Youssef Khmou

Con actividad desde 2012

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Distance formula using while loop
In the given formulae, are the variables vectors? if it is the case, then you need to use index in the loop for each variable to...

casi 7 años hace | 0

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reading frequency from fft
The first part of the program is correct, the result is 100 Hz: Fs = 65536; % Sampling Frequency (Hz) Ts = 1/Fs; % Sampli...

casi 7 años hace | 0

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Generating wavepackets in MATLAB
Among the methods for generating wavepackets is linear superposition, considering the spatial dimension x, an elementary complex...

casi 7 años hace | 1

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Randomly select samples from a matrix in proper order
The selection procedure can be performed by ordering the inputs from the smallest to the largets, here is an example, a vector o...

casi 7 años hace | 0

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create a new matrix with elements from different sized matrices
By computing the difference between the two matrices A and B, find the indexes of the entries that equal zero and replace the en...

casi 7 años hace | 0

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Need help on designing plot
defining the variable is the first step : x=0:pi/100:20*pi; using element wise operation : y=x.*sin(x); z=x.*cos(...

más de 9 años hace | 0

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How can i compute inverse of 3-dimensional matrix?
There is misunderstanding between the question and the provided example, according the question, Jhon's answer is correct, three...

más de 9 años hace | 0

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How Fourier Synthesis is performed using Matlab ?
Fourier synthesis is simple application of coefficients summation either numerically or symbolically, Fourier decomposition requ...

más de 9 años hace | 3

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Write a function that takes a vector xyz and returns as output two variables
try : function [Mav,Err]=myAver(u) % hint : use sum, length, std,...

más de 9 años hace | 0

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Variable Sampling Frequency Interpolation-hrv
An alternative solution exists using resample(x,p,q) function where the new signal is sampled with p/q times the original sampli...

más de 9 años hace | 0

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Filtering a set of recorded data
The important part of the problem is the implementation of MA filter, here is an example of 6 points window, fs=80; t=0:1...

más de 9 años hace | 0

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Trouble with Envelope Functions
try the following basic solution using Hilbert transform : fs=40; t=0:1/fs:4-1/fs; f=15; y=1.5*sin(2*pi*f*t).*exp(-1.1*...

más de 9 años hace | 1

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how can i plot spherical coordinate?
plotting in the same yields to polar coordinates, try polar(theta,rho); if it is different than the above case, explain ...

más de 9 años hace | 0

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Matlab - FFT/PSD Problem for Preemphasis
I think the first question is not well interpreted, maybe it consists of generating noisy version of y instead of white noise, i...

más de 9 años hace | 0

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Matlab - FFT/PSD Problem for Preemphasis
When using the reverse fft function, we take the real part, in one of the equations H.*G is not necessary since G=H.^-1, another...

más de 9 años hace | 0

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how to compare histograms
Many approaches exist for this purpose, the easiest way is the root mean square error metric, the minimum value means best match...

más de 9 años hace | 0

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Filter of sin component of sound signal
Concerning the equation of y, can you explain its origin. As for the error, initial condition must be set : y=zeros(size(x))...

más de 9 años hace | 0

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Hi all. I need to plot a Fast Fourier Transform(FFT) of a sinc function
Let us consider non causal function, we can use built in function as follows : Fs=42;Ts=1/Fs; t=-1:Ts:40*Ts-Ts; f=5; y...

más de 9 años hace | 1

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How to derivate a vector
additionally to the above answers, the simplest way to evaluate the polynomial is via anonymous function : f=@(x) x.^2+x-1...

más de 9 años hace | 0

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Preventing all [x,y] figures appearing when running a plot of a circle
Adding semi column (;) for all instructions inside the function will prevent the printing of values.

más de 9 años hace | 0

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How can i set (f) = (-60/(s^2+5s+48.5))?
Element wise operation fixes the error : f=-60./(s.^2+5*s+48.5);

más de 9 años hace | 0

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Trying to make a function for summing up 3 numbers. Explaination below
This function works for a vector of length n, with second logical output according to the description : function [Logical...

más de 9 años hace | 0

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How to I get a threshold value from looking at histogram
Otsu's method exists as built in function with name *graythresh*, here is an example taken from Mathworks help page : I = i...

más de 9 años hace | 1

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Matlab analytical FT and FFT comparison
numerical fft requires a shift if we want to visualize the spectrum with both negative and positive frequencies, scaling problem...

más de 9 años hace | 0

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Trying to make a function for summing up 3 numbers. Explaination below
the following answer is an alternative approach without using 'getdigits' function : function [C,y]=sum3(x) h=int2st...

más de 9 años hace | 0

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Driven Damped Pendulum Axes Question
The implementation is acceptable, the first remark is that visualization commands of results should be outside the loop, otherwi...

casi 10 años hace | 0

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Is 'newplot' the reason why 'image' and 'plot' are no longer working on my computer?
In previous version of software it works correctly, if you have used the name 'image' for your constructed function, rename it. ...

casi 10 años hace | 0

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Adding white gaussian Noise to 1D signals
To produce a unique sequence of white Gaussian noise, you need to reset the sate as follows : x=sin(2*pi*0.2*(0:0.1:10));...

casi 10 años hace | 0

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How to simulate a spherical pendulum in matlab?
You can look for solution in this link : <http://scicomp.stackexchange.com/questions/8595/numerical-instability-of-spherical-...

casi 10 años hace | 1

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How do I randomly select a zero in a matrix and replace it with a value from another matrix?
The description is not complete, because localization of position in zero matrix requires two indexes x and y try : B=zero...

casi 10 años hace | 0

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