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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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...

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

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Get me!
Inspired by Now! problems. Do your best!

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

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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...

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String Logic 3
Example: 'CAT' --> 'RPI' 'DOG' --> 'SDV' 'MATLAB' --> 'BPIAPQ' 'ROSY' --> 'GDHN' 'TRUST' --> 'IGJHI' 'MOSTLY' --> 'BDHI...

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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.

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Solve a ballot counting problem

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NaN

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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)...

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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...

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

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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 ...

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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.

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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.

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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...

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Create initial basic feasible solution for transportation problems -Minimum Cost Method

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Create initial basic feasible solution for transportation problems - North-West Corner Method

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

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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...

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Make a Plot with Functions
Make a plot and test

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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....

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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...

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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 ...

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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/...

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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...

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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 ...

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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...

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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) ...

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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...

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