# David

### eSolar / Harvey Mudd College Alumnus

i like scientific computing, poetry, renewable technologies, theatrical improv, and growing beards.

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**Content Feed**

Solved

Remove all the consonants

Remove all the consonants in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill'; Output s2 is 'a ...

5 years ago

Solved

Pizza!

Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

5 years ago

Solved

Pangrams!

A pangram, or holoalphabetic sentence, is a sentence using every letter of the alphabet at least once. Example: Input s ...

8 years ago

Solved

Find the longest sequence of 1's in a binary sequence.

Given a string such as s = '011110010000000100010111' find the length of the longest string of consecutive 1's. In this examp...

8 years ago

Solved

Find the alphabetic word product

If the input string s is a word like 'hello', then the output word product p is a number based on the correspondence a=1, b=2, ....

8 years ago

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Nearest Numbers

Given a row vector of numbers, find the indices of the two nearest numbers. Examples: [index1 index2] = nearestNumbers([2 5 3...

8 years ago

Solved

Pascal's Triangle

Given an integer n >= 0, generate the length n+1 row vector representing the n-th row of <http://en.wikipedia.org/wiki/Pascals_t...

8 years ago

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Bullseye Matrix

Given n (always odd), return output a that has concentric rings of the numbers 1 through (n+1)/2 around the center point. Exampl...

8 years ago

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Binary numbers

Given a positive, scalar integer n, create a (2^n)-by-n double-precision matrix containing the binary numbers from 0 through 2^n...

8 years ago

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Cell joiner

You are given a cell array of strings and a string delimiter. You need to produce one string which is composed of each string fr...

8 years ago

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Which values occur exactly three times?

Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if x = [1 2...

8 years ago

Solved

Sum the elements in either diagonal of a square matrix

Sum the elements of a square matrix that lie on either the major diagonal or anti-diagonal.

8 years ago

Solved

Coin Tossing: Probability of Same Heads for N tosses

A pair of physicists toss a coin n times each. What is the probability that they tossed the same number of heads? *Input:*...

8 years ago

Solved

Happy 2013...

Happy 2013, everyone! An interesting tidbit about 2013 is that it is the first year since 1987 to contain four different digits...

8 years ago

Solved

Sum the Digits of a Number

Given an integer, sum the digits repeatedly until you end up with a single value less than 10. For example, if you add the di...

8 years ago

Question

Why replace isequalwithequalnans with isequaln?

Regarding the switch in 2012a [1]: Other Functionality Being Removed or Changed Functionality: isequalwithequalnans W...

8 years ago | 1 answer | 0

### 1

answerSolved

Magic is simple (for beginners)

Determine for a magic square of order n, the magic sum m. For example m=15 for a magic square of order 3.

8 years ago

Solved

Target sorting

Sort the given list of numbers |a| according to how far away each element is from the target value |t|. The result should return...

8 years ago

Solved

Return the largest number that is adjacent to a zero

This example comes from Steve Eddins' blog: <http://blogs.mathworks.com/steve/2009/05/27/learning-lessons-from-a-one-liner/ Lear...

8 years ago

Solved

The Goldbach Conjecture

The <http://en.wikipedia.org/wiki/Goldbach's_conjecture Goldbach conjecture> asserts that every even integer greater than 2 can ...

8 years ago

Solved

Path of least resistance

Find the length of the shortest path through the matrix from the top left to bottom right corner. You may move right, down, or d...

8 years ago

Solved

Basics: 'Find the eigenvalues of given matrix

Find the eigenvalues y for a given matrix x.

8 years ago

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Given a matrix, return the last eigen value

Given a matrix, return the first eigen value For example: x = magic(5) 17 24 1 8 15 23 5 7 14 ...

8 years ago

Solved

Create a Multiplication table matrix...

Create a product table in this format: P = [ 1 2 3 4 5; 2 4 6 8 10; 3 6 9 12 15; 4 8 12 1...

8 years ago

Solved

Subtract two positive numbers

Given a and b as a string, return b-a without using string to number conversion functions. a and b must to be a same size and b ...

8 years ago

Solved

What's Your BMI?

Find the body mass index. For reference, please refer to Wikipedia here: <http://en.wikipedia.org/wiki/Body_mass_index body ...

8 years ago

Solved

Add two numbers

Calculate the sum of two numbers. Example input = [2 3] output = 5

8 years ago

Solved

Get an array of month-ends in a date range

Create a function that would return a list of month-ends falling in a given date range. If a start date or end date falls on a...

8 years ago

Solved

Create a Cell array of month-end date strings within a provided date range

This is a variation of <http://www.mathworks.com/matlabcentral/cody/problems/1039-get-an-array-of-month-ends-in-a-date-range Get...

8 years ago