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Mobius function
From <http://en.wikipedia.org/wiki/Möbius_function wikipedia>: For any positive integer n, define μ(n) as the sum of the prim...

6 years ago

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Not square-free number sequence
<http://oeis.org/A013929 Not square-free numbers> are all positive integers divisible by a square greater than one: 4, 8, 9, 12,...

6 years ago

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Sphenic number sequence
<http://oeis.org/A007304 Sphenic numbers> are positive integers that are products of three distinct prime numbers: 30, 42, 66, 7...

6 years ago

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Self-similarity 3 - Every other pair of terms
Self-similar integer sequences are certain sequences that can be reproduced by extracting a portion of the existing sequence. Se...

6 years ago

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Self-similarity 2 - Every third term
Self-similar integer sequences are certain sequences that can be reproduced by extracting a portion of the existing sequence. Se...

6 years ago

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Self-similarity 1 - Every other term
Self-similar integer sequences are certain sequences that can be reproduced by extracting a portion of the existing sequence. Se...

6 years ago

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Who invented zero?
We know the importance zero in computer science, mathematics... but who invented zero? Clue: He was the first in the line ...

6 years ago

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Help the Patriots get to the Super Bowl
Given a football by the Patriots, return it to them with 2 psi less air in it. (The original psi is passed as a number to the...

6 years ago

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Calculate some equation
Using given inputs x and z, make two outputs that are y1 = (xz)/(x/z)^2 + 14x^2 - 0.8z^2 y2 = x^z - z^x + (x/z)^2 - (z/x...

6 years ago

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Calculate geostrophic current
eta0=0.01; R=300; f=0.01; g=9.81; x=-500:50:500; y=-500:50:500; [x y]=meshgrid(x,y); eta=eta0*exp(-(x.^2+...

6 years ago

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Change string to number
Change given string to number. (hint: there is already function) Changing from ['1234'] to [1234] is one of example

6 years ago

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Find x in provided equation!
x^2-2*x+1=0 This polynomial can be expressed by using each term's coefficients, such as [1 -2 1]. Using the polynomial ...

6 years ago

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Print true if
all elements are larger than 5 a=[1 3 5 8 6]; b=[6 6 6 6 6]; function(a) should be false, and function(b) will be tru...

6 years ago

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How to calculate log?
There is a log that have base 5. How to calculate? log5(x)?

6 years ago

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Subtract two positive numbers
Given a and b as a string, return b-a without using string to number conversion functions. a and b must to be a same size and b ...

6 years ago

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When can one be the Life Member of the IEEE?
Consult the site http://en.wikipedia.org/wiki/Ieee from where it can be seen that IEEE Members who have reached the age of 65 an...

6 years ago

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matrix of natural number
Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 resides seially as shown in the examples below. ...

6 years ago

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Product of elements in row
Product of matrix such that a=[3 3 1] b=9

6 years ago

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Sum the 'edge' values of a matrix
Sum the 'edge' values of an input matrix (the values along the perimeter). Example [1 2 3 4 5 6 7 8 9] Output = ...

6 years ago

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Wind Chill Computation
On a windy day, a temperature of 15 degrees may feel colder, perhaps 7 degrees. The formula below calculates the "wind chill," i...

6 years ago

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If-then-else
Complete the function below such that if the value of x is in the range 10 to 14, inclusive, the value 18 is assigned to y. Oth...

6 years ago

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Powers Of
Fill the vector with powers of 2, so that vector(1) is 2^1, vector(2) is 2^2, etc. Stop with vector(10). Complete the function ...

6 years ago

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Solving Quadratic Equations (Version 2)
Before attempting this problem, solve version 1: <https://www.mathworks.com/matlabcentral/cody/problems/2510-solving-quadratic-...

6 years ago

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Solving Quadratic Equations (Version 1)
Quadratic equations have the form: ax^2 + bx + c = 0. Example: x^2 + 3x + 2 = 0, where a = 1, b = 3, and c = 2. The equation has...

6 years ago

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counting for loop
Complete the function below using a for loop to count from 3 to N by 2. For example, if N is 10, count 3, 5, 7, 9 and stop. Fo...

6 years ago

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Max of a Vector
Write a function to return the max of a vector

6 years ago

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Back to basics 17 - white space
Covering some basic topics I haven't seen elsewhere on Cody. Remove the trailing white spaces from the input variable

6 years ago

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Back to basics 15 - classes
Covering some basic topics I haven't seen elsewhere on Cody. Return the class of the input variable.

6 years ago

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Back to basics 20 - singleton dimensions
Covering some basic topics I haven't seen elsewhere on Cody. Remove the singleton dimensions from the input variable (e.g. if...

6 years ago

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Back to basics 15 - Benchmark
Covering some basic topics I haven't seen elsewhere on Cody. Return an array of the benchmark values for MATLAB.

6 years ago