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

7 days ago | 0

Answered
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

answers

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

answers

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

answers

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

answers

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

answer

Answered
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

Answered
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

answers

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

answer

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

answer

Answered
Strange error with DAQ
Bumpers. Please help!

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

answer

Question


MATLAB r2016b problem with cvsread
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

answer

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

answer

Answered
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

answers

Question


simulink connecting capacitor problem
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

answers

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

0

answers

Question


ODE45 to solve non-time function
I would like to use ode45 to solve the following D.E. T'' + (1/x)*T' + G = 0 T'(x=0) = 0 k*T'(x=.5) + h*(T(x=.5) ...

7 years ago | 0 answers | 1

0

answers