# Johannes Korsawe

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...

ungefär 4 år ago | 1 answer | 0

### 1

answerHow 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, ...

nästan 5 år ago | 0

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...

nästan 5 år ago | 2

| accepted

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 ...

nästan 5 år ago | 0

volume or point detection in a non-convex polyhedron

The submission intriangulation may serve your needs. <https://www.mathworks.com/matlabcentral/fileexchange/43381-intriangulat...

nästan 5 år ago | 1

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...

ungefär 5 år 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 ...

mer än 5 år ago | 1 answer | 0

### 1

answerDetermining 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...

mer än 5 år 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 ...

nästan 6 år ago | 0 answers | 0

### 0

answersQuestion

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...

nästan 6 år ago | 1 answer | 0

### 1

answerQuestion

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...

mer än 6 år ago | 2 answers | 0

### 2

answersQuestion

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 ...

mer än 6 år ago | 0 answers | 0

### 0

answersWhat 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...

mer än 6 år 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...

mer än 6 år ago | 1 answer | 0

### 1

answerQuestion

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...

nästan 7 år ago | 0 answers | 0

### 0

answersHow to plot in GUI from obtained values?

Use the handles structure and the built-in function guidata: function xls_read_button_Callback(hObject, eventdata, ...

nästan 8 år ago | 0

inpolygon equivalent function in 3D?

Try intriangulation on the FEX. Regards, Johannes

ungefär 8 år ago | 0

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...

ungefär 8 år ago | 0

Determining if a point is inside an triangulated 3D closed surface

Use intriangulation from the FEX. Regards, Johannes

ungefär 8 år ago | 1

| accepted

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, ...

ungefär 8 år ago | 0

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...

ungefär 8 år ago | 0

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 ...

ungefär 8 år 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 ...

mer än 8 år ago | 3 answers | 1