Community Profile

# David Winthrop

##### Last seen: 7 days ago
21 total contributions since 2013

MATLAB user for several years.
Professional Interests: Image processing,

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How to arrainge data to use streamline?
Bumping in the hopes that someone can help.

7 days ago | 0

How to arrainge data to use streamline?
I tried to use griddata but there are some results that MATLAB can't seem to find, such as the re-circulation zones. Here is th...

8 days ago | 0

Question

How to arrainge data to use streamline?
Hello, I have data exported from a finite element software that I want to use in MATLAB to plot streamlines. The format is x...

9 days ago | 3 answers | 0

### 3

Question

Robust way to calculate volume of a 3D polygon given a triangulation
I am looking for a way to calculate the volume of this shape. I export this shape to a professional finite element software wh...

21 days ago | 0 answers | 0

### 0

Question

English explanation of the predopt argument to polyconf?
Hello, I am trying to understand the documentation for polyconf and the MATLAB explanation is not clear. It says options other ...

1 month ago | 0 answers | 0

### 0

Question

Trouble triangulating a surface
I have attached a text file with the data I am discussing. I need to triangulate this data so that I can write the triangulatio...

3 months ago | 0 answers | 0

### 0

Question

Why is dsolve returning an arbitrary constant?
I have the following differential equation I want to solve from a simple harmonic motion problem. When I enter this into ...

3 months ago | 1 answer | 0

### 1

Alternatives to Delaunay triangulation
Thanks everyone! I found a file exchange function that does a very nice job of displaying the mesh so that it matches the mes...

4 months ago | 0

Alternatives to Delaunay triangulation
I have attached the point cloud as a file Coords.txt. Below is the code I use to plot it. I have found that the boundary code wo...

4 months ago | 0

Question

Alternatives to Delaunay triangulation
Hello, I am in need of calculating the volume of a shape that is given as a cloud of points. I thought a first step would be ...

4 months ago | 4 answers | 0

### 4

Question

Obscure vector function translation from fortran
I have been tasked with translating some code into MATLAB. I am puzzled at this function. It is from a FEA software called ANSYS...

8 months ago | 1 answer | 0

### 1

Question

How to create a spline for data without sorting?
Hello, I have some data that represents trajectories through the 2D plane. My requirements: I need a pchip type spline to i...

10 months ago | 1 answer | 0

### 1

Strange error with DAQ

2 years ago | 0

Question

Strange error with DAQ
This makes absolutely no sense to me. I recently "upgraded" to r2017b from r2016a on this computer, and now my DAQ doesn't work...

2 years ago | 1 answer | 0

### 1

Question

This makes no sense to me whatsoever. MATLAB will not read the requested data from the file even though it reads the same data ...

2 years ago | 1 answer | 0

### 1

Question

How can a show the correct view of graphical objects??
I am trying to make an animation, and I noticed that the camera DOES NOT show what it should show. How can I fix this? I mak...

2 years ago | 1 answer | 0

### 1

How can a show the correct view of graphical objects??
Since I have asked this question twice and nobody has commented, I think it is safe to assume nobody knows or it is a bug nobody...

2 years ago | 0

Question

Why don't Axes camera properties seem to work?
I don't understand how the camera properties of the axes work. For example, say I draw a unit circle in the plane and put the c...

2 years ago | 0 answers | 0

### 0

Question

I am trying to connect a capacitor in my system and it will not connect to anything. Here is a picture. The wires stay red alw...

5 years ago | 2 answers | 0

### 2

Question

Why would chol fail?
I have a positive definite sparse array. When I do the chol like L = chol(M,'lower') M2 = (L)*(L.') I find that M...

7 years ago | 0 answers | 0