# Rik

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E-mails with feedback/questions about FEX submissions are welcomed. In general I will post e-mails about Answers on the related page, unless there is good cause not to do so.

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**Feeds**

Solved

Create cell array of numeric arrays

Convert the input to a cell array, but only if necessary. If the input is a numeric array, return a 1-by-1 cell array contain...

2 years ago

Solved

Low level NaN

* I have a dataset. Columns represents different variables. * A variable may start with NaN or any double type number. * If i...

2 years ago

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Is the input divisible by 3?

Return true if the input is divisible by 3 and false if not.

2 years ago

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Ridge regularized linear regression

Given a predictor data matrix of size , target variable vector of size and a shrinkage factor (scalar) (ridge regularization...

2 years ago

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String Logic 3

Example: 'CAT' --> 'RPI' 'DOG' --> 'SDV' 'MATLAB' --> 'BPIAPQ' 'ROSY' --> 'GDHN' 'TRUST' --> 'IGJHI' 'MOSTLY' --> 'BDHI...

2 years ago

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For a given linear index as input for n sized square matrix, find corresponding row and column.

If input is 1, the row and column will be 1 and 1 respectively.

2 years ago

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Unique - Very Very Large Numbers

Given a vector column, with some very large numbers, create the ascending sort and unique vector. *Input:* A (column vector)...

2 years ago

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Find files with extension ext in the current directory

List all files with extension 'ext' in the current directory. Return a char matrix with the name of files in rows. Return 0 if...

2 years ago

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Global usage

This Challenge is to utilize Global variables. Global variables are risky as the subroutine may inadvertently and unwantingly...

2 years ago

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Determina si el número es primo

Primero, antes que nada: ¿Qué es un número primo? Un número primo es cualquier número que solamente se puede dividir por 1 y ...

2 years ago

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Maximum of ND-array

Find the maximum element of a N dimensional array. Example: A=[1 2 4 ; -20 4 10]; The maximum is 10.

2 years ago

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Sum of Arithmetic Progression

Given the starting number, difference and the number of terms - find the sum of the arithmetic progression.

2 years ago

Solved

There are 10 types of people in the world

Those who know binary, and those who don't. The number 2015 is a palindrome in binary (11111011111 to be exact) Given a year...

2 years ago

Solved

Numerical Integration

Input * |x0|, a real number greater than 0 Output * |I|, a numerical estimate of the integral x0 / I...

2 years ago

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Differential equations I

Given a function handle |f| an initial condition |y0| and a final time |tf|, solve numerically the differential equation dy...

2 years ago

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Monte-Carlo integration

Write a function that estimates a d-dimensional integral to at least 1% relative precision. Inputs: * d: positive integer....

2 years ago

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The Birthday Phenomenon

First off, leap years are not being considered for this. In fact the year that people are born shouldn't be taken into considera...

2 years ago

Solved

Throwing Dice - Will You Be Eaten By The Dragon?

You and a dragon have agreed to let dice rolls determine whether it eats you or not. The dragon will roll a single die, of x ...

2 years ago

Solved

Chess probability

The difference in the ratings between two players serves as a predictor of the outcome of a match (the <http://en.wikipedia.org/...

2 years ago

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Calculate Amount of Cake Frosting

Given two input variables r and h, which stand for the radius and height of a cake, calculate the surface area of the cake you n...

2 years ago

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Solve a System of Linear Equations

Example: If a system of linear equations in x₁ and x₂ is: 2x₁ + x₂ = 2 x₁ - 4 x₂ = 3 Then the coefficient matrix (A) is: 2 ...

2 years ago

Solved

Find the maximum number of decimal places in a set of numbers

Given a vector or matrix of values, calculate the maximum number of decimal places within the input. Trailing zeros do not coun...

2 years ago

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Make roundn function

Make roundn function using round. x=0.55555 y=function(x,1) y=1 y=function(x,2) y=0.6 y=function(x,3) ...

2 years ago

Solved

Rounding off numbers to n decimals

Inspired by a mistake in one of the problems I created, I created this problem where you have to round off a floating point numb...

2 years ago