Gelöst

Determine whether a number is unprimeable
The number 204 is unprimeable because no single digit can be changed to make it prime. In contrast, the number 207 is not unprim...

fast 5 Jahre vor

Gelöst

Determine whether a number is a fibodiv number
The number 14 is a fibodiv number because you can divide it into 1 and 4, use those numbers as the seeds for a Fibonacci sequenc...

fast 5 Jahre vor

Gelöst

Borderline Connectivity
Compute the connected components of pixel borders. Suppose that h and v together describe a logical labeling of the borders b...

fast 5 Jahre vor

Gelöst

Find the nth nude number
The number 672 is a nude number because it openly displays three of its divisors: 6, 7, and 2. In other words, a nude number is ...

fast 5 Jahre vor

Gelöst

Metamorphosis
Inspired by problem <http://www.mathworks.com/matlabcentral/cody/problems/866-community-problem-500 866>. Can you make your c...

fast 5 Jahre vor

Gelöst

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...

fast 5 Jahre vor

Gelöst

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,...

fast 5 Jahre vor

Gelöst

Easy Sequences 9: Faithful Pairs
A "faithful number" is a non-prime number that is one less or one more than some prime number but not both. For example, for num...

fast 5 Jahre vor

Gelöst

Circular Segment Area
Let us consider a circle with radius . If we draw an angle (in radians) from the center of the circle, the two radii forming th...

fast 5 Jahre vor

Gelöst

Easy Sequences 8: Triangles with integer sides and prime perimeters
The triangle below is special. It has integer sides and a prime perimeter. Given an integer "n" we want to know how many t...

fast 5 Jahre vor

Gelöst

Easy Sequences 6: Coefficient sums of derivatives
Consider the polynomial function and its first-order derivative . The sums of the coefficients of P and P', are and , respecti...

fast 5 Jahre vor

Gelöst

Easy Sequences 5: Project Euler Problem 1 - Again!
We are all familiar with Project Euler Problem 1. This time let's try it on bigger multiples and larger range. Find the sum of ...

fast 5 Jahre vor

Gelöst

Project Euler: Problem 1, Multiples of 3 and 5
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23...

fast 5 Jahre vor

Gelöst

Easy Sequences 4: Eliminate the Days of Confusion
If a date is written in purely numeric format some dates can be confusing, if we don't know the date format used. For example, "...

fast 5 Jahre vor

Gelöst

Easy Sequences 3: Prime 44-number Squares
The positive integers 62 and 238 are related. Their squares (3844 and 56,644) both end in '44'. In fact, 62 and 238 are the 3rd ...

fast 5 Jahre vor

Gelöst

Easy Sequences 2: Trigonometric function with integral input and output
The function 'F', defined as: , will always return an integer if the input is a natural number (in radian...

fast 5 Jahre vor

Gelöst

choose the even number
find all even number in vector x Example: x = [1 2 3 4 5 6 7 8 9 10] y = [2 4 6 8 10]

fast 5 Jahre vor

Gelöst

Cell Operator *
Please implement operator * for cell: >> {2,3} * 2 ans = 1×4 cell array [2] [3] [2] [3] >> {2,3} * [2 3]...

fast 5 Jahre vor

Gelöst

Apply Function to Each Field of a Structure Array: Part 2
The builtin <http://www.mathworks.com/help/matlab/ref/structfun.html?=structfun structfun> applies a function handle to each fie...

fast 5 Jahre vor

Gelöst

Draw the flag of United Kingdom from 0 and 1.
Draw the flag of United Kingdom using 0 and 1. Exam: output n = 5 input y = [ 0 0 1 0 0 0 0 ...

fast 5 Jahre vor

Gelöst

Easy Sequences 1: Find the index of an element
The nth element of a series A is defined by: . Obviously, the first element A(1) = 1. Given the nth element 'A(n)', find the val...

fast 5 Jahre vor

Gelöst

Draw matrix 'Swiss flag'( Euro 2020)
Draw a x-by-x matrix 'Swiss flag' using '0' and '1'.(x is odd and bigger than 4) Example x=5 ...

fast 5 Jahre vor

Gelöst

Draw a x-by-x matrix British flag (Euro 2020)
Draw a x-by-x matrix 'British flag' using '0' and '1'.(x is odd and bigger than 4) x = 5 answer = [0 0 1 0 0 ...

fast 5 Jahre vor

Gelöst

Modify subscripts - easier
MATLAB supports object-oriented programming. Let's take an advantage of it in cody. This problem focus on modifying subscript...

fast 5 Jahre vor

Gelöst

Criss-Cross Verification: NHL
This Challenge is to verify a Criss-Cross matrix has no invalid words,contains all of the word set, and all are simply connected...

fast 5 Jahre vor

Gelöst

It's Happy! It's Fun! It's Happy Fun Hyperball!
Yes, it's Happy Fun Hyperball! The CODY sensation that's sweeping MATLAB nation! All you need to do to get your free Happy Fun H...

fast 5 Jahre vor

Gelöst

tetration
About tetration.

fast 5 Jahre vor

Gelöst

3n + 1 Problem (a.k.a The Collatz Conjecture)
The 3n + 1 problem (a.k.a The Collatz Conjecture) Consider the following algorithm to generate a sequence of numbers. Start wit...

fast 5 Jahre vor

Gelöst

Get to a number faster.
If you start with $1 and, with each move, you can either double your money or add another $1, what is the smallest number of mov...

fast 5 Jahre vor

Gelöst

Solve Sudoku puzzle step by
Sudoku is a famous puzzle. <https://en.wikipedia.org/wiki/Sudoku> Give a standard sudoku by a matrix (9*9), You need give a ...

fast 5 Jahre vor