m...

2 months ago | 0

Published


Draggable Data Tips
Jiro‘s pick this week is DragDataTip by Allen.Here’s a simple, but quite useful utility to use in conjunction with...

2 months ago

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