Homework Answers
1) (d) bisection divides the interval into half by calculating
mid point and evaluating function values on it. hence:
mid-point = -0.75
function value = (-0.75)^3-(-0.75)-11 = -10.6719
2) (d) open methods use gradients to approximate the next guess
3) (c) Newton raphson requires the knowledge of exact derivative
4) (c) As both the methods choose initial bracketing points having opposite sign of function value. Neither bisection or false position can determine the root
5) (c) Newton raphson method can diverge
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clearvars close all clc tol = 0.0001; % this is the tolerance for root identification xold...
clearvars
close all
clc
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xold = 0.5; % this is the initial guess
test = 1; % this simply ensures we have a test value to enter the loop below.
%If we don't preallocate this, MATLAB will error when it trys to start the
%while loop below
k = 1; %this is the iteration counter. Similar to "test" we need to preallocate it
%to allow the while loop to...
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Please MATLAB for all coding with good commenting.
(20) Consider the function f(x) = e* - 3x. Using only and exactly the four points on the graph off with x-coordinates -1,0, 1 and 2, use MATLAB's polyfit function to determine a 3' degree polynomial that approximates f on the interval (-1, 2]. Plot the function f(x) and the 360 degree polynomial you have determined on the same set of axes. f must be blue and have a dashed line style,...
45-3. Modify the code used in Example 4 to find the root only at f(x)<0.01 using Newton-Rephson Method without showing any iteration. Also find the root of equation, f(x) = x 9-3x -10, take initial guess, Xo=2 العقدة College of 9:05 mybb.qu.edu.ca Numerical Methods (Lab.) GENG 300 Summer 2020 5.1.2 Open Methods - Newton-Raphson Method f(x) *1+1 = x; - Matlab Code Example:4 function mynewtraph.t1.x0,-) XXO for ilin x - x - x)/1 x) disp 1 x) <0.01 break end...
clearvars
close all
clc
tol = 0.0001; % this is the tolerance for root identification
xold = 0.5; % this is the initial guess
test = 1; % this simply ensures we have a test value to enter the loop below.
%If we don't preallocate this, MATLAB will error when it trys to start the
%while loop below
k = 1; %this is the iteration counter. Similar to "test" we need to preallocate it
%to allow the while loop to...
1. This question concerns finding the roots of the scalar non-linear function f(x) = r2-1-sinx (1 mark) (b) Apply two iterations of the bisection method to f(x) 0 to find the positive root. (3 marks) (c) Apply two iterations of the Newton-Raphson method to find the positive root. Choose (3 marks) (d) Use the Newton-Raphson method and Matlab to find the positive root to 15 significant (3 marks) (a) Use Matlab to obtain a graph of the function that shows...
Newton-Raphson scheme
?
Calculus Suppose you want to find zeros of the function f(x)102212 and plan to use the Newton-Raphson scheme. (a) Write down the Newton-Raphson algorithm for this. That is, write down explicitly a formula for computing your (n+1)st guess Tn+1 given your nth guess rn for a root. In other words, deter- mine the recurrence relation resulting from using this particular function f. (b) Modifying Algorithm 2.2 as required, find the values through x7 if you choose an...
5.1.2 Open Methods - Newton-Raphson Method Xi+1= xi – FOTO Matlab Code Example:4 function mynewtraph (f, f1,x0,n) Xx0; for ilin x = x - f(x)/f1(x); disp (li if f(x) <0.01 f(x))) break end end end Matlab Code from Chapra function [root, ea, iter)=newtraph (func,dfunc, xr, es,maxit,varargin) newtraph: Newton-Raphson root location zeroes 8 [root, ea, iter)-newtraph (func, dfunc, xr, es,maxit,pl,p2, ...): $uses Newton-Raphson method to find the root of fune input: func- name of function 8dfunc = name of derivative of...
4) (16 points) The function f(x)= x? – 2x² - 4x+8 has a double root at x = 2. Use a) the standard Newton-Raphson, b) the modified Newton-Raphson to solve for the root at x = 2. Compare the rate of convergence using an initial guess of Xo = 1,2. 5) (14 points) Determine the roots of the following simultaneous nonlinear equations using a) fixed-point iteration and b) the Newton-Raphson method: y=-x? +x+0,75 y + 5xy = r? Employ initial...
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