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Ryo Ishido


Last seen: 16 días ago Active since 2018

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  • Sequences And Series II Master
  • Matrix Manipulation II Master
  • Indexing II Master
  • Promoter
  • Strings I Master
  • CUP Challenge Master
  • ASEE Challenge Master
  • Cody5 Easy Master
  • Cody Problems in Japanese Master
  • Magic Numbers II Master
  • Sequences And Series I Master
  • Cody Challenge Master

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Solved


Find best domino orientation
Given a list of pairs, find the orientation they should be placed in a line, such that the sum of the absolute values of the dif...

15 días ago

Solved


Choose the best fitting dominoes
You will be given a cell array of nx2 matrices. Choose one row from each matrix. These are the ordered pairs that will be plac...

15 días ago

Solved


Find best placement for ordered dominoes (harder)
Given a list of ordered pairs, find the order they should be placed in a line, such that the sum of the absolute values of the d...

16 días ago

Solved


Find perfect placement of non-rotating dominoes (easier)
Given a list of ordered pairs, find the order they should be placed in a line, such that the sum of the absolute values of the d...

16 días ago

Solved


Chess probability
The difference in the ratings between two players serves as a predictor of the outcome of a match (the <http://en.wikipedia.org/...

alrededor de 1 mes ago

Solved


jogging?
Imagine x-y coordinate system and you are at the origin and your partner is on the x-axis at some small distance (d) away from y...

alrededor de 1 mes ago

Solved


Easy Sequences 12: 50th Prime
Write a function that outputs the th prime after a given number . For example, the th prime after is . NOTE: If itself is pr...

alrededor de 1 mes ago

Solved


Approximation of Pi (vector inputs)
Pi (divided by 4) can be approximated by the following infinite series: pi/4 = 1 - 1/3 + 1/5 - 1/7 + ... For a given numbe...

alrededor de 1 mes ago

Solved


Approximation of Pi
Pi (divided by 4) can be approximated by the following infinite series: pi/4 = 1 - 1/3 + 1/5 - 1/7 + ... For a given numbe...

alrededor de 1 mes ago

Solved


geometric progression
I've modified my <http://uk.mathworks.com/matlabcentral/cody/problems/2800-arithmetic-progression previous program> so that it n...

alrededor de 1 mes ago

Solved


arithmetic progression
I've written a program to generate the first few terms of <https://en.wikipedia.org/wiki/Arithmetic_progression arithmetic progr...

alrededor de 1 mes ago

Solved


Largest Geometric Series
Extension of Ned Gulley's wonderful <http://www.mathworks.com/matlabcentral/cody/problems/317 Problem 317>. In a geometric se...

alrededor de 1 mes ago

Solved


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

alrededor de 1 mes ago

Solved


Generate Square Wave
Generate a square wave of desired length, number of complete cycles and duty cycle. Here, duty cycle is defined as the fraction ...

alrededor de 1 mes ago

Solved


Sum of series VII
What is the sum of the following sequence: Σ(km^k)/(k+m)! for k=1...n for different n and m?

alrededor de 1 mes ago

Solved


Sum of series VI
What is the sum of the following sequence: Σk⋅k! for k=1...n for different n?

alrededor de 1 mes ago

Solved


Sum of series V
What is the sum of the following sequence: Σk(k+1) for k=1...n for different n?

alrededor de 1 mes ago

Solved


Sum of series IV
What is the sum of the following sequence: Σ(-1)^(k+1) (2k-1)^2 for k=1...n for different n?

alrededor de 1 mes ago

Solved


Sum of series III
What is the sum of the following sequence: Σ(2k-1)^3 for k=1...n for different n?

alrededor de 1 mes ago

Solved


Sum of series II
What is the sum of the following sequence: Σ(2k-1)^2 for k=1...n for different n?

alrededor de 1 mes ago

Solved


Sum of series I
What is the sum of the following sequence: Σ(2k-1) for k=1...n for different n?

alrededor de 1 mes ago

Solved


Find the next prime number
Find the next prime number or numbers for given n. For example: n = 1; out = 2; or n = [5 7]; out = [7 11]; ...

alrededor de 2 meses ago

Solved


Make a vector of prime numbers
Input(n) - length of vector with prime numbers Output(v) - vector of prime numbers Example: * n=1; v=2 * n=3; v=[2 3 5...

alrededor de 2 meses ago

Solved


Mersenne Primes
A Mersenne prime is a prime number of the form M = 2^p - 1, where p is another prime number. For example, 31 is a Mersenne prim...

alrededor de 2 meses ago

Solved


Find nearest prime number less than input number
Find nearest prime number less than input number. For example: if the input number is 125, then the nearest prime number whi...

alrededor de 2 meses ago

Solved


Mersenne Primes vs. All Primes
A Mersenne prime (M) is a prime number of the form M = 2^p - 1, where p is another prime number. <https://www.mathworks.com/matl...

alrededor de 2 meses ago

Solved


Multiply 2 numbers
Very easy, you just have to multiply 2 numbers but you cannot use the following signs (*, /, - ,^) ,mtimes , times, cross, pro...

alrededor de 2 meses ago

Solved


Television Screen Dimensions
Given a width to height ratio of a TV screen given as _w_ and _h_ as well as the diagonal length of the television _l_, return t...

alrededor de 2 meses ago

Solved


Easy Sequences 11: Factorial Digits without Trailing Zeros
Here is an easy one... It is not difficult to count the number of digits of the factorial of a given number. For example for 'n...

8 meses ago

Solved


Easy Sequences 10: Sum of Cumsums of Fibonacci Sequence
The function F(n) is defined as the set of Fibonacci numbers from the first up to the n-th. S(n) is the result of applying to F,...

8 meses ago

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