# Mark Posen

### RPC Telecommunications Ltd.

I am a satellite communication engineer, specialising in spectrum and regulatory engineering, interference analysis and frequency coordination.

I have been programming since the mid-1970s (I used to be able to code by hand-punching Hollerith Cards!) but for the past 20-years or so I have really not done much coding at all. I'm trying to remedy that by learning MATLAB!

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**Content Feed**

Solved

Number of Even Elements in Fibonacci Sequence

Find how many even Fibonacci numbers are available in the first d numbers. Consider the following first 14 numbers 1 1 2...

13 hours ago

Solved

Is X a Fibonacci Matrix?

In honor of Cleve's new blog and post: <http://blogs.mathworks.com/cleve/2012/06/03/fibonacci-matrices/> Is X a Fibonacci ...

16 hours ago

Solved

I've got the power! (Inspired by Project Euler problem 29)

Consider all integer combinations of a^b and b^a for the integer values 2 ≤ a ≤ 4 and 2 ≤ b ≤ 5: 2^2=4, 2^3=8, 2^4=16,...

1 day ago

Solved

Let's see how peculiar we can get

The task is to multiply two numbers. But do it in the most peculiar possible way.

2 days ago

Problem

Backgammon #5 - Valid Move?

A previous problem in this occasional series (Problem 45967) set up a possible representation of a backgammon board: White ston...

3 days ago | 1 | 1 solver

Solved

Four digit number ABCD reversal

write a MATLAB function to find the four-digit number ABCD when multiplied by 4 returns DCBA. The function takes an input x=4.

3 days ago

Solved

Similar Triangles - find the height of the tree

Given the height, h1, of a power pole, shorter than a tree, a given distance, x2 away, please find h2, height of the tree. Pleas...

3 days ago

Solved

root?

* Given a function 'foo', and a position 'there', find the root near 'there'. * For example: If foo=@sin, and there=3.1, then r...

4 days ago

Solved

How to subtract?

*± ± ± ± ± ± ± ± ± ± ±* * Imagine you need to subtract one...

5 days ago

Solved

Sunday bonus

Submit a solution on any Sunday and you will get 10 points. Only for MATLAB fans!

5 days ago

Solved

replace empty matrices with '[]'

for example a=1;a(:,1)=[]; returns a = Empty matrix: 1-by-0 use this as the input,and the output should be '[]...

7 days ago

Problem

Backgammon #4 - Dice Probabilities

Previous problems in this series have looked at how a backgammon board might be represented, and board positions manipulated and...

8 days ago | 1 | 3 solvers

Solved

Scoring for oriented dominoes

Given a list of ordered pairs, and the order they should be placed in a line, find the sum of the absolute values of the differe...

9 days ago

Solved

Calculate the answer to life the universe and everything

<https://en.wikipedia.org/wiki/42_(number)>

9 days ago

Solved

Add the positive numbers

Add only the positive numbers of x example: x = [-2 -1 0 1 2 3] the positive numbers are: 1 2 3, so their sum is 6

9 days ago

Solved

Sum of digits of powers of 2

Given n, first, calculate the number 2^n. Then, sum the digits that comprise that number. For example: Input: n = 7 2^n = ...

9 days ago

Solved

Numeric array to cell array of strings (easy)

Given a numeric array (A) and a 1xk cell array of strings (C), return a cell array (B) that is the same size as A and in which e...

10 days ago

Problem

Backgammon - Display a Board Position

A previous problem in this occasional series (Problem 45967) set up a possible representation of a backgammon board: White ston...

10 days ago | 1 | 1 solver

Solved

Solve expression III

Solve expression for given vector x. Expression = (tan(2*x^2+7*x-30.25)+log(x^3-2.25))/(nthroot(sin(x^3)^2+1/5*log(x^4-2.5),3))...

10 days ago

Solved

Wrapping the Tower of Pisa

The famous artist Christo Vladimirov Javacheff, who likes pizza, wants to wrap the well-known Italian tower in paper. It is a ci...

10 days ago

Solved

Help the Patriots get to the Super Bowl

Given a football by the Patriots, return it to them with 2 psi less air in it. (The original psi is passed as a number to the...

10 days ago

Solved

determine amount cookies left

started with 3 cookies and you never ate any how many are left

10 days ago

Solved

what's my tax amount this year ?

given an annual salary x and a tax rate i calculate the amount that you have to pay.Example x = 70000; i=.10 y_correc...

10 days ago