Hi, I am having a hard time finding the root to a polynomial function using the bisection method

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Nasser Yari
Nasser Yari 2016-2-7
评论： Walter Roberson 2020-12-15
Hi,
I am having a hard time finding the root to a polynomial function using the bisection method with the precision of 0.001. This is not a homework question. I am new at this and just trying to learn. This is what I have, but I have errors. I do appreciate any help or advice.
function root[x_lower,x_upper] 3*x.^3-10;
x_lower=-5;
x_upper=5;
x_mid= (x_lower* X_upper)/2;
while abs (f(x_mid))>0.001
if (f(x_mid)*f(x_upper))<0
x_lower=x_mid
else
x_upper=x_mid
end
x_mid=(x_lower+x_upper)/2;
end
fprintf('the root is %g\n', x_mid)
  2 个评论
Walter Roberson
Walter Roberson 2020-12-15
The fprintf() in that form displays to the command window the text
the root is
followed on the same line by the value of the variable x_mid, with the value represented in direct decimal notation if its absolute value is in the range 0.0001 to 999999, and otherwise representing it in scientific notation. After that, newline is output to move on to the next line

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Walter Roberson
Walter Roberson 2016-2-7
Change
function root[x_lower,x_upper] 3*x.^3-10;
to
function root(x_lower,x_upper)
f = @(x) 3*x.^3-10;
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