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# Doddy Kastanya

Last seen: 22 days ago Active since 2017

I love math and physics. Being a nuclear engineer keeps this alive.

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Solved

Rotate counterclockwise a matrix 90 deg with left-bottom element
Example: Input [ 1 2 3 4 5 6 ] Output [ 3 6 2 5 1 4 ]

2 months ago

Solved

Easy Sequences 2: Trigonometric function with integral input and output
The function 'F', defined as: , will always return an integer if the input is a natural number (in radian...

2 months ago

Solved

letter yes yes & letter no no
Split a string into two strings, wherein the first string has all alphabetic letters and the second string has all the remaining...

9 months ago

Solved

the fly, the train, the second train, and their Zeno's paradox
*You have heard this one*: A train leaves station _A_ and travels with constant velocity _v1_. A second train leaves station _B_...

9 months ago

Solved

Calculate Engine Power
Calculate Engine Power (P) in kW given the values of Torque(M) in Nm and Engine Speed(n) in rpm

9 months ago

Solved

Electrical Diode Current Calculation
In engineering, there is not always a single equation that describes a phenomenon accurately enough to be applied in all instanc...

9 months ago

Solved

An Ohm's Law Calculator
*BACKGROUND / MOTIVATION:* Many important observations in math and science can be described by short, but powerful, equations...

9 months ago

Solved

Create an anti-identity matrix
Create an anti-identity matrix of given dimension. Examples n = 2 A = [0 1; 1 0] n = 3 A = [0 0 1; 0 1 0; 1 0 0...

9 months ago

Solved

determine the sum of the squares
if x = 4, the solution will be: y = 1^2+2^2+3^2+4^2=1+4+9+16 = 30.

9 months ago

Solved

sum all digits
input = 123456789, output = 1+2+3+4+5+6+7+8+9 = 45

9 months ago

Solved

Convert from Base 10 to base 5
Convert the input number from base 10 into base 5: for example: if a(in base 10)= 5 then a(in base 5)= 10

9 months ago

Solved

Tridiagonal matrix
Given vectors u and v, make a tri-diagonal symmetric matrix such that u is in the main diagonal and v is below and above diagona...

9 months ago

Solved

Number Puzzle - 119

9 months ago

Problem

Number Puzzle - 119

9 months ago | 0 | 9 solvers

Solved

Number Puzzle - 118

9 months ago

Problem

Number Puzzle - 118

9 months ago | 0 | 9 solvers

Solved

Draw a '4' in a zero matrix!

9 months ago

Solved

Draw a '6' in a zero matrix!

9 months ago

Solved

Draw a '9' in a zero matrix!

9 months ago

Solved

Draw a '7' in a zero matrix!

9 months ago

Solved

Draw a '8' in a zero matrix!

9 months ago

Solved

Draw a '5' in a zero matrix!

9 months ago

Solved

Draw a '3' in a zero matrix!

10 months ago

Solved

Draw a '1' in a zero matrix!

10 months ago

Solved

Sum of series VIII

10 months ago

Solved

Sum of series IX

10 months ago

Solved

Sum of series
a(n) = n^2 - (n-1)^2 find the summation of the series upto n i.e. a(1)+a(2)+...+a(n)

10 months ago

Solved

easy problem
Find the last element of the array

10 months ago

Solved

Find the max element of the array
Find the max element of the array

10 months ago