473,699 Members | 2,474 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

newtons method

2 New Member
hi everyone can u pls help me to explain newtons method to find suare of a number and pls post its program also
Oct 19 '06 #1
1 6511
85 New Member
hi everyone can u pls help me to explain newtons method to find suare of a number and pls post its program also
If you mean the square root of a number you simply apply the newton method to the function f(x)=x*x-a, where a is the number whose square root will be computed

The following implementation is basic but should do the trick

#include <stdlib.h>
#include <math.h>

#define f(x) (x*x-2)//The function
#define d(x) (2*x)//Its derivative
//The square root of the number in the above number is computed here

//This program computes an approximation to the root of the
//function defined above via Newton's Method

using namespace std;

int main(int argc, char *argv[])
int istep;//loop control
double dl = 1e-14;//lower bound
double a, b, x0,dx;//variables
double x,xnew;//variables

a = 1; b =10;//This defines the range on which the root is saught
dx = b-a;
x0 = (a+b)/2;//This defines an initial approximation to the root
istep = 0;

//Newton's Method Algorithm
while (fabs(dx) > dl)
dx = f(x0)/d(x0);
x0 -= dx;

cout<<"The Square Root Algorithm"<<end l;
cout<<" "<<endl;
cout<<"Newton's method converged in "<<istep<<" steps"<<endl;
cout<<" "<<endl;
cout<<"The square root is "<<endl;
cout<<" "<<endl;
printf("%16.24l f\n",x0);//For outoputting more digits of precision
cout<<" "<<endl;

system("PAUSE") ;
return 0;
Oct 19 '06 #2

Sign in to post your reply or Sign up for a free account.

Similar topics

by: Dave Rahardja | last post by:
OK, so I've gotten into a philosophical disagreement with my colleague at work. He is a proponent of the Template Method pattern, i.e.: class foo { public: void bar() { do_bar(); } protected: virtual void do_bar() {} };
by: Chris | last post by:
Hi I have a scenario where I've created another AppDomain to dynamically load a DLL(s) into. In this newly loaded DLL I want to call a static method on a class. The problem arise is that I have the same class/static method definition statictly linked to my EXE and when I call InvokeMember(...), even though I got the Type from the new AppDomain, it calls the static method that I am staticly linked to and not the static method in the dynamicly...
by: daniel.w.gelder | last post by:
I wrote a template class that takes a function prototype and lets you store and call a C-level function, like this: inline string SampleFunction(int, bool) {..} functor<string (int, bool)> myFunctor = SampleFunction; string result = myFunctor(7, true); Works great thanks to the help from this group. Here's the guts so far for two-arity:
by: greenflame | last post by:
I am trying to make a matrix object. I have given it some properites. I am trying to add a method. When I call the method by Test.showDims(...) I want to only enter one input, that is the method by which to do it. As you can see from the object definition that it corresponds to a function that takes two inputs. When I try to run the script it does nothing. So what is wrong and how do I fix it? Here is the script. function...
by: Nick Flandry | last post by:
I'm running into an Invalid Cast Exception on an ASP.NET application that runs fine in my development environment (Win2K server running IIS 5) and a test environment (also Win2K server running IIS 5), but fails on IIS 6 running on a Win2003 server. The web uses Pages derived from a custom class I wrote (which itself derives from Page) to provide some common functionality. The Page_Load handler the failing webpage starts out like this: ...
by: JohnR | last post by:
From reading the documentation, this should be a relatively easy thing. I have an arraylist of custom class instances which I want to search with an"indexof" where I'm passing an instance if the class where only the "searched" property has a value. I expected to get the index into the arraylist where I could then get the entire class instance. However, the 'indexof' is never calling my overloaded, overrides Equals method. Here is the...
by: Mihai Osian | last post by:
Hi everyone, Given the code below, can anyone tell me: a) Is this normal behaviour ? b) If it is, what is the reason behind it ? I would expect the A::method(int) to be inherited by B. Compiler: gcc 4.1, Linux Thanks,
by: Steve Richter | last post by:
in a generic class, can I code the class so that I can call a static method of the generic class T? In the ConvertFrom method of the generic TypeConvert class I want to write, I have a call to the static Parse method of the conversion class. if (InValue is string) return T.Parse((string)InValue); else return base.ConvertFrom(context, culture, InValue);
by: allendowney | last post by:
Hi All. In a complex inheritance hierarchy, it is sometimes difficult to find where a method is defined. I thought it might be possible to get this info from the method object itself, but it looks like maybe not. Here is the test case I tried: class A(object):
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.