Alexander Ross

Last seen: 27 days ago | Active since 2024

Followers: 0 Following: 0

Message

I use MATLAB primarily for neuroimaging preprocessing applications.

Statistics

RANK
134
of 160,651

CONTRIBUTIONS
0 Problems
709 Solutions

SCORE
9,452

NUMBER OF BADGES
38

View badges

Feeds

Solved

Now 20% off!
Furloughs are hitting government workers this year. To commemorate getting one unpaid day off each week until the end of Septem...

1 month ago

Solved

Rolling maximums above a threshold
You are given either a vector or a 2-D matrix M and a threshold value of t. Write a script that will calculate how many times t...

1 month ago

Solved

That's some divisor you've got there...
Given a positive integer x, calculate the sum of all of the divisors of the number. Please include the number itself in your fi...

1 month ago

Solved

Converting numbers back from extended form
Thanks for all the help you guys gave me on writing out the numbers in extended form in <http://www.mathworks.com/matlabcentral/...

1 month ago

Solved

Numbers in extended form
Shhhhhhh. Don't tell my daddy, but I'm borrowing his Cody account so all of you very smart people can help me out. I just star...

1 month ago

Solved

Is X a Fibonacci Matrix?
In honor of Cleve's new blog and post: <http://blogs.mathworks.com/cleve/2012/06/03/fibonacci-matrices/> Is X a Fibonacci ...

2 months ago

Solved

Integer Sequence - II : New Fibonacci
Crack the following Integer Sequence. (Hints : It has been obtained from original Fibonacci Sequence and all the terms are also ...

2 months ago

Solved

"Look and say" sequence
What's the next number in this sequence? * [0] * [1 0] * [1 1 1 0] * [3 1 1 0] * [1 3 2 1 1 0] This a variant on the w...

2 months ago

Solved

Weighted average
Compute the weighted average Y, of the vector A, given the weight vector W. The weighted average is the sum of the dot produc...

2 months 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, ...

2 months ago

Solved

Generate a list of composite numbers

2 months ago

Solved

Find similar sequences
Another problem inspired by a question on the <http://www.mathworks.com/matlabcentral/answers answers> forum. Given a matrix ...

2 months ago

Solved

Largest Geometric Series
Extension of Ned Gulley's wonderful Problem 317. In a geometric series, ratio of adjacent elements is always a constant value. ...

2 months ago

Solved

The Hitchhiker's Guide to MATLAB
Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

2 months ago

Solved

Make one vector from two others
You are given two vectors of equal length. Your task is to create a MATLAB script that will repeat all of the values in the fir...

2 months ago

Solved

Give me Hamming on five, hold the mayo
A Hamming Number is a positive number that has no prime factor greater than 5. Given a number X, determine how many Hamming num...

2 months ago

Solved

Calculate the number of elements in a matrix.
Calculate the number of elements in a matrix.

2 months ago

Solved

Missing five
Convert decimal numbers to a base-9 notation missing the digit *5* <<http://www.alfnie.com/software/missing5.jpg>> Too man...

2 months ago

Solved

Higher! Lower! Correct!
In he game of "Guess the number", the game leader mentally pictures a number between a lower and higher number, and then asks th...

2 months ago

Solved

It's going down. We're finding simbers!
This problem is inspired by Project Euler 520: Simbers. "We define a simber to be a positive integer in which any odd digit, ...

2 months ago

Solved

Out-of-Place Elements Count
Determine the number of elements in a list of integers that are not in their original order after sorting the list in ascending ...

2 months 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] ) == [...

2 months ago

Solved

Find the largest sum of any contiguous subarray
Given an array of N integers, find the contiguous subarray (which must contain at least one number) with the maximum sum and ret...

2 months ago

Solved

Convert a vector into numbers
Suppose a vector x = [ 1 2 4 7] is given. You have to convert this vector into string number y = '1247'. Examples x = [ 1...

2 months ago

Solved

Binary Inversion
Given the unsigned 8-bit integer x, return the number y which is the binary inversion of x. For example if x is 5, y should b...

2 months ago

Solved

Generalised Hamming Number
Inspired by Project Euler n°204 and Problem 1308 by James A generalised Hamming number of type n, has no prime factor larger ...

2 months ago

Solved

Reverse Calculator
Use this reverse calculator and give correct output Its simple, In my Reverse calculator if you press 0 it will be considered...

2 months ago

Solved

Additive persistence
Inspired by Problem 2008 created by Ziko. In mathematics, the persistence of a number is the *number of times* one must apply...

2 months ago

Solved

Ripping numbers apart!
So you have to "rip" a number apart into individual digits... The end output is a cell. That is if: x = 12345678 o...

2 months ago

Solved

7 segment LED display
Given a whole number, output how many segments would be lit up to display it on a 7 segment LED display (see Wikipedia: http://e...

2 months ago