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

Question

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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.

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John D'Errico 2014-4-12

I do wonder why anyone would use a form like

exp(1).^(-0.2*x)

instead of the mathematically identical

exp(-0.2*x)

Answer 1

Alberto 2014-4-11

编辑：Alberto 2014-4-11

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Answer 2

Walter Roberson 2014-4-11

0 个投票

The lines starting from "fun=" should be in a different file, or entered in the command line, and you would run that rather than running f directly.