Input argument

function y = f1(x)
% A univariate function with a simple zero
 syms x
y = cos(x) - x;
r = fzero('f1', 0.5)

It gives the following error

Error in ==> oct3 at 5 r = fzero('f1', 0.5) >>

Answer 1

[bym]

try

r = fzero(@f1,.5)

Answer 2

[Walter Roberson]

Why is the error in the file oct3 when all you show us is the file f1 ?

What is the error message you are getting?

[fatma]

??? Input argument "x" is undefined.

Error in ==> oct3 at 4

y = cos(x) - x;

This error allows happen in similar programs considering "x" is undefined