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Back to basics 1 - Saving

Covering some basic topics I haven't seen elsewhere on Cody. Given an input variable 'x', save it to disk in a file named 'co...

8 years ago

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A matrix of introverts

You are given a matrix full of numbers who happen to be very shy. Write a MATLAB function that will put a square of zeros aroun...

8 years ago

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A matrix of extroverts

Now that the introverts have had their script, the extroverts spoke up (naturally!) and demanded one as well. You will be given...

8 years ago

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Narcissistic number ?

Inspired by Problem 2056 created by Ted. In recreational number theory, a narcissistic number is a number that is the sum of ...

8 years ago

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remove nans fast

There are several ways to locate and remove nans in a matrix, and return an 1d row vector. In this problem the challenge is ...

8 years ago

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Compute a dot product of two vectors x and y

x and y are input vectors, d is a number and contains their dot product

8 years ago

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poll: would you like the regexp (?@cmd) functionality to be banned in Cody?

This problem is a poll (and a little bit of "white hat hacktivism" as well) regarding Cody users sentiment about the use of rege...

8 years ago

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Determine Whether an array is empty

Input a matrix x, output y is TRUE if x is empty, otherwise FALSE.

8 years ago

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Find a Pythagorean triple

Given four different positive numbers, a, b, c and d, provided in increasing order: a < b < c < d, find if any three of them com...

8 years ago

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Side of a rhombus

If a rhombus has diagonals of length x and x+1, then what is the length of its side, y? <<http://upload.wikimedia.org/wikipe...

8 years ago

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Is this triangle right-angled?

Given any three positive numbers a, b, c, return true if the triangle with sides a, b and c is right-angled. Otherwise, return f...

8 years ago

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Consecutive Powers

Return 2 numbers and 2 powers such that their difference is 1 A 4 element row vector is expected: x where x(1)^x(2) - x(...

8 years ago

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Half-Swap

Given a vector with an even number of elements, rearrange it so that the elements in its first half are switched with those i...

8 years ago

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Number of problems

No, you don't read it wrong: this assignment is to return the number of this problem (and not the problem of this number).

8 years ago

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Tony's trick for duplicating an mx1 vector n times

Without using repmat, or for loop, or concatenation, create a function to duplicate a vector, v, a specified number of times, n....

8 years ago

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Find out the best cricketer

Irrespective of input, return Sachin Tendulkar as a output

8 years ago

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Insert certain elements into a vector.

We start with vector V. Some values W will be inserted into V, at positions U. Say, |V| contains |[1 2 3 4 5]| and |W| is |[0...

8 years ago

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"Find out the best cricket"

This is how I originally read Problem 2013, so let's just go with it. Give me the first and last name of the best cricket, rega...

8 years ago

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SchrÃ¶dinger dog

Everyone knows that dogs are less unpredictable than cats. But is that proven? Is that measurable at all? YES! NOW IT IS! ...

8 years ago

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Number Persistence

A number's persistence is the number of steps required to reduce it to a single digit by multiplying all its digits to obtain a ...

8 years ago

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Remove the middle element from a vector

Remove the middle element of a vector? *Example:* [1,2,3] should return 2 [1,2,3,4] should return 2 [] should return...

8 years ago

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Palindrome

Check if a given string is a palindrome or not. For example, a = 'amoreroma' is a palindrome. But b = 'xyz' is not. Return...

8 years ago

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Remove element(s) from cell array

You can easily remove an element (or a column in any dimension) from a normal matrix, but assigning that value (or range) empty....

8 years ago

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Find the index of the first occurrence of a value in a matrix

Given a matrix of scalars, find the first occurrence of -1 in each column. Output NaN for a column which does not contain the va...

8 years ago

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Elapsed Time

Given two date strings d1 and d2 of the form yyyy/mm/dd HH:MM:SS (assume hours HH is in 24 hour mode), determine how much time, ...

8 years ago

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Nearest Numbers

Given a row vector of numbers, find the indices of the two nearest numbers. Examples: [index1 index2] = nearestNumbers([2 5 3...

8 years ago

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Return the largest number that is adjacent to a zero

This example comes from Steve Eddins' blog: <http://blogs.mathworks.com/steve/2009/05/27/learning-lessons-from-a-one-liner/ Lear...

8 years ago

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LIFO Validation

Write a function to check whether a LIFO (Last In First Out) restriction on inventory is violated. We have two input vectors ...

8 years ago

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Find the largest value in the 3D matrix

Given a 3D matrix, A, find the largest value. E.g. >> A = 1:9; >> A=reshape(A,[3 1 3]); >> islargest(A) ans = 9

8 years ago