Community Profile Mark Posen

RPC Telecommunications Ltd.

Last seen: Today Active since 2020

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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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

Expand a term
Given a term, as a string, expand it. e. g. f = '2(x + y)';

2 days ago

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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

Space Saver
Remove all characters that are below a space in ASCII value.

4 days ago

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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?
*&plusmn &plusmn &plusmn &plusmn &plusmn &plusmn &plusmn &plusmn &plusmn &plusmn &plusmn* * 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

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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

Solved

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

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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

Summation of integers

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

free points
function y = your_fcn_name(x) y = x(1)+x(2); end

10 days ago

Solved

Create vector as shown in test cases
Create vector as shown in test cases

10 days ago

Solved

Bruh
Return 'bruh'.

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