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# GEORGIOS BEKAS

428 total contributions since 2017

Engineering Optimization specialist

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Question

Reshaping an 1x365 matrix with daily observations within a year
I have a matrix with observations and its size is 1x365. It has to do with daily observations starting from the day Sunday, whic...

7 mois ago | 1 answer | 0

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Divisible by 9
Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

9 mois ago

Solved

Divisible by 3
Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

9 mois ago

Question

Can you find the error in this code that aims to sum the digits of a string?
I wrote this code in order to sum the digits of any string, and to also create a loop that stops the summing process when the le...

9 mois ago | 2 answers | 0

### 2

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Determine the length of a string of characters
Determine the length of a string of characters

9 mois ago

Solved

Accessing elements on the diagonal
Access the diagonal elements of a matrix without 'diag' function

9 mois ago

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Sum the 'edge' values of a matrix
Sum the 'edge' values of an input matrix (the values along the perimeter). Example [1 2 3 4 5 6 7 8 9] Output = ...

9 mois ago

Solved

MATCH THE STRINGS (2 CHAR) very easy
Match the given string based on first two characters on each string. For example A='harsa'; b='harish'; result '1' ...

9 mois ago

Solved

Kaprekar Steps
6174 is the <http://en.wikipedia.org/wiki/6174_%28number%29 Kaprekar constant>. All natural numbers less than 10,000 (except som...

9 mois ago

Solved

Duplicates
Write a function that accepts a cell array of strings and returns another cell array of strings *with only the duplicates* retai...

9 mois ago

Question

Reading a dat file; there is a bug
I have written the following code in order for MATLAB to read a dat file that I attach. There is a bug in line 20, despite the ...

9 mois ago | 1 answer | 0

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Question

Logic behind triple loops
Hi I am new in triple loops and trying to find a way to automate the generation of these numbers: 11000 11001 21001 ...

environ un an ago | 0 answers | 0

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Question

BAYESIAN OPTIMIZATION OF A NEURAL NETWORK
I wrote the following code to optimize the architecture of a neural network via Bayesian optimization. What's wrong with it? ...

environ un an ago | 0 answers | 0

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Question

Error in creating a function
What's wrong in the following expression? ObjectiveFunction = @x() sim(net, x')

environ un an ago | 1 answer | 0

### 1

Question

USING A NEURAL NETWORK AS AN OBJECTIVE FUNCTION INSIDE A GENETIC ALGORITHM
I trained a neural network with the name 'net', after that I am using a genetic algorithm to do some optimization. After using ...

environ un an ago | 0 answers | 0

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Area of a circle
Find the value for area of the circle if diameter is given

environ un an ago

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find the surface area of a cube
given cube side length x, find the surface area of the cube, set it equal to y

environ un an ago

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Matlab Basics - Create a row vector
Write a Matlab script to create a row vector of 10 consecutive numbers x = [1 2 3 4 5 6 7 8 9 10]

environ un an ago

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Create a square matrix of multiples
Given an input, N, output a matrix N x N with each row containing multiples of the first element of each row. This also applies...

environ un an ago

Solved

CONVERT TAN TO SIN
In a right angle triangle ABC given the tan(A) then find sin(A) For example tan(A)=3/4 then sin(A)=3/5

plus d'un an ago

Solved

Hard limit function
Classify x data as if x>=0 then y=1 if x<0 then y=0 Example x = [ -2 -1 0 1 2] y = [ 0 0 1 1 1]

plus d'un an ago

Solved

Replace multiples of 5 with NaN
It is required to replace all values in a vector that are multiples of 5 with NaN. Example: input: x = [1 2 5 12 10 7] ...

plus d'un an ago

Solved

Zero Cross
Write a function that counts the number of times n a signal x changes sign. Examples x = [1 2 -3 -4 5 6 -7 8 -9 10 11] ...

plus d'un an ago

Solved

Output any real number that is neither positive nor negative
Output any real number that is neither positive nor negative

plus d'un an ago

Solved

Find the body mass index. For reference, please refer to Wikipedia here: <http://en.wikipedia.org/wiki/Body_mass_index body ...

plus d'un an ago

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07 - Common functions and indexing 2
Define _eMat_: <<http://samle.dk/STTBDP/Assignment1_3e.png>> Calculate eMean as the mean across the rows of _eMat_. The an...

plus d'un an ago

Solved

Back to basics 11 - Max Integer
Covering some basic topics I haven't seen elsewhere on Cody. Return the largest positive integer MATLAB can handle.

plus d'un an ago

Solved

06 - Matrix Equations 1
Define the vectors _aVec_ and _bVec_ and the matrix _aMat_: <<http://samle.dk/STTBDP/Assignment1_2a.png>> and <<http:/...

plus d'un an ago

Solved

given 3 sides, find area of this triangle
1:3 -> 0; 3:5 -> 6

plus d'un an ago

Solved

Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
The given function returns the index of the maximum value in a given matrix. such as X=[4,3,4,5,9,12,0,5] Ans= 6 if maxim...

plus d'un an ago