I am trying to find the positive roots of the equaiton y = ((exp(1).^​(-0.2*x)))​*(cos(2*x)​)-(0.15*x.​^2)+1, but I keep getting the error message saying that there arent enough input arguments. I dont know what to do.

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Rebecca
Rebecca on 11 Apr 2014
Commented: John D'Errico on 12 Apr 2014
This is what I enter in my Editor window verbatim:
function y = f(x)
y = ((exp(1).^(-0.2*x)))*(cos(2*x))-(0.15*x.^2)+1;
fun=@f; % function
x0= [3,4]; % initial interval
x= fzero(fun,x0);
This is what I receive in the Command window after I run the function:
>> f Error using f (line 2) Not enough input arguments.
  1 Comment
John D'Errico
John D'Errico on 12 Apr 2014
I do wonder why anyone would use a form like
exp(1).^(-0.2*x)
instead of the mathematically identical
exp(-0.2*x)

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