# Are Mjaavatten

Retired physicist with background in the petroleum and process industry. My main interests are mathematical modelling, numerical methods, and thermodynamics.

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**Content Feed**

Solved

Find the nth consonant number.

Everyone heard about the nth prime number. Let's try to find out the nth consonant. For example , 1 is the first consonant, 10 i...

ongeveer 20 uur ago

Solved

Guess the number I'm thinking of (Part 2)

Have you tried the original "Guess the number I'm thinking of" (Problem 44630)? This problem is just like that, except that the...

ongeveer 20 uur ago

Solved

Guess the number I'm thinking of (Part 1)

In this game you are competing against two other people to guess the number that I'm thinking of. I randomly choose an integer ...

ongeveer 20 uur ago

Solved

Cancel Middle

Write a function called cancel_middle that takes A, an n-by-m matrix, as an input where both n and m are odd numbers an...

3 dagen ago

Solved

Sort Except Zeros

Sort the numbers in a vector. But the position of zeros should not be changed. Example: sort_except_zeros( [5 3 0 0 2 4] ) == [...

4 dagen ago

Solved

Double Fibonacci

double_fibonacci takes two integers, each greater than one, as input arguments (it does not have to check the format of the inpu...

4 dagen ago

Solved

Numbers spiral diagonals (Part 2)

Inspired by Project Euler n°28 and 58. A n x n spiral matrix is obtained by starting with the number 1 and moving to the right ...

5 dagen ago

Solved

Numbers spiral diagonals (Part 1)

Inspired by Project Euler n°28 et 58. A n x n spiral matrix is obtained by starting with the number 1 and moving to the right...

5 dagen ago

Solved

Recurring Cycle Length (Inspired by Project Euler Problem 26)

Preface: This problem is inspired by <http://projecteuler.net/problem=26 Project Euler Problem 26> and uses text from that quest...

5 dagen ago

Solved

Project Euler: Problem 18, Maximum path sum I

By starting at the top of the triangle below and moving to adjacent numbers on the row below, the maximum total from top to bott...

6 dagen ago

Solved

Project Euler: Problem 16, Sums of Digits of Powers of Two

2^15 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26. What is the sum of the digits of the number 2^N? Thanks ...

7 dagen ago

Solved

Longest Collatz Sequence

Inspired by Projet Euler n°14. The Collatz iterative sequence (See Cody problem n° 2103 and 211) is defined for the set of po...

8 dagen ago

Solved

Large Sum (inspired by Project Euler 13)

Your function will be provided an arbitrary number of numbers of arbitrary sizes as a cell array of strings. Some numbers will b...

10 dagen ago

Solved

Divisors for big integer

Inspired by Problem 1025 and Project Euler 12. Given n, return the number y of integers that divide N. For example, with ...

10 dagen ago

Solved

Highly divisible triangular number (inspired by Project Euler 12)

Triangular numbers can be calculated by the sum from 1 to n. For example, the first 10 triangular numbers are: 1, 3, 6, 10, ...

10 dagen ago

Solved

Project Euler: Problem 11, Largest product in a grid

What is the greatest product of _k_ adjacent numbers in the same direction (up, down, left, right, or diagonally) in a _n×n_ gri...

11 dagen ago

Solved

Duplicates

Write a function that accepts a cell array of strings and returns another cell array of strings *with only the duplicates* retai...

11 dagen ago

Solved

Sum of big primes without primes

Inspired by Project Euler n°10 (I am quite obviously a fan). With problem n°250 by Doug, you can find some global methods to ...

13 dagen ago

Solved

Sums of cubes and squares of sums

Given the positive integers 1:n, can you: 1. Compute twice the sum of the cubes of those numbers. 2. Subtract the square...

13 dagen ago

Submitted

Curvature of a 1D curve in a 2D or 3D space

Calculates the local radius of curvature as well as the cumulative arc length and the curvature vector along a 1D curve in 2D or...

13 dagen ago | 78 downloads |

Solved

Genome Sequence 003R: Sequence DNA of random positioned and flipped segments

This is Challenge 003R in the series on Genome DNA Sequencing. Challenge 3R includes flipped segments. DNA Sequencing is naively...

14 dagen ago

Solved

Genome Sequence 003: DNA Sequence with random positioned segments

This Challenge series will evolve the complexity of Genome DNA Sequencing. DNA Sequencing and the Shot Gun Method will be naivel...

14 dagen ago

Solved

Genome Sequence 002: Introductory DNA Sequencing (Flipped Segments)

This Challenge series will evolve the complexity of Genome DNA Sequencing. <http://en.wikipedia.org/wiki/Genome DNA Sequencing> ...

17 dagen ago

Solved

Genome Sequence 001: Introductory DNA Sequencing

This Challenge series will evolve the complexity of Genome DNA Sequencing. <http://en.wikipedia.org/wiki/Genome DNA Sequencing> ...

17 dagen ago

Error in setdiff function

One workaround is to replace all NaNs with some spceific value that is not present in your data, say -9999: >> S1 = [1,2,3,NaN,...

25 dagen ago | 0

How can I solve an ode where one of the variables is a matrix?

A(t) should be a function, not a vector. Below I define A as an anonymous function. I also use an anonymous function for your ...

25 dagen ago | 0

| accepted

4D data /Index exceed array bounds

I think it may be better to let M_Val be a cell array of 5 ordinary arrays, where M_Val{k} is of dimension 134 by 2 by nsyll(k)....

26 dagen ago | 0

Solved

Pi Estimate 1

Estimate Pi as described in the following link: <http://www.people.virginia.edu/~teh1m/cody/Pi_estimation1.pdf>

27 dagen ago

4D data /Index exceed array bounds

I think you may have inadvertently created a cell array containing your whole data matrix in element 1. Something like this: >...

27 dagen ago | 0

Solved

Return a list sorted by number of occurrences

Given a vector x, return a vector y of the unique values in x sorted by the number of occurrences in x. Ties are resolved by a ...

28 dagen ago