# Sean de Wolski

### MathWorks

Actif depuis 2011

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

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

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currentProject() function in Parallel Computing Toolbox
You can open the project on all workers before the loop with parfevalOnAll. gcp rf = currentProject().RootFolder parfevalOnAl...

plus d'un an il y a | 2

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Why will categorical not convert this cell string?
The left-hand side was a cell. So it successfully converted the right-hand side to categorical but then could not stick the cat...

plus d'un an il y a | 0

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Smart indent new bheaviour (removing whitespaces) is messing with Git
This isn't a direct answer to your question but a couple ideas: 1) In my opinion, the new behavior is smarter. There shouldn't...

presque 2 ans il y a | 1

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Can Matlab append figures to an existing PDF file?
In newer releases you can do this with exportgraphics. See the section on appending.

presque 2 ans il y a | 0

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Creating Geometry for PDE model
What about the doc example isn't sufficient for you? It literally creates a rectangle. geometryFromEdges

presque 2 ans il y a | 0

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Capitalize 1st word of an character array
s = "99this" firstletter = letterBoundary("start")+lettersPattern(1) replace(s, firstletter, upper(extract(s, firstletter)))

presque 2 ans il y a | 0

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Can you rotate a shape based on quiver direction?
Look at hgtransform

presque 2 ans il y a | 0

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Find and Replace (MATLAB)
strip(extractAfter('Adak Island, AK',",")) And see the other fun methods of string to figure out how to manipulate the part you...

environ 2 ans il y a | 1

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Is there a built-in function to validate a class property that should be a cell array?
I think you'll have to write your own. Must be underlying type is for distributed, gpuArrays and others that masquerade as the ...

environ 2 ans il y a | 0

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How to vectorize the following operations?
This ought to do it for you in one shot. pagemtimes d = 4; n = 5; A = rand(d,d,n); x = rand(d,n); y = rand(d,n); % for-...

environ 2 ans il y a | 0

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How can I avoid errors related to a datatip when deleting a figure?
Not sure why you're parenting to [], that doesn't make sense. Just delete the figure with your MWE works fine. (Still probably...

environ 2 ans il y a | 0

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Create tables based on partial match in variable names in other table
Convert your cellstrs to strings string(t.Properties.VariableNames) Then you can use any of the easy string matching functions...

environ 2 ans il y a | 0

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which -all writematrix which -all mpower

environ 2 ans il y a | 0

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How do I pass by reference, a structure to a function (an .m file) in an argument list?
Author a simple handle class that has the structure as a property classdef referenceStruct < handle properties S s...

environ 2 ans il y a | 0

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How do I pass an object into a timer callback function?
Pass cam in with an anonymous function when you create the timer cam = camera t = timer(TimerFcn=@(~,~)checkFinished(cam)) ...

environ 2 ans il y a | 0

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Show viscircles results in App Designer
Specify the app UIAxes as the first input a = uiaxes; % replace with you app.UIAxes imshow('coins.png',Parent=a) [centers,rad...

environ 2 ans il y a | 1

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Extracting xyzpoints from Point Cloud
The location is the xyz points and it's 2d, not 3d like how you're indexing it. points3d = ptCloud.Location.'; Would give you...

environ 2 ans il y a | 1

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Creating tables on MS Word
This is exactly what the MATLAB Report Generator does really well. Look at the sections on tables and images, here: https://ww...

environ 2 ans il y a | 0

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How to publish as pdf from command tab
Open the function and go to the publish tab in the toolstrip. From there, click the dropdown under the publish icon for settings...

environ 2 ans il y a | 1

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Is it a good idea to overload subsref to mimic MATLAB's griddedInterpolant behavior?
Personally, i.e. not speaking for my corporate overlords, I don't like this design pattern. I prefer a well-named "evaluate" me...

plus de 2 ans il y a | 1

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How to fix auto-reflow issues?
In 21b you can remove autoreflow from the Canvas Tab>Convert. They named the feature to remove it after me because I was in the...

plus de 2 ans il y a | 0

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Why Matlab does not see Python?
Looks like you have 32-bit python. You need 64-bit Python.

plus de 2 ans il y a | 0

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Convert python numpy 2D array to matlab 2D array
What is the underlying python class of your ndarray? It doesn't seem to be recognized by double. Here, I create it with int8 a...

plus de 2 ans il y a | 1

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Using function of newer MATLAB version in older version
Sounds like you might be looking for wrapTo360 et al. in Mapping Toolbox: https://www.mathworks.com/help/releases/R2021b/map/re...

plus de 2 ans il y a | 0

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Create Text Box in PowerPoint file
All you have to do is set X/Y/Width/Height properties of the TextBox presentation element. See this example that does exactly w...

plus de 2 ans il y a | 0

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Call a MATLAB function from .NET program
https://www.mathworks.com/help/releases/R2021b/matlab/matlab_external/call-matlab-function-from-c-client.html

plus de 2 ans il y a | 0

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Generating an STL of a paraboloid surface made out of hexagons
1) yes 2) Look at stlwrite and triangulation.

plus de 2 ans il y a | 1

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surf indices reversed?
I think you're seeing the difference between meshgrid and ndgrid. Meshgrid is used for plotting, ndgrid for matrix/tensor work ...

plus de 2 ans il y a | 2

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Sending input() from Python API
This works if you start the MATLAB engine with the desktop: import matlab.engine eng = matlab.engine.start_matlab('-desktop'...

plus de 2 ans il y a | 0

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How can I iterate across the opposite diagonal?
full(flip(gallery('tridiag', 8, 4, 6, 4), 2))

plus de 2 ans il y a | 0