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ChrisR


Last seen: Today
2 987 total contributions since 2015

I teach courses in water resources and environmental fluid mechanics.

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ChrisR's Badges

  • Divisible by x Master
  • Tiles Challenge Master
  • Matrix Patterns III Master
  • Strings I Master
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  • Cody Problems in Japanese Master
  • Promoter
  • Magic Numbers II Master
  • Sequences And Series I Master
  • ASEE Challenge Master
  • Matrix Patterns II Master
  • Number Manipulation II Master
  • Indexing II Master
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Solved


Simple Income Tax

ungefär 4 timmar ago

Problem


Find integer solutions to an equation with a sum of binomial coefficients

ungefär 14 timmar ago | 0 | 0 solvers

Solved


Number Puzzles - 012

ungefär 20 timmar ago

Solved


Number Puzzles - 011

ungefär 20 timmar ago

Solved


Get ranks of values in a vector
For a given vector, say [6 3 8 2], return the ranks (ascending) of observations, i.e. [3 2 4 1]. Do not worry about tied ranks. ...

en dag ago

Problem


List prime anagrams of a number

en dag ago | 1 | 2 solvers

Solved


FizzBuzz
<http://c2.com/cgi/wiki?FizzBuzzTest FizzBuzz Test> The "Fizz-Buzz test" is an interview question designed to help filter out...

en dag ago

Solved


McCabe Complexity
The Challenge is to return the McCabe complexity for various functions. One way to determine the McCabe Complexity is to use ...

en dag ago

Problem


Pass the cards in Fitch Cheney's five-card trick

en dag ago | 0 | 1 solver

Solved


Which coins to give
I was in shop today. I admired, how shop assistant had to think, which coins to give me. The task is we have a vector v=[0.5 0....

3 dagar ago

Problem


Compute an improper integral of a ratio of algebraic functions

3 dagar ago | 0 | 4 solvers

Solved


The glass half full
Identical glasses are placed in a triangular tower structure, such that the top level (L = 1) comprises one glass, the next leve...

3 dagar ago

Solved


short or buy ? take the opportunity
you had already calculated a theoretical stock value, now you checked in bloomberg the quoted price of that stock and you have t...

3 dagar ago

Solved


continuous compounding
what's the present value of having 100 dollars after n years given a continuously compounded rate i ? keep only 2 decimals pleas...

3 dagar ago

Solved


currency converter
given a rate of exchange calculate the equivalent units of 100 USD

3 dagar 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...

3 dagar ago

Solved


Jack's hand in "Titanic" ♤
Given a series of cards, return true if it's the famous hand. Note that i pretend that poker cards goes from 1 to 10 so be care...

3 dagar ago

Solved


basic finance application
i watch bloomberg everyday and i want to estimate a stock price stability, so i have to calculate the momentum & the rate of cha...

3 dagar ago

Solved


Portfolio diversification: choose your stocks !
we have the returns of 3 stocks for the last 4 years and we have to combine only 2 stocks that are less correlated. Example: ...

3 dagar ago

Solved


Check for keywords
If the entered string is a MATLAB keyword, return true else false

4 dagar ago

Solved


Dial Up
Each number on telephone keypads, except 0 and 1, corresponds to a set of uppercase letters as shown in this list: 2 ABC, 3 DEF...

4 dagar ago

Solved


rearrange the input from more to less?

4 dagar ago

Solved


Reepeating numbers in array
Repeating numbers in array In = [1 0 0 0 2 0 0 0 3 0 0 0 0 0 5 0 0 0 0]. Out = [1 1 1 1 2 2 2 2 3 3 3 3 3 3 5 5 5 5 5].

4 dagar ago

Solved


Bleed non-zeros to the right
What a title! Yet, it says what I mean. You get a vector, some values and a lot of zeroes. Every zero is replaced by the firs...

4 dagar ago

Solved


Create a random vector of integers with given sum
Your task today is to write a function that returns a vector of integer numbers, between, and including, 1 and m, of which the s...

4 dagar ago

Solved


Elastic Collision 001: 1-D
Elastic Collision of two particles. <http://en.wikipedia.org/wiki/Elastic_collision wiki Elastic Collision> Solve Conservat...

5 dagar ago

Solved


Reverse Concatenation
Suggest methods to form a Matrix after deleting one of the input's elements. Input should be element's position and output shou...

5 dagar ago

Problem


Guess the card in Fitch Cheney’s five-card trick

5 dagar ago | 0 | 1 solver

Solved


Wind outward from the center ...
Create an n-by-n matrix with elements ranging from 1 to n^2 in a rectangular spiral pattern. Example if n = 5 : 21 ...

6 dagar 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...

6 dagar ago

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