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Find the inverse permutation

Given a permutation vector perm (a vector of n elements containing all the elements from 1 to n in some order), return the permu...

8 months ago

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Swap the first and last columns

Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

5 years ago

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Find the sum of all the numbers of the input vector

Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

5 years ago

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Make the vector [1 2 3 4 5 6 7 8 9 10]

In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

5 years ago

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Times 2 - START HERE

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

5 years ago

Question

How to put names on the six faces of a cube so that they do not disappear in the cube?

Vertices = [0 0 0; 1 0 0; 1 1 0; 0 1 0; 0 0 1; 1 0 1; 1 1 1; 0 1 1]; Faces = [1 2 6 5; ...

5 years ago | 1 answer | 0

Question

Error message by linprog

I try to solve an LP problem with data A,b,c,lo,hi by using the command [x,fval,exitflag,output] = linprog(c, [], [], A,...

7 years ago | 0 answers | 0

Question

How to remove dependent rows in a matrix?

Let A be an m by n matrix whose rows are linearly dependent. I want to remove rows from A such that the rank does not decrease....

8 years ago | 3 answers | 0

Question

removing element from all arrays in cell array of 1-dimensional arrays

I have a cell array out = cell(n,1), and each out{j}, 1<= j <= n, is a vector of integers. These vectors have different lengths....

9 years ago | 2 answers | 1

Solved

Increment a number, given its digits

Take as input an array of digits (e.g. x = [1 2 3]) and output an array of digits that is that number "incremented" properly, (i...

9 years ago

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Most nonzero elements in row

Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

9 years ago

Solved

Back and Forth Rows

Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

9 years ago

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Pizza!

Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

9 years ago

Solved

Remove any row in which a NaN appears

Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

9 years ago

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Find all elements less than 0 or greater than 10 and replace them with NaN

Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

9 years ago

Solved

Fastest shortest-path-finder in the west

Given connectivity information about a graph, your job is to find the <http://en.wikipedia.org/wiki/Shortest_path_problem *short...

9 years ago

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Give the Shortest Path Through The Maze

*Description* The purpose of this problem is to give the shortest path through a maze. The maze will be provided in a codifie...

9 years ago

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How many palindromes?

* Given a set of letters, count all possible palindromes, using all of those letters. * For example, if the set is {'A' 'A' 'A'...

9 years ago

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Find the two most distant points

Given a collection of points, return the indices of the rows that contain the two points most distant from one another. The inpu...

9 years ago

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Maximum running product for a string of numbers

Given a string s representing a list of numbers, find the five consecutive numbers that multiply to form the largest number. Spe...

9 years ago

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Make a Palindrome Number

Some numbers like 323 are palindromes. Other numbers like 124 are not. But look what happens when we add that number to a revers...

9 years ago

Solved

Finding Perfect Squares

Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

9 years ago

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De-dupe

Remove all the redundant elements in a vector, but keep the first occurrence of each value in its original location. So if a =...

9 years ago

Solved

Summing Digits within Text

Given a string with text and digits, add all the numbers together. Examples: Input str = '4 and 20 blackbirds baked in a...

9 years ago

Solved

Making change

Given an amount of currency, return a vector of this form: [100 50 20 10 5 2 1 0.5 0.25 0.1 0.05 0.01] Example: Input a = ...

9 years ago

Solved

Make one big string out of two smaller strings

If you have two small strings, like 'a' and 'b', return them put together like 'ab'. 'a' and 'b' => 'ab' For extra ...

9 years ago

Solved

Omit columns averages from a matrix

Omit columns averages from a matrix. For example: A = 16 2 3 13 5 11 10 8 9 7 ...

9 years ago

Solved

Magic!

Check whether the input matrix is a normal magic square: <http://en.wikipedia.org/wiki/Magic_square> Output the logical va...

9 years ago

Solved

Love triangles

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

9 years ago