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Dimitris Kalogiros


National and Kapodistrian University of Athens

128 total contributions since 2018

This is my blog:
https://math2tech.blogspot.com

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Answered
Not getting single frequency signal...
Hi Hari You can use the following algorithm: clc; clearvars; close all; %% definition of frequencies fc=500; f_delta=100;...

13 days ago | 0

Answered
I need to solve an equation involving squares and cubes.
It is a 3rd order equation, it has only an analytical solution. You can use the following code: clc; clearvars; syms p ...

25 days ago | 0

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Answered
Count the number of intersections between any two curves
If you have two functions y=f(t) and y=g(t) you can find their intersections by solving the equation f(t)=g(t). But such a thin...

27 days ago | 0

Answered
How can I determine conditions and interpolate where necessary?
Stelio A good solution for you problem is to use polynomial interpolation. Have a look here: https://www.mathworks.com/matl...

1 month ago | 0

Answered
Inverse laplace - symbolic tool box
I had a look at your file. The definition of the laplace transform A contains a syntax error. It has an extra "=" without mea...

1 month ago | 0

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Answered
x^2 + y^2 =9
This equation depicts a circle with radious 3. clc; clearvars; syms x y eq= x^2+y^2==9 fimplicit(eq, [-3 3]); xlab...

1 month ago | 0

Answered
Area under the curve
Change the last section of your program to this: %% Sizing Capacitor Cf; %capacitor fundamental current for "a" phase is all t...

1 month ago | 0

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Answered
Plotting equation for certain values
Have a look on matlab help files about the following functions: tf : how to define a transfer function on s or z plane bodepl...

1 month ago | 0

Answered
how to use Subscript in for loop
What is Tr [ ] at your mathematica code ? Is it an array or a function (I am asking because I 've no experience on mathematica...

2 months ago | 0

Answered
How can i save two points with lambda in a vector ?
Run this: clear; clc; close all; %input points Points=[1 1; -1 1; -1 -1; 1 -1 ]; % make 'Points' to represent an close...

2 months ago | 0

Answered
how to find inverse
Generally, you must have in mind that : Taking that under consideration you can use the following piece of code clear; clc; ...

2 months ago | 0

Solved


the average value of the elements
Calculate the average value of the elements in the array

2 months ago

Answered
how to find H(e j(ω π) ) if you know H(e j(ω), you found out H(e j(ω) by using freqz
Keep in mind that, is a periodic function of , with period . Have a look at the following figure. Focus on the "blue" and the...

2 months ago | 0

Answered
Generate Random Number inside a closed area
Run your code many times and store the resulting point ( variable Point) into a file. Then every time you need a random point fr...

2 months ago | 0

Answered
Is there a way to choose what file to open in the command window using input(prompt)?
You can use uigetfile command: disp( "What is the file address to the first city?"); [firstcity,path] = uigetfile('*.txt'); ...

2 months ago | 1

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Answered
how to represent approximate equal symbol
A suggestion : while a > 4090 && a <5010 % your code end In fact "approximately" is something relative and depen...

2 months ago | 0

Answered
Undefined Function or Variable
I think there is a typo at the formula that calculates R : Something is missing there. Maybe a + or * mark By the way, ca...

2 months ago | 0

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Solved


Create a "+" flag
Given two odd numbers, [m, n], return a matrix of size m x n which has all elements of the centre column and centre row set as 1...

2 months ago

Answered
Compute probability of different states in a binary distribution
clc; clearvars % input data N=300; % always even x=randi([0, 1], N, 1); % two bits words % 00->0 , 01->1 , 10->2 , 11-...

2 months ago | 0

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Answered
Zeroing out particular frequency in audio signal
I'm giving you some tips: 1) Use high order FFT/IFFT . For example 8192 or even higher. 2) You have to filter out (by setting...

2 months ago | 0

Answered
Probability Density Function ??
First you have to import data from your excel file After that, you can calculate your PDF function, following this example: c...

2 months ago | 0

Answered
Filter with given group delay and frequency response
One choice is to use a block called Arbitrary Response Filter A second choice could be the usage of a simulink block called Dig...

2 months ago | 0

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Answered
problems with ifft of bandpass filtered white noise
Hi Anna. Pay attention to these lines of your code: n = 2^nextpow2(L); Y = fft(X,n); Because n>L, matlab adds some zeros at ...

2 months ago | 1

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Answered
Simple fixed-point iteration method
Dear John Put your function into the same folder with the program (m-file) that calls it.

3 months ago | 0

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Answered
How to compute the moving average of a signal with 6-hour window length and shifted 15 min at a time?
Hi Mohanad Bellow, you will find an example, where a moving average corresponding to a 6h window, is applied upon a signal take...

3 months ago | 0

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Answered
Transfer function from power delay profile (PDP)
You can use the following piece of code : % Sampling Rate Ts=1E-3; %Tsampling =1ms % Transfer function h=zeros(530+1); h(...

3 months ago | 0

Answered
Minus powers of a transfer function into Simulink
You can use "Discrete Filter" block , provided by simulink. You can find it here: DSP System Toolbox -> Filtering -> Filter ...

3 months ago | 0

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Answered
complex envelope in simulink
Sum of two sine signals is a real signal. So, its spectrum is symetrical around zero. A block diagram that produces a "complex ...

3 months ago | 0

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Answered
About Implementing a AGC
Dear Hari Here you are a simple version of a "feedback" structured AGC clearvars; clc; %% time instances dt=0.001 t=0:d...

3 months ago | 0

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Answered
How to delay signal input ?
Here is my suggestion:

3 months ago | 0

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