Tim

Last seen: Today | Active since 2012

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Retired mathematician.

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5-year Annedversaries
This is the Bonus Round problem for the 2025 Cody Contest. Attend the watch party on Friday, March 27 to see how 6 champions fro...

1 day ago

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Turn year differences into "s score and y years ago"
President Lincoln opened his now-legendary Gettysburg Address with the famous words "Four score and seven years ago...". Given t...

1 day ago

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Play Oware with the digits of a number
Oware is a pit and pebble game that consists of two sets of pits or houses filled with pebbles or seeds. During a turn, a player...

7 days ago

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Determine Matrix Dimensions Without Using some built-in MATLAB functions, version 2
Write a function that takes a 2D matrix/1D vector x as input and returns a row vector containing the number of rows and the numb...

14 days ago

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Sum all elements of a vector or matrix without using sum()
Write a function that computes the sum of all elements of the input array v without using the built-in sum function. The input ...

15 days ago

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Determine Matrix Dimensions Without Using some built-in MATLAB functions
Write a function that takes a 2D matrix/1D vector x as input and returns a row vector containing the number of rows and the numb...

15 days ago

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Determine Matrix Dimensions Without Using size or length
Write a function that takes a matrix A as input and returns a row vector containing the number of rows and the number of columns...

17 days ago

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Where is the number that you want to find?
For a given matrix A, find where the input number x appears. Do this task by returning the vector which contains the row and th...

1 month ago

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Simulate full-stop emergency braking scenario.
Emergency braking events demand rapid deceleration to bring the vehicle safely to rest. Given initial vehicle speed and constant...

1 month ago

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Filled Diamond Pattern
Create an N×N binary matrix that forms a filled diamond shape centered in the matrix. The diamond expands symmetrically toward t...

1 month ago

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Hollow Diamond Pattern
Create an N×N matrix that forms a hollow diamond shape using 1s, leaving the interior empty. This challenge emphasizes boundary ...

1 month ago

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Concentric Squares Mandala
Generate concentric square rings of alternating 1s and 0s to form a layered mandala-style matrix. e.g. N = 5; 1 1 1 1 1;...

1 month ago

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Diagonal Cross Mandala
Generate an N×N matrix with diagonals highlighted to form an artistic X-shaped mandala pattern. e.g. N = 5; 1 0 0...

1 month ago

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Circular Ring Approximation Mandala
Generate a matrix that approximates a circular ring using distance-based thresholding , a visually rich mandala-inspired challen...

1 month ago

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Plus Cross Mandala
Create a symmetrical plus (+) shaped pattern centered in an N×N matrix.

1 month ago

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Vertical Mirror Mandala
Create a symmetric left-right mirrored pattern in an N×N matrix to emulate mandala reflection symmetry. e.g. N = 5; ...

1 month ago

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Hourglass Mandala
Generate an hourglass shape using matrix geometry and symmetry. e.g. N = 5; 1 1 1 1 1; 0 1 1 1 0; ...

1 month ago

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Starburst Mandala
Create a mandala starburst using diagonal and orthogonal symmetry in a matrix.

1 month ago

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Rotating the plane region bounded by two polynomials
Let p and q be n-degree and m-degree polynomials with n >= m >= 1. Consider clockwise rotate the plane region bounded by these t...

1 month ago

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Spiral Mandala
Generate a clockwise spiral pattern using 1s in an N×N matrix to create an intricate mandala effect. e.g. N = 5; y_correct...

1 month ago

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Built-out FFTShift
The task in hand is to replicate the built-in function - fftshift (with single input), but without using the function. However,...

1 month ago

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Find record values in a sequence
Write a function to find the record values in a sequence—that is, the largest values seen since the start. For example, if the s...

2 months ago

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Gather primes
A book titled Gather that I regularly see inspired this game: make as many words as possible from the letters in the word GATHER...

2 months ago

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Sudoku square
We have a small Sudoku square, but one number is missing. x = [ 1 5 4 8 6 3 0 9 7 ] Make a function, wher...

2 months ago

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Gene Duplication with Sequencing Errors
You are investigating the genome of the bacterium Codex matlabius. A virus that infects C. matlabius is known to insert long, re...

2 months ago

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How Long is the Border Between Unitopia and Zerostan?
Two countries, Unitopia (denoted by ones) and Zerostan (denoted by zeros) are engaged in a long-standing dispute: how long is th...

2 months ago

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FEN to Chess Board
Note: This problem is the reverse, or complement, of Problem 61144 - FEN Chess Notation. Given a FEN (Forsyth-Edwards Notation)...

2 months ago

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Two Sum
Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You m...

2 months ago

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Container With Most Water
You are given an integer array height . There are vertical lines drawn such that the two endpoints of the ith line are (i, 1) an...

2 months ago

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Does the coin touch the line?
If we throw a coin that has a diameter of d, its center will land in a grid n x m. What is the probability that the coin land...

2 months ago