Secant

Write a Matlab function secant:m which

[Matt Tearle]

which...?

I'm going to take a guess that you've been asked to write a function that implements the secant method for finding roots. So what have you done so far (ie please post your code, as appropriate), and what MATLAB-specific issues are you having?

[Jan]

I'm not able to see the entire question. I see: "Write a Matlab function secant:m which". To be exact: This is not even a question at all.

Answer 1

[Sean de Wolski]

secant = @(x)1./cos(x);

[Andrew Newell]

How about secant = @(x) sec(x)?

[Ashley Dunn]

Hey guys r u able to see the entire question? It's not the secant=cos^-1

It's the secant function which is a complicated equation....

[John D'Errico]

Homework is for YOU to do, for YOU to learn from. We already know how to do it. (And it is not THAT complex of a problem.) So sit down, and make an effort.

Answer 2

[Steve Areola]

clc

p0 = 0; p1 = 1; tol = 10^-6; N=12;

i = 2;

f = @(x) %write function;

q0 = f(p0); q1 = f(p1);

while i<=N

p = p1- (q1*(p1-p0))/(q1-q0);

if abs(p-p1)<tol

return

end

i = i+1

p0 = p1

p1 = p

q0 = q1

q1 = f(p)

end