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Matrix multiplication across rows

Given matrix m, return matrix n such that, rows of n are result of multiplication of the rows of the input matrix Example ...

9 months ago

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Natural numbers in string form

Create a cell array of strings containing the first n natural numbers. _Slightly_ harder than it seems like it should be. Ex...

9 months ago

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Back to basics 23 - Triangular matrix

Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix, return a matrix with all elements above a...

9 months ago

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Back to basics 21 - Matrix replicating

Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix, generate an output matrix that consists o...

9 months ago

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surrounded matrix

With a given matrix A (size m x n) create a matrix B (size m+2 x n+2) so that the matrix A is surrounded by ones: A = [1 2 ...

9 months ago

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Rotate input square matrix 90 degrees CCW without rot90

Rotate input matrix (which will be square) 90 degrees counter-clockwise without using rot90,flipud,fliplr, or flipdim (or eval)....

9 months ago

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Matrix with different incremental runs

Given a vector of positive integers a = [ 3 2 4 ]; create the matrix where the *i* th column contains the vector *1:a(i)...

9 months ago

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Make an awesome ramp for a tiny motorcycle stuntman

Okay, given a vector, say v=[1 3 6 9 11], turn it into a matrix 'ramp' like so: m=[1 3 6 9 11; 3 6 9 11 0; 6 9 ...

9 months ago

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Removing rows from a matrix is easy - but what about inserting rows?

Assume A is a 5-by-5 matrix. A([2,4],:) = [] is a quick way to remove rows 2 and 4. Can you find a quick way to insert rows into...

9 months ago

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Permute diagonal and antidiagonal

Permute diagonal and antidiagonal For example [1 2 3;4 5 6;7 8 9] -> [3 2 1;4 5 6;9 8 7] WITHOUT diag function (and variable n...

9 months ago

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Remove the air bubbles

Given a matrix a, return a matrix b in which all the zeros have "bubbled" to the top. That is, any zeros in a given column shoul...

9 months ago

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Check if a matrix Diagonal is equal to its secondary diagonal

Your function should return True if the secondary diagonal is equal to diagonal, and False otherwise. Eg: M = [1 2 1 ...

9 months ago

Problem

Check if a matrix Diagonal is equal to its secondary diagonal

Your function should return True if the secondary diagonal is equal to diagonal, and False otherwise. Eg: M = [1 2 1 ...

9 months ago | 0 | 31 solvers

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An Ohm's Law Calculator

*BACKGROUND / MOTIVATION:* Many important observations in math and science can be described by short, but powerful, equations...

9 months ago

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Laws of motion 4

Given the initial velocity 'u', final velocity 'v' and acceleration 'a', find the distance travelled.

9 months ago

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Set some matrix elements to zero

First get the maximum of each *row*, and afterwards set all the other elements to zero. For example, this matrix: 1 2 3 ...

9 months ago

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Flip the main diagonal of a matrix

Given a n x n matrix, M, flip its main diagonal. Example: >> M=magic(5); >> flipDiagonal(M) 9 24 1 ...

9 months ago

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Remove NaN ?

input -> matrix (n*m) with at least one element equal to NaN; output -> matrix(p*m), the same matrix where we deleted the enti...

9 months ago

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Reverse the elements of an array

Reverse the order of elements in an array: eg: input X = [ 1 2 3 ; 4 5 6 ; 7 8 9 ] o...

9 months ago

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Generate Square Wave

Generate a square wave of desired length, number of complete cycles and duty cycle. Here, duty cycle is defined as the fraction ...

9 months ago

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Sum of series VII

What is the sum of the following sequence: Σ(km^k)/(k+m)! for k=1...n for different n and m?

9 months ago

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Sum of series VI

What is the sum of the following sequence: Σk⋅k! for k=1...n for different n?

9 months ago

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Sum of series V

What is the sum of the following sequence: Σk(k+1) for k=1...n for different n?

9 months ago

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Sum of series IV

What is the sum of the following sequence: Σ(-1)^(k+1) (2k-1)^2 for k=1...n for different n?

9 months ago

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Sum of series III

What is the sum of the following sequence: Σ(2k-1)^3 for k=1...n for different n?

9 months ago