William Rose

Active since 2007

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12 Questions
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Answered
Remove echo (convolution) from an .mp3 audio file
@Valeria de los Angeles, I recommend using the autocorrelation function to estimate the echo effects, as @Walter Roberson said....

ongeveer 2 uur ago | 0

Answered
Issue with DAQ rms measurement variation with frequency
@Aaron Borgman, How exactly did you make these plots? PLease explain your sampling protocol and calculations in more detail. ...

1 dag ago | 0

Answered
How to solve a bvp PDE with split domain?
@Abdelrahman, Charles Peskin developed a method for handling moving boundaries in a fluid flow problem. Here's a link to one of...

1 dag ago | 0

Answered
Spatial filtering of cylindrical data
@Jim McIntyre, I think filtfilt() is a reasonable idea if you do what you said, which is add a wrap-around from the other part ...

3 dagen ago | 0

| accepted

Answered
how to solve 2DOF linear time variant differential equations in matlab with non-diagonal mass, stiffness and damping matrixes
@Elyar Ghaffarian Dallali, @Torsten has given a great answer with plots. Here is another way of looking at the problem - which ...

4 dagen ago | 1

Answered
Enhancing Graph Colorization for Visualizations in MATLAB
@salim, That looks like the hsv colormap. F = @(x,t)real(-0.7602345236*1i*sqrt(2) * csch(0.05376349*t - x) * exp(2.31182795*1i...

5 dagen ago | 1

Answered
how to determine the wavelengths of an fft of a non-dimensional sequence
@Andreas Baas, I agree with tyhe points made by @Matt J and @David Goodmanson. When the interval between samples (which could...

5 dagen ago | 0

| accepted

Answered
We have tetrahedra mesh we went to extract a sphere from this mesh and adabting the mesh
@Maroua Guenaoua, [Edit: Upload modified version of script - see comment below.] A modified version of your script is attached...

5 dagen ago | 0

Submitted

Analyze triangulation
This function returns information about a triangulation, which may be useful when setting up a partial differential equation pro...

6 dagen ago | 0 downloads |

0.0 / 5

Answered
We have tetrahedra mesh we went to extract a sphere from this mesh and adabting the mesh
@Maroua Guenaoua, I had to fixthe filename. You attached file nodes10.txt, but your code calls nodes10.dat. After I fixed tha...

18 dagen ago | 0

Answered
SVC CONTROL(detailed model)
@Xristina, The example description says "one 109-Mvar thyristor-controlled reactor bank (TCR) and three 94-Mvar thyristor-switc...

18 dagen ago | 0

| accepted

Answered
Does anyone know how to use an IF statement with ODE's? I am trying to create an IF statement sigma > 0 , tau > 0 if dx(3,1) > 0, dx(1,1) > 0 and sigma = 0 , tau = 0 otherwise
@Christopher, [edit: fix spelling error; no changes to code] [Edit: Change "./" to "/" inside function odefcn(), since "./" is...

27 dagen ago | 0

Answered
Inferring real-world coordinates from pixel positions
@Francesco, The projection equation from world (x,y,z) to image (u,v) is We can estimate A from the control points: % Contr...

29 dagen ago | 1

| accepted

Answered
3D plot: draw xy grid line on the middle of the plot box
@Lloyd Bumm, Try grid3() on the File Exchange., by @Hristo Zhivomirov. x=-2:0.2:2; y=-2:0.2:2; [X,Y]=meshgrid(x,y); Z=-2+4*e...

29 dagen ago | 0

Answered
What is the purpose of the input argument 'Tolerance' in the risetime function?
@Samuel Foster, Here's an example of tolerance making a difference: t=0:999; x=(mod(t/100,2)>=1 & mod(t/100,6)<5)+0.8*(mod(t/...

30 dagen ago | 0

| accepted

Answered
Bivariate colorscale for color plot
Another approach is to map f in one color and map g in another color, then combine them. x=-10:0.5:10; y=-10:0.5:10; [X,Y]=mes...

ongeveer een maand ago | 0

Answered
H1 H2 Hv estimators all the same
@Riccardo, [Edit one sentence fo rclarity. No changes to code.] When you get coherence=1, it is an indicator that you have not...

ongeveer een maand ago | 0

| accepted

Question

3d plot with +Y up and +Z left
When I plot a side view of a 3D object, with +Y axis up and +Z pointing left, the axis labels are in the wrong place or absent. ...

ongeveer een maand ago | 0 answers | 0

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answers

Answered
Seeking Alternative Optimization Methods for a 9-Parameter Optimization Task
@payam samadi, [Edit: Some of the equations in my answer do not look right. I pasted them in. The equations looked fine in th...

ongeveer 2 maanden ago | 0

| accepted

Answered
Extracting Vessel Dimensions from 2D Fluorescence Microscopy Images in MATLAB
@Alessio, Consider Better Skeletonization in the File Exchange. Please upload a frame of the raw .h5 video image. You write ...

ongeveer 2 maanden ago | 0

Answered
How to extract 3D position from the 2D projection using (an optimzation method + 3D Gaussian PDF)
@payam samadi, Good job by you to make a solid effort before asking for help on your homework. You are a good example. The p...

2 maanden ago | 0

Answered
Plot legend contours messed up
@dormant, Try the attached. Good luck. Edit: Update the script, as descirbed in my comment below.

2 maanden ago | 1

Answered
Max velocity on 1/3 octave band from Acceleration-Time data
@Gerald, I have been doing the same tyhing as @Mathieu NOE b ut not as quicjkly. One thing I noticed is that the line V_fft =...

2 maanden ago | 1

Answered
Solve equilibrium equations in MATLAB for a quadruped robot
@idan, The same problem arises in a simple example: compute the weight on each wheel of an automobile. If you assume the car, i...

2 maanden ago | 0

Answered
modulate delivers asynchronous result
@fabian hohmann, The result you observe is because the sampling rate (fsw in your code) is too low to support the extremes of m...

3 maanden ago | 0

| accepted

Answered
How to get Pressure Sensor Resistance Values
@Brian, You have not shared any code, so I am just guessing... Maybe you are using for loop to get the resistances and plot t...

3 maanden ago | 0

Answered
Trying to use audiorecorder for impulse response testing in a for loop
@Aditya, I do not have an Arduino, and the only audio devices are the built-in speakers and microphone on my PC. (I know they w...

4 maanden ago | 0

Answered
Handling Numerical Instability in Estimating Angle Between 2D Points
@Leo, [moved my comment to be an answer, which is what I intended] You are defining numerical instability as a discontinuity....

4 maanden ago | 1

Answered
Fit a standard exponential fit to approximate data
@Reji G, [Fix spelling error: fit1(x,y,'exp1') should be fit(x,y,'exp1'...).] Thank you for providing Data.xlsx. data=importd...

4 maanden ago | 0

Answered
How do you indicate a line between a user and a GPS satellite?
@인혁 Why do you think there are errors? I modified your script slightly to display the receiver radius from Earth center, and t...

4 maanden ago | 0

| accepted