Community Profile

# David

### eSolar / Harvey Mudd College Alumnus

57 total contributions since 2012

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

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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 ...

environ 4 ans 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...

environ 4 ans ago

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

presque 8 ans ago

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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...

presque 8 ans ago

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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, ....

presque 8 ans 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...

presque 8 ans ago

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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...

presque 8 ans 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...

presque 8 ans 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...

presque 8 ans 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...

presque 8 ans 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...

presque 8 ans ago

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Generate pi using logarithm
Generate pi using logarithm

presque 8 ans ago

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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.

presque 8 ans 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:*...

presque 8 ans 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...

presque 8 ans 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...

presque 8 ans ago

Question

Why replace isequalwithequalnans with isequaln?
Regarding the switch in 2012a [1]: Other Functionality Being Removed or Changed Functionality: isequalwithequalnans W...

presque 8 ans ago | 1 answer | 0

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Solved

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.

presque 8 ans ago

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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...

presque 8 ans ago

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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...

presque 8 ans 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 ...

presque 8 ans ago

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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...

presque 8 ans ago

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Basics: 'Find the eigenvalues of given matrix
Find the eigenvalues y for a given matrix x.

presque 8 ans 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 ...

presque 8 ans 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...

presque 8 ans 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 ...

presque 8 ans ago

Solved

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

presque 8 ans ago

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

presque 8 ans 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...

presque 8 ans 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...

presque 8 ans ago