# Daniel Pereira

Industrial Engineer, with more than 10 years experience in power plants modelling, and H2020 innovation projects.

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**Content Feed**

Solved

Fraction of a fraction of a ...

One sort of brainteaser problem is a math problem wherein you are asked what the given fraction of a fraction of a ... number is...

7 months ago

Solved

Approximation of Pi (vector inputs)

Pi (divided by 4) can be approximated by the following infinite series: pi/4 = 1 - 1/3 + 1/5 - 1/7 + ... For a given numbe...

7 months ago

Solved

Approximation of Pi

Pi (divided by 4) can be approximated by the following infinite series: pi/4 = 1 - 1/3 + 1/5 - 1/7 + ... For a given numbe...

7 months ago

Solved

Given a square and a circle, please decide whether the square covers more area.

You know the side of a square and the diameter of a circle, please decide whether the square covers more area.

7 months ago

Solved

Mersenne Primes vs. All Primes

A Mersenne prime (M) is a prime number of the form M = 2^p - 1, where p is another prime number. <https://www.mathworks.com/matl...

7 months ago

Solved

Pancakes for everyone!

Accordingly to the <http://nl.mathworks.com/matlabcentral/cody/problems/42460-the-cake-is-a-lie problem 42460>. All the children...

7 months ago

Solved

The cake is a lie...

You're hosting a birthday party with a large number of screaming children. Fortunately, you have a gigantic sheet cake in front...

7 months ago

Solved

Radiation Heat Transfer — View Factors (5)

View factors (aka configuration factors) are utilized in some radiation heat transfer models to estimate heat transfer rates bet...

7 months ago

Solved

Radiation Heat Transfer — View Factors (4)

View factors (aka configuration factors) are utilized in some radiation heat transfer models to estimate heat transfer rates bet...

7 months ago

Solved

Convex Hull Capture

Imagine four points in uv that form a square. uv = [ ... 0,0; 0,2; 2,2; 2,0]; Now we have two more po...

7 months ago

Solved

Find the sines of an isosceles triangle when given its area and height

Find the sines of an isosceles triangle when given its area and height. For example, when A=60 and h=5, the result is [0.3752...

7 months ago

Solved

solid of revolution

Given an real polynomial P and two real numbers a,b with 0<=a<=b. Calculate the volume of the solid of revolution made by rota...

7 months ago

Solved

Minimal cost

A power house, P, is on one bank of a straight river W meters wide, and a factory, F, is on the opposite bank L meters downstr...

7 months ago

Solved

Draw a 'Z'.

Given _n_ as input, generate a n-by-n matrix like 'Z' by _0_ and _1_ . Example: n=5 ans= [1 1 1 1 1 0 0 0 1 ...

7 months ago

Solved

Draw a 'X'!

Given n as input Draw a 'X' in a n-by-n matrix. example: n=3 y=[1 0 1 0 1 0 1 0 1] n=4 y=[1 0 0...

7 months ago

Solved

Draw 'O' !

Given n as input, generate a n-by-n matrix 'O' using 0 and 1 . example: n=4 ans= [1 1 1 1 1 0 0 1 ...

7 months ago

Solved

Draw a 'N'!

Given n as input, generate a n-by-n matrix 'N' using 0 and 1 . Example: n=5 ans= [1 0 0 0 1 1 1 0 0 1 1 0 ...

7 months ago

Solved

Draw 'J'

Given n as input, generate a n-by-n matrix 'J' using 0 and 1 . Example: n=5 ans= [0 0 0 0 1 0 0 0 0 1 0 0 ...

7 months ago

Solved

Draw 'I'

Given n as input, draw a n-by-n matrix 'I' using 0 and 1. example: n=3 ans= [0 1 0 0 1 0 0 1 0] n=...

7 months ago

Solved

Draw 'H'

Draw a x-by-x matrix 'H' using 1 and 0. (x is odd and bigger than 2) Example: x=5 ans= [1 0 0 0 1 1 0 0 0 1 ...

7 months ago

Solved

Draw 'F'

Draw a x-by-x matrix 'F' using 1 and 0. (x is odd and bigger than 4) Example: x=5 ans= [1 1 1 1 1 1 0 0 0 0 ...

7 months ago

Solved

Draw 'E'

Draw a x-by-x matrix 'E' using 1 and 0. (x is odd and bigger than 4) Example: x=5 ans= [1 1 1 1 1 1 0 0 0 0 ...

7 months ago

Solved

Draw 'D'.

Draw a x-by-x matrix 'D' using 0 and 1. example: x=4 ans= [1 1 1 0 1 0 0 1 1 0 0 1 1 1 1 0]

7 months ago

Solved

Draw 'C'.

Given x as input, generate a x-by-x matrix 'C' using 0 and 1. example: x=4 ans= [0 1 1 1 1 0 0 0 ...

7 months ago

Solved

Draw 'B'

Draw a x-by-x matrix 'B' using 1 and 0. (x is odd and bigger than 4) Example: x=5 ans= [1 1 1 1 0 1 0 0 0 1 ...

7 months ago

Solved

Function Sniffer

* Given a string, * find out which built-in functions are present, * output a simple string, * that has sorted and unique ...

7 months ago

Solved

Extract Built In Functions and Toolbox Functions from String or Function Handle

Find the Built-In functions and Toolbox functions in either a string or a function handle. Generate a string of alphabetized ...

7 months ago

Solved

The sliding puzzle: 3D

This is an extension of <https://www.mathworks.com/matlabcentral/cody/problems/42842 problem 42842>. In this case, the puzzle is...

7 months ago