Community Profile # Youssef Khmou

Active since 2012

DISCLAIMER: Advices or Opinions posted are from author , and do not reflect that of MathWorks.

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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...

plus de 4 ans ago | 0

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...

plus de 4 ans ago | 0

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

plus de 4 ans ago | 1

| accepted

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...

plus de 4 ans ago | 0

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...

plus de 4 ans ago | 0

Submitted

J-V characteristic of solar cell
Current density and voltage Charateristic of solar cell using electron diffusion model

environ 7 ans ago | 6 downloads | 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(...

plus de 7 ans ago | 0

| accepted

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...

plus de 7 ans ago | 0

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

plus de 7 ans ago | 3

Submitted

3D Brownian Motion
Fast simulation of three dimensional Brownian motion

plus de 7 ans ago | 7 downloads | 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,...

plus de 7 ans ago | 0

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...

plus de 7 ans ago | 0

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...

plus de 7 ans ago | 0

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*...

plus de 7 ans ago | 1

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 ...

plus de 7 ans ago | 0

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...

plus de 7 ans ago | 0

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...

plus de 7 ans ago | 0

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...

plus de 7 ans ago | 0

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))...

plus de 7 ans ago | 0

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...

plus de 7 ans ago | 1

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...

plus de 7 ans ago | 0

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.

plus de 7 ans ago | 0

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);

plus de 7 ans ago | 0

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...

plus de 7 ans ago | 0

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...

plus de 7 ans ago | 1

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...

plus de 7 ans ago | 0

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...

plus de 7 ans ago | 0

| accepted

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

plus de 7 ans ago | 0

| accepted