laboratory 2 false-position

Gerfel Philip Gonzales BSECE 5

False-Position Method

1 SCINOTE CODE

2 SIMULATION

Find the root of + = with a approximation error of . and maximum number of

iteration of 100.

//Gerfel Philip C. Gonzales

//BSECE 5

//Laboratory 2

//False Position Method

function false_position()

f = input("Input the function to be evaluated:","string");

a = input("Input initial lower guess a:");

b = input ("Input initial upper guess b:");

ea = input("Input your desired approximation error:");

maxiter = input("Maximum no. of iterations:");

disp(['Lower Root Upper f(a) f(m) f(b)'])

iter = 0;

while 1==1;

iter = iter + 1;

x = a;

fa = evstr(f);

x = b;

fb = evstr(f);

m = (b*fa - a*fb)/(fa-fb);

x = m;

fm = evstr(f);

er = abs(fm);

printf('%8.4f %8.4f %8.4f %8.4f %8.4f %8.4f \n',a ,m ,b ,fa ,fm ,fb);

//evaluation

if ((fa0)) then break end;

if fa*fm == 0 then break end;

if (fa*fm > 0) a = m; end

if (fa*fm < 0) b = m; end

if (er

Gerfel Philip Gonzales BSECE 5

2.1 CHOOSING A GUESS ROOT OF 0 TO 1

2.2 CHOOSING A GUESS ROOT OF -5 TO 0