$\begingroup$So i am a completely new at Matlab. I'm basically suppose to develop a function in Matlab that finds the zeros of a cubic polynomial. real and complex. I'm pasting below what I have so far.
I started off by using the bisection method and it's not working for a basic polynomial i know the roots to.
function rts = cubicxx(C) a = C(1); b = C(2); c = C(3); d = C(4); start = 1e20; last = -1e20; rts = [8000 ; 8000; 8000]; rcount = 0; f = @(x) (a).*x^3 + (b).*x^2 + (c).*x + d ; %for loop % x(i)= % i = i+1; %end %for rts='a' : 'c', rts, maybe something i will use later tol = 10^(-6) while (rcount < 4) %while true Starting off with the Bisection method. p = (start + last)/2; if f(p) == 0 rcount = rcount + 1; rts (rcount) = p; break; end if p-start <tol break; end if f(start)*f(p)> 0 start = p; else last = p; end end end the "rcount" is suppose to help me print the roots. Anyone's help would be greatly appreciated.
$\endgroup$9 Reset to default
