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David Winthrop


Last seen: mer än ett år ago |  Active since 2013

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

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Answered
Strange output from symbolic calculation
I figured out what was going on. It seems the sym interpreter was giving a rational approximation for pi only some of the time. ...

mer än ett år ago | 0

| accepted

Question


Strange output from symbolic calculation
Can someone explain this output (in particular, the numbers) syms f0 T t0 Omegan t n subs(2*f0*pi^2/(Omegan*T*(- Omegan^2*t0^2...

mer än ett år ago | 3 answers | 0

3

answers

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How can I get txtscan to read this file?
I tried this but it only seems to have read the first line. There are tabs between columns, I believe. G = textscan(F,'%...

mer än ett år ago | 1 answer | 0

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answer

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How to stop display of variable type in command window?
Hello, When I type >> pi==pi ans = logical 1 I do not want to see the word "logical" there. How can I suppress th...

mer än 2 år ago | 1 answer | 0

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answer

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Strange results from unique
I recently encountered a strange result that defies explanation. I took a screenshot. How can this be? <</matlabcentral/answe...

nästan 3 år ago | 1 answer | 0

1

answer

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Warning('OFF','all') does nothing?
In my code I put: warning('OFF','all') and then I read some images and display them in a figure from within a loop. Every sin...

mer än 3 år ago | 0 answers | 0

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How to extract audio from mp4 video file with Matlab?
I have a video file and I want to extract the video and audio into separate objects for writing to disk separately. I know how ...

mer än 3 år ago | 1 answer | 0

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Option to turn off variable type display
I would like to know how to get rid of the line that tells me what type of variable is. This wasn't there in earlier releases bu...

mer än 3 år ago | 1 answer | 0

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Answered
How do I get rid of the suggestions/help popup in the command window in Matlab 2014b?
This does not work in R2018a with Ubuntu. Is there anything else that can be done? That little popup window is very annoying!

mer än 3 år ago | 1

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

ungefär 4 år 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...

ungefär 4 år ago | 0

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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...

ungefär 4 år ago | 3 answers | 0

3

answers

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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...

ungefär 4 år ago | 0 answers | 0

0

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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 ...

mer än 4 år ago | 0 answers | 0

0

answers

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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...

mer än 4 år ago | 0 answers | 0

0

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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 ...

mer än 4 år ago | 1 answer | 0

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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...

mer än 4 år 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...

mer än 4 år ago | 0

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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 ...

mer än 4 år 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...

nästan 5 år ago | 1 answer | 0

1

answer

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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...

ungefär 5 år ago | 1 answer | 1

1

answer

Answered
Strange error with DAQ
Bumpers. Please help!

ungefär 6 år ago | 0

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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...

ungefär 6 år ago | 1 answer | 0

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answer

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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 ...

ungefär 6 år ago | 1 answer | 0

1

answer

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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...

mer än 6 år 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...

mer än 6 år ago | 0

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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...

mer än 6 år ago | 0 answers | 0

0

answers

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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...

mer än 9 år ago | 3 answers | 0

3

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...

ungefär 11 år ago | 0 answers | 0

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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) ...

ungefär 11 år ago | 0 answers | 1

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