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Johannes Korsawe


Last seen: 4 days ago Active since 2012

I am a mathematician at the Volkswagen AG and working with MATLAB since ~1998.

Professional Interests: fem, geometrical computations

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Question


Find values in list that appear exactly once
Hi there, assume, i have a list of integer values. I need a fast way to find those values in the list, that appear exactly on...

4 years ago | 1 answer | 0

1

answer

Answered
How to add two sparse matrices or ndSparse matrices in MATLAB?
help sparse fourth and fifth argument of sparse prescribe the dimensions. If you know them from the beginning of ayour code, ...

5 years ago | 0

Answered
Neighbors of a pixel
Let A be your matrix. % use the help of a bigger matrix B=nan(size(A)+2); B(2:end-1,2:end-1)=A; % pre-define memor...

5 years ago | 2

| accepted

Answered
How to view Matlab standalone application errors?
Some thoughts: - use the MATLAB var "isdeployed" to insert some debug infos for deployed applications that do not bother you ...

5 years ago | 0

Answered
volume or point detection in a non-convex polyhedron
The submission intriangulation may serve your needs. <https://www.mathworks.com/matlabcentral/fileexchange/43381-intriangulat...

5 years ago | 1

Answered
Matlab GUIDE: how to deal with multiple overlapping panels
It IS possible to do it via on/off. But then you will have to place all panels above each other which makes it not so nice to e...

5 years ago | 0

Question


Why is the rectangle command so much slower on the new graphics engine?
Hi folks, i am just comparing the performance in plotting a lot of filled circles via the rectangle command. My benchmark is ...

5 years ago | 1 answer | 0

1

answer

Answered
Determining toolbox dependency of a series of scripts
Jakob, i am also struggling with that functionality. The short answer is: There is no functional command in Matlab that wi...

5 years ago | 1

Question


Alphashape calculated with points and triangles
Hi there, another alphaShape related question: If i do not only have a point cloud, but if i also have some triangulation of ...

6 years ago | 0 answers | 0

0

answers

Question


Find midpoints of alphashape's defining spheres
Hi there, if i compute a 3d-alphashape on a pointcloud...is it possible to find the midpoints of those spheres, which are def...

6 years ago | 1 answer | 0

1

answer

Question


Screen is flickering at Matlab startup for 2014b
Dear all, i had a change of my computing device three weeks ago and i was and am using Matlab R2014b on the new and old machi...

6 years ago | 2 answers | 0

2

answers

Question


Output of REAL filled circle from figure
Dear all, my question refers to Matlab R2014b. (1) I want to plot a number of filled circles with varying diameters into ...

6 years ago | 0 answers | 0

0

answers

Answered
What handle graphics objects have an empty 'Children' property in MATLAB R2014b?
And how to make filled contours semi-transparent? Contour object can either be filled or not, but there is no such thing as Face...

6 years ago | 2

Question


R2014b: How to make the filled areas in contourf semi-transparent?
(At least) in Release 2014b, the contourf - command returns a Contour object, which may be filled or not, but there is no such t...

6 years ago | 1 answer | 0

1

answer

Question


Integrate angular velocity for Newton/Euler equations for single body under force load
Hi folks, i have the following task to solve: i want to calculate the point reaction forces of a body under arbitrary load of so...

7 years ago | 0 answers | 0

0

answers

Answered
Usings subs on matrices ?
C(C==exp1) = exp2; ??

8 years ago | 0

Answered
How to plot in GUI from obtained values?
Use the handles structure and the built-in function guidata: function xls_read_button_Callback(hObject, eventdata, ...

8 years ago | 0

Answered
inpolygon equivalent function in 3D?
Try intriangulation on the FEX. Regards, Johannes

8 years ago | 0

Answered
How to merge 2 different 3-D surface patch objects (Faces & Vertices) in 1 patch object with ONLY the outside surface (inside points removed)
Not an answer, but a comment. I also tried to solve this problem with several steps: 1. Determine the inside/outside poin...

8 years ago | 0

Answered
Determining if a point is inside an triangulated 3D closed surface
Use intriangulation from the FEX. Regards, Johannes

8 years ago | 1

| accepted

Answered
How to find elements of a 3d matrix inside a volume
If your volume is tesselated with triangles and watertight, you might be able to use intriangulation from the FEX. Regards, ...

8 years ago | 0

Answered
Whether a given point is inside or outside a non-convex 3D tessellated (triangular mesh/ STL file) object?
If the tesselated surface is watertight and consists of triangles only, you can use intriangulation from the FEX. Regards, J...

8 years ago | 0

Answered
Get a smothed outer surface from a 3D set of points with points that are inside the wanted surface
Reza, you gave the answer yourself. The first step is to get rid of those points that are inside the volume. There is also a ...

8 years ago | 0

Question


Find out OS language via datestr command?
Hi folks, i wonder if the datestr command can help finding out the operating system's basic language. I can only test the ...

8 years ago | 3 answers | 1

3

answers