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Ugly numbers - 02
Ugly numbers are those whose prime factors are 2, 3 or 5. find the nth ugly number. n.b. unlike the previous problem,trivi...

4 years ago

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Ugly numbers - 03
For this case, a number is defined ugly if it has prime factors consisting of only elements of x. Find the nth ugly number. ...

4 years ago

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Ugly numbers - 01
Ugly numbers are those whose prime factors are 2, 3 or 5. find the nth ugly number.

4 years ago

Problem

Easy Sequences 44: Finding the Smallest Number whose Cube is divisible by a Factorial
Given a integer , our goal is to find the smallest integer , such that divides . For example, for , , because , (since ), and ...

4 years ago | 1 | 7 solvers

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Odd times 3
Given a input matrix x, multiply all odd values by 3. Even values remain the same. example: x = [1 2 3 4 5;... 6 7...

4 years ago

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Calculate the Levenshtein distance between two strings
This problem description is lifted from <http://en.wikipedia.org/wiki/Levenshtein_distance>. The Levenshtein distance betwee...

5 years ago

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Given two arrays, find the maximum overlap
Given two arrays s1 and s2, create a new array s3 which is as short as possible and contains both arrays. If s1 = [1 2 3 4 5]...

5 years ago

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create a square matrix
create a [n*n] matrix. example: mat(4)= [ 1 4 9 16 4 4 9 16 9 9 ...

5 years ago

Solved

Calculate inverse matrix in m by n matrix
x=(1:10)' y=roundn(2*x+7*rand(size(x)),-1) a*x=y Estimate a using inverse matrix calculation. This is principle of li...

5 years ago

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Find Logic 31

5 years ago

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Find the next binary palindrome number
We all know, a *palindrome* is nothing but a number or character which remains the same after the forward or backward alteration...

5 years ago

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Ratio between sum of primes and sum of factors
Write a function that calculates the ratio between the sum of primes numbers lower or equal to x, and the sum of the factors of ...

5 years ago

Solved

Primes Checker
Given variable inputs Check if they are prime numbers

5 years ago

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Diagonal & Anti-Diagonal Matrix: Easy
Create a matrix as shown below from "magic" square. For example: if input x=9;then use mgic(x) and create the matrix...

5 years ago

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Convert Hard Drive marketing sizes to actual data sizes
Hard drive sizes are typically marketed using the decimal meaning of prefixes, whereas RAM uses binary meanings. For example: ...

5 years ago

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Iterative sum of digits of 2^n number
Given n, calculate the number 2^n (where n>=0) and *iterate* until the sum of the digits is a single-digit number. Example: ...

5 years ago

Solved

Infernal Recursion
Consider the recursion relation: x_n = (x_(n-1)*x_(n-2))^k Given x_1, x_2, and k, x_n can be found by this definition. Wr...

5 years ago

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find the lowest number with given amount of integer factors

5 years ago

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Love triangles
Given a vector of lengths [a b c], determines whether a triangle with non-zero area (in two-dimensional Euclidean space, smarty!...

5 years ago

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Integer to boolean
Write a general function that will create the following conversation; Input is a column vector with integers Output is a b...

5 years ago

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Detect a number and replace with two NaN's
Write code which replaces the number 1 with two NaNs. Example X = [ 1 2 NaN 4 1 3 7 NaN 1 4 NaN 2] ...

5 years ago

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Create logarithmically spaced values (★)
Given three numbers a,b,n with b>a, create a vector y with n logarithmic spaced values between 10^a and 10^b. Thus, if a = -2, ...

5 years ago

Solved

Sum of elements in a vector (★)
(copy of Prob. 3) Find the sum of all the numbers of the input vector x. Input x = [1 2 3 5] Output y is 11 <> ...

5 years ago

Solved

I'm going to enjoy watching you calculate, Mr Anderson
Smith numbers are numbers such that if you add up all of the digits in the number, that sum equals the sum of all of the digits ...

5 years ago

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Leading-zero padding
Write a function that will add leading-zero padding to all numbers in the supplied vector, as necessary, based on the maximum nu...

5 years ago

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JOIN STRINGS
There are two given strings 'STRING1' and 'STR ING2'.|monospaced|The output should be 'STRING1 STR ING2' or STr1='Sum';STr2='EQU...

5 years ago

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Bit calculation
Give me the count of numbers from 1 to n having their last two bits as 0. For example function y = ret_count(4) y = x...

5 years ago

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Find Logic 21

5 years ago

Solved

Find Logic 32

5 years ago

Solved

Remove the air bubbles from a vector
_*A reduced version of Problem 112*_ Given a column vector v, return a vector w in which all the zeros have "bubbled" to the ...

5 years ago