Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    So far, numerical methods is fine, just one question, about the secant/false position methods.

    I find these two methods some what equilant to each other, but after doing things like fixed point iteration, to create a table of values for the converging values after each iteration to the roots of a particular polynomial, I find the false position and secant method aomewhat harder.

    Harder as in, in the fixed point iteration method, I just use my ANS button in my calculator after each iteration, to use the previous answer as part of x, to create a table of the converging roots.
    But when doing the false position method, the previous values of two points have to be b and a have to be entered into the formula:

    af(b)-bf(a) / f(b)-f(a)

    where f(b) and f(a) are the y-values of the function when x=a and x=b
    this will give values x(1), x(2), x(3) etc...
    which converge to the root of f(x)

    But after about 3 or so iterations, I have very long numbers, and I can't use the ANS key in my calculator anymore because theres two values a and b which have to be noted from previous iteration, and also to do another iteration, I have to work out f(a) and f(b) etc..

    I find this method so tedious, to enter values such as a=1,.37474393,
    b=2.48485484 etc, to find the root inbetween a and b.
    Has anybody actually got a practical method of doing the false position method, with simplicity, it just becomes to tedious and time-wasting. :rolleyes:
 
 
 
Turn on thread page Beta
Updated: July 1, 2005

1,122

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should predicted grades be removed from the uni application process
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.