factorial

Factorial of 170+

由 你离开我真会死。 提交于 2019-12-07 02:27:23
问题 everytime I try to get the factorial of 171, I get INF. 170 works fine. Is it possible to get the factorial of 171+ in a script? How? My function: function factorial($n) { if ($n == 0) return 1; return $n * factorial($n - 1); } 回答1: You'll have to use BC Math or GNU MP extension. PHP doesn't provide any tools for high-values or high-precision operations OOTB. 回答2: If you deal with very large numbers, you'll need to use an extension that allows you to do that. There's BCMath ( http://www.php

Python: Calculate factorial of a non-integral number

由 时光怂恿深爱的人放手 提交于 2019-12-06 22:39:57
问题 I'm wondering if there's a speedy, Pythonic way to calculate factorials of non-integral numbers (e.g., 3.4)? Of course, the bult-in factorial() function in the Math module is available, but it only works for integrals (I don't care about negative numbers here). 回答1: You'd want to use math.gamma(x). The gamma function is an extension of the factorial function to real numbers. Note that the function is shifted by 1 when compared to the factorial function. So math.factorial(n) is math.gamma(n +

While importing auto_arima from pmdarima: ERROR : cannot import name 'factorial' from 'scipy.misc'

由 我的未来我决定 提交于 2019-12-06 21:33:49
问题 I have python 3.7.1 and scipy version : 1.3.0. I'm getting error while calling auto_arima saying : "cannot import name 'factorial' from 'scipy.misc'" Just this basic import causes the issue:- "from pmdarima.arima import auto_arima" I've tried reinstalling scipy, didn't work 回答1: The function factorial was moved from scipy.misc to scipy.special . The version in scipy.misc has been deprecated for a while, and it was removed in scipy 1.3.0. Something in pmdarima or one of its dependencies is

Variables Multiplication

由 久未见 提交于 2019-12-06 16:34:25
问题 I'm making a script which gives the factorial for a inserted number, but i'm having some problems with the multiplication. Note: the factorial for is given by: 9!=9*8*7*6*5*4*3*2*1 Here's my code: #!/bin/bash echo "Insert an Integer" read input if ! [[ "$input" =~ ^[0-9]+$ ]] ; then exec >&2; echo "Error: You didn't enter an integer"; exit 1 fi function factorial { while [ "$input" != 1 ]; do result=$(($result * $input)) input=$(($input-1)) done } factorial echo "The Factorial of " $input "is

When I calculate a large factorial, why do I get a negative number?

由 白昼怎懂夜的黑 提交于 2019-12-06 14:09:55
问题 So, simple procedure, calculate a factorial number. Code is as follows. int calcFactorial(int num) { int total = 1; if (num == 0) { return 0; } for (num; num > 0; num--) { total *= num; } return total; } Now, this works fine and dandy (There are certainly quicker and more elegant solutions, but this works for me) for most numbers. However when inputting larger numbers such as 250 it, to put it bluntly, craps out. Now, the first couple factorial "bits" for 250 are { 250, 62250, 15126750,

Factoralize a Number in JavaScript

由 吃可爱长大的小学妹 提交于 2019-12-06 11:26:20
I'm currently taking a course on Free Code Camp and it's asking me return a factorial for any given number. However, I'm kind of stuck on the question (please forgive me, math isn't my strong point, haha). Here's what it asks: If the integer is represented with the letter n, a factorial is the product of all positive integers less than or equal to n. Factorials are often represented with the shorthand notation n! For example: 5! = 1 * 2 * 3 * 4 * 5 = 120f And here's the starting code: function factorialize(num) { return num; } factorialize(5); I'm not looking for a direct answer to the

“Recursive on All Control Paths” error when implementing factorial function

由 浪子不回头ぞ 提交于 2019-12-06 04:13:11
问题 For class I have an assignment: Write a C++ program that will output the number of distinct ways in which you can pick k objects out of a set of n objects (both n and k should be positive integers). This number is given by the following formula: C(n, k) = n!/(k! * (n - k)!) Your program should use two value-returning functions. The first one should be called factorial and should return n! . The second function should be called combinations and should return n!/(k! * (n - k)!). Test your

C++ algorithm for N! orderings

由 谁说胖子不能爱 提交于 2019-12-06 02:12:08
问题 I have a list of N items and I am wondering how I can loop through the list to get every combination. There are no doubles, so I need to get all N! orderings. Extra memory is no problem, I'm trying to think of the simplest algorithm but I'm having trouble. 回答1: See std::next_permutation 回答2: Expanding on others' answers, here's an example of std::next_permutation adapted from cplusplus.com #include <iostream> #include <algorithm> using namespace std; void outputArray(int* array, int size) {

Quick way to find a factorial of a large number

由 南笙酒味 提交于 2019-12-05 22:30:21
This is my program, but for really large numbers like 100,000, it works very slowly, is there any option to optimize? import java.math.BigInteger; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); BigInteger sum = BigInteger.valueOf(1); for (BigInteger i = BigInteger.valueOf(n); i.compareTo(BigInteger.ZERO) > 0; i = i.subtract(BigInteger.ONE)) { sum = sum.multiply(i); } System.out.println(sum); } } Just to illustrate that it sometimes pays to manipulate the expression, I modified the standard

factorial method resulting in error

由 喜欢而已 提交于 2019-12-05 15:00:15
I'm trying to get the factorial value of number 66 , but my method resulting me an output 0 . But whenever I try to get the factorial of 5 , it is resulting me an output 120 . Could anyone please tell me why? public static int factorial(int n) { if (n == 1) return n; return n * factorial(n - 1); } Sure - factorials get very big, very fast. You're overflowing the bounds of int very quickly... and at some point you'll have multiplied by enough factors to get an overflow to 0, which will then keep the value at 0 forever. According to a quick Google search, 66 factorial is 5.44344939 × 10 92 -
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