spot7.org logo
Home PHP C# C++ Android Java Javascript Python IOS SQL HTML Categories

Complexity of this prime number search algorithm


Check for Pi(n) function. It's approximation is n/ln(n).
Overall algorithm (a kind of Sieve of Eratosthenes implementation) complexity is evaluated as O(n(loglog(n))


Categories : Algorithm

Related to : Complexity of this prime number search algorithm
Complexity of a basic algorithm?
When determining complexities, we don't include constants or coefficients. Instead of O(2N + 2), it should be O(n). We only care about numbers if they're exponential, i.e. 2^n or n^2, log2(n), etc. Putting that aside, are you sure this is O(n)? O(n) would mean that it runs n times, but it looks like j is going to catch up to n before n times. See what I'm saying? EDIT: Ok, here's what's going o

Categories : Java
What is the time complexity for AngularJS's dirty checking algorithm?
The dirty checking happens in the $diggest cycle, so we need to study the complexity of the $diggest cycle. The $diggest cycle is the stage in which Angular ensures the changes of the model have settled, so that it can render the view with the updated changes. In order to do that, Angular starts a loop in which each iteration evaluates all the template expressions of the view, as well as the $wat

Categories : Angularjs
Prime Number Theorem Python
My suggestion of how to do this (in relation to your current code) is as follows: previous = 2 n = 0 for i in range(3,10000000): if Is_Prime(i): n = n+1 current = i gn = current - previous previous = i if n % 1000 == 0: print "Now at the gap between prime",n,"and prime",n+1 average_gap = (i-2)/float(n); # (n+1)st pri

Categories : Python
Use 2 Threads to calculate the nth prime number in Python
This is the answer I have currently, import threading, doctest, cProfile, time, random result = [2] counter = 1 def get_int(num): for i in range(3, num): yield i def is_prime(num): for j in range(2,int(num)): if (num % j) == 0: return False result.append(num) return True def prime_calculator(nth): lock = threading.Lock() global result, count

Categories : Python
How to determine if a number is a prime in a faster fashion using additional threads?
I'm going to ignore whether you've got the most efficient approach and focus on how your current code could be faster with more threads. You currently iterate through all the numbers from 2 -> x and perform a simple test. A way to improve performance might be to split this task into Z chunks and start Z threads to perform the tests in parallel. E.g. if you had two threads, you would have one

Categories : Java
Recently Add
Proving optimality for a new algorithm that finds minimum spanning tree
why this assembly piece of code do jmp forever
Find out if segment is fully inside of polygon
Algorithm for coloring a hexagon tile map with minimum distance (3) for reoccurring colors
Sort pairs to be more consecutive
To find three unique numbers whose number of occurrence is even
Dealing with duplication between unit and integration tests
reflection and symmetry in back tracking queens
Big O analysis for method with multiple parameters
Divide Huge Array of Numbers in Buckets
Algorithm to find adjacent cells in a matrix
Why this code gives WA for Petersen Graph(codechef)?
Complexity of this prime number search algorithm
How to detect if a file has changed?
Given string x,y and z. Determine if z is a shuffle
Basic decryption for simple encryption algorithm
An efficient way to assign user_ids to huge dataset under certain conditions
What's a more efficient implementation of this puzzle?
Generating prime numbers in poly-time
What if I do not use G transpose in calculating Strongly Connected Components?
Dividing an array into optimum no of equal sum sublists
Counting derangements
How to iterate through all cases when partitioning objects
Algorithm: How to find closest element, having coordinates and dimension
Developing player rankings with ELO
How to transform two set of discrete points ( vectors ) to help plotting them on a common scale
Heap Sort Space Complexity
complex root finding algorithm
Every possible combination algorithm
RSA Cryptosystem - Retrieve m
© Copyright 2017 spot7.org Publishing Limited. All rights reserved.