David Winthrop
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MATLAB user for several years. Professional Interests: Image processing,
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Awarded to David Winthrop on 27 May 2021
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Feeds
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. ...
alrededor de 2 años hace | 0
| aceptada
Pregunta
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...
alrededor de 2 años hace | 3 respuestas | 0
3
respuestasPregunta
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,'%...
alrededor de 2 años hace | 1 respuesta | 0
1
respuestaPregunta
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...
alrededor de 3 años hace | 1 respuesta | 0
1
respuestaPregunta
Strange results from unique
I recently encountered a strange result that defies explanation. I took a screenshot. How can this be? <</matlabcentral/answe...
más de 3 años hace | 1 respuesta | 0
1
respuestaPregunta
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...
casi 4 años hace | 0 respuestas | 0
0
respuestasPregunta
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 ...
alrededor de 4 años hace | 1 respuesta | 0
1
respuestaPregunta
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...
alrededor de 4 años hace | 1 respuesta | 0
1
respuestaHow 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!
alrededor de 4 años hace | 1
How to arrainge data to use streamline?
Bumping in the hopes that someone can help.
casi 5 años hace | 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...
casi 5 años hace | 0
Pregunta
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...
casi 5 años hace | 3 respuestas | 0
3
respuestasPregunta
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...
casi 5 años hace | 0 respuestas | 0
0
respuestasPregunta
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 ...
casi 5 años hace | 0 respuestas | 0
0
respuestasPregunta
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...
casi 5 años hace | 0 respuestas | 0
0
respuestasPregunta
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 ...
alrededor de 5 años hace | 1 respuesta | 0
1
respuestaAlternatives 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...
alrededor de 5 años hace | 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...
alrededor de 5 años hace | 0
Pregunta
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 ...
alrededor de 5 años hace | 4 respuestas | 0
4
respuestasPregunta
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...
más de 5 años hace | 1 respuesta | 0
1
respuestaPregunta
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...
más de 5 años hace | 1 respuesta | 1
1
respuestaPregunta
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...
más de 6 años hace | 1 respuesta | 0
1
respuestaPregunta
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 ...
más de 6 años hace | 1 respuesta | 0
1
respuestaPregunta
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...
alrededor de 7 años hace | 1 respuesta | 0
1
respuestaHow 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...
alrededor de 7 años hace | 0
Pregunta
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...
alrededor de 7 años hace | 0 respuestas | 0
0
respuestasPregunta
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...
alrededor de 10 años hace | 3 respuestas | 0
3
respuestasPregunta
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...
más de 11 años hace | 0 respuestas | 0
0
respuestasPregunta
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) ...
casi 12 años hace | 0 respuestas | 1
0
respuestas
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