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John Booker

MathWorks

Last seen: 12 días hace |  Con actividad desde 2011

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I'm a user experience specialist at MathWorks where I get to do a lot of fun things. The big two are: making MATLAB easier to use, and helping MATLAB Central to better serve the community.
Professional Interests: gamification, information visualization, user experience

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Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

casi 3 años hace

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Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

casi 11 años hace

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Most nonzero elements in row
Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

más de 11 años hace

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Simple problem creating a function from an abstract specification.
MYSTERYFUNCTION3 This takes a vector of numbers v and computes a vector w such the w[i] is the average of v[i] and the previous...

más de 11 años hace

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Create times-tables
At one time or another, we all had to memorize boring times tables. 5 times 5 is 25. 5 times 6 is 30. 12 times 12 is way more th...

más de 11 años hace

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Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

casi 12 años hace

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

casi 12 años hace

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Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

casi 12 años hace

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Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

casi 12 años hace

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Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

casi 12 años hace

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Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

casi 12 años hace

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Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

alrededor de 12 años hace

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Is my wife right?
Regardless of input, output the string 'yes'.

alrededor de 12 años hace

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Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

alrededor de 12 años hace

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Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

alrededor de 12 años hace

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Add two numbers
Given a and b, return the sum a+b in c.

alrededor de 12 años hace

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Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

alrededor de 12 años hace

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Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

alrededor de 12 años hace

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Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

alrededor de 12 años hace

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Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

alrededor de 12 años hace

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Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

más de 12 años hace

Pregunta


How to extract leading non-zero digit?
I'm working on a research problem related to Benford's Law which states that the distribution of leading digits is not random. T...

casi 14 años hace | 4 respuestas | 6

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