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ML-Class Ex 7 – kMeans clustering

December 24, 2011
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ML-Class Ex 7 – kMeans clustering

The K-means algorithm is a method to automatically cluster similar data examples together.The intuition behind K-means is an iterative procedure that starts by guessing the initial centroids, and then refines this guess by repeatedly assigning examples to their closest centroids and then recomputing the centroids based on the assignments.Read more »

project euler – problem 49

November 8, 2011
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The arithmetic sequence, 1487, 4817, 8147, in which each of the terms increases by 3330, is unusual in two ways: (i) each of the three terms are prime, and, (ii) each of the 4-digit numbers are permutations of one another.There are no arithmetic sequences made up of three 1-, 2-, or 3-digit primes,...

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project euler – problem 47

November 8, 2011
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The first two consecutive numbers to have two distinct prime factors are:14 = 2 × 7Read More: 278 Words Totally

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project euler – Problem 44

November 8, 2011
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Pentagonal numbers are generated by the formula, Pn=n(3n−1)/2. The first ten pentagonal numbers are:1, 5, 12, 22, 35, 51, 70, 92, 117, 145, ...Read More: 472 Words Totally

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project euler – Problem 32

November 8, 2011
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We shall say that an n-digit number is pandigital if it makes use of all the digits 1 to n exactly once; for example, the 5-digit number, 15234, is 1 through 5 pandigital.The product 7254 is unusual, as the identity, 39 × 186 = 7254, containing multiplicand, multiplier, and product is 1 through...

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project euler – Problem 31

November 8, 2011
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In England the currency is made up of pound, £, and pence, p, and there are eight coins in general circulation:1p, 2p, 5p, 10p, 20p, 50p, £1 (100p) and £2 (200p).Read More: 299 Words Totally

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project euler – Problem 15

November 8, 2011
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project euler – Problem 15

Starting in the top left corner of a 2x2 grid, there are 6 routes (without backtracking) to the bottom right corner.How many routes are there through a 20x20 grid?Read More: 293 Words Totally

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project euler-Problem 43

November 7, 2011
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The number, 1406357289, is a 0 to 9 pandigital number because it is made up of each of the digits 0 to 9 in some order, but it also has a rather interesting sub-string divisibility property.Let d1 be the 1st digit, d2 be the 2nd digit, and so on. In this way, we note the...

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project euler-Problem 41

November 7, 2011
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We shall say that an n-digit number is pandigital if it makes use of all the digits 1 to n exactly once. For example, 2143 is a 4-digit pandigital and is also prime.What is the largest n-digit pandigital prime that exists?Read More: 288 Words Totally

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Project Euler-Problem 38

November 1, 2011
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Take the number 192 and multiply it by each of 1, 2, and 3:192 × 1 = 192Read More: 450 Words Totally

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