Community Profile # William Rose

Active since 2007

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How apply the conformal mapping? (circle to rectangular)
@Changwoo Lee, Is this a homework problem? The figure has an inconsistency. The left hand side shows a light blue region whos...

4 hours ago | 0

I'm having trouble plotting the temperature field for a thin plate with border temperatures known.
@Lucas Resende, theta1 has dimensions 5x5. You define it with a loop over n=1:100. SInce there is no index in the assignment ...

5 hours ago | 0

[HELP] Statistics in MATLAB - Two way Mixed anova or something else ?
@John Doe, Please consider my second comment below my answer. I meant to post it as an answer.

6 hours ago | 0

Spectrogram Audio Movement Detection
@LabRat, You asked: "Is there an easy way to automatically detect..." No. There is not an easy way. As you know, a spectrogr...

1 day ago | 1

how to convert the seismic wave data in Excel to Fourier spectrum using filtering and sampling
@Changhyun Kim, In the script you posted, the first plot you generated was over-written by the second plot you generated. Addi...

3 days ago | 0

how to convert the seismic wave data in Excel to Fourier spectrum using filtering and sampling
@Changhyun Kim., [edit: I adjusted the frequency-domain filtering to make the filtered X symmetric about the Nyquist frequency....

3 days ago | 0

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Create ring mesh with specified size
@Lawson Bailey, Here is a ring-shaped mesh. Just for the heck of it, I have assigned a z-height as follows: where hw=(ro-ri)...

3 days ago | 0

how to convert the seismic wave data in Excel to fourier spectra
@Changhyun Kim data=xlsread('GYEONGJU(MKL).xlsx'); N=length(data); t=data(:,1); %vector of times (s) x=data(:,2);...

3 days ago | 0

How can I locate and extract the data of a specific parameter (i.e. blood velocity, TAMEAN) from a DICOM file?
@Myrthe Stalmans, I might be able to help. I have recorded Doppler ultrasound blood flow data from femoral, carotid, radial, b...

6 days ago | 0

please, I want someone to help me with MATLAB code for solving the non linear constrained equation as given below
@Ezra Dzarma, [edit: added lines to display -f(x) and constraint 1 at the solution point.] Please carefully read the help for...

6 days ago | 0

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How to plot 3D plot from polar plot
[moved this from Comment to Answer as I had originally intended] @David Harra, Please post the simplest possible code fragmen...

6 days ago | 0

Why does smoothdata give bad results at the beginning and end of a dataset?
@Rick Yuan, [edit: change "on one side" part of my description to "inside" and "outside", which is more clear, I hope] You are...

6 days ago | 2

1D Heat Conduction using Eulers Explicit discretisation
@Yashraj Randad, Note that length(x)=21, but your n=20. This causes problems. I recommend that you initialize a bit different...

6 days ago | 0

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Which image processing or filtering is used in this image?
@burcu bilgic, it looks like the image on the right is the complement of the image on the left. J=imcomplement(I) From the hel...

6 days ago | 0

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Align smartphone and vehicle using Acceleration and Orientation from Matlab Mobile
@David Stefan, Try the following for the rotation matrix R=: where [0.375561 -0.385512 0.023676]. The matrix Rxyz is de...

7 days ago | 0

Data treatment: How to use exponential regression types of functions to approximate to a specific model (tobler's hiking function)
@Rúben Ricardo, You have deltaLat(i,:)=(B(i+1,1)-B(i,1))*60*1852; % diferença das latitudes deltaLon(i,:)=(B(i+1,2)-B(i,2))*6...

7 days ago | 1

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Align smartphone and vehicle using Acceleration and Orientation from Matlab Mobile
@David Stefan, The information provided is not sufficient to determine the rotation matrix. Also, the data you gave is not con...

7 days ago | 0

Plotting Wing Surface Through a Grid Point
@Fabio Taccaliti, [edit - fix typo in comment - misspelled Joukowsky] Here is a simple and elegant way to generate a wing prof...

7 days ago | 0

Plotting Wing Surface Through a Grid Point
@Fabio Taccaliti, I do not understand what is wrong with the final image generated by your code. It looks good to me. The on...

8 days ago | 0

How to calculate angle between two vectors?
@Ors, My comment above was intended to be an answer. Please accept this answer if it is satisfactory. Here is some code. F=[-2...

8 days ago | 1

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How do I plot the FFT of signal from accelerometer
@Harrison Osasogie Edokpolor, Try the code below. It makes the figure below. The figure shows that the oscullaiton frequency...

8 days ago | 0

How do I plot the FFT of signal from accelerometer
@Harrison Osasogie Edokpolor, Sampling rate is fs=833 Hz and there are N=1110 samples. (I deleted line 1 since it has only one...

8 days ago | 0

least square method with multible unkonwn
@Rolfe, I will look at this later this week, if you do not have an answer by then. Below is a part of an analysis I did related...

13 days ago | 0

Integration of the expected value
@Yuriy, I'm not sure I understand. Is a uniformly distributed random variable, or is the expected value of p, which is a unif...

13 days ago | 0

Periodic input to ODE solver
@Eric Scott, Create a smooth pulsatile input signal with a specified non-zero duration. Add it to your ODE. For example, consi...

13 days ago | 0

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@Aristo, Yes it is possible. Three points define a quadratic equation. The quadratic equation that passes through (x1,y1), (x...

20 days ago | 0

Find out whether a 2D line (y = a*x + b) intersects with a square without using "solve" (I need something faster)
@Perico Nasdemico, If the slope, a, is positive, then, if there is an intersection, the line passes below or through the upper ...

20 days ago | 1

How can I plot x and y RGB values of an image to analyze?
@omar soufan, Try the following: im1=imread('knifetest1.jpg'); zr=im1(:,:,1); %get the red intensity array zg=im1(:...

20 days ago | 0

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