Input error?

Here is my code, my function code, what I type into the command window and what the error says. Please help!

My code:

   function Xout=SecantRoot(Fun,Xa,Xb,Err,imax)

   %This function will find the root of a function (Fun(X)) using the secant method.

   %Fun is a function to be determined by the user

   %Xa and Xb are your two initial guesses needed for secant method

   %Err is the maximum interval of error

   %imax is the maximum number of iterations

    for i = 1:imax

      Xi=Xb-((Fun(Xb)*(Xa-Xb))/(Fun(Xa)-Fun(Xb)));
      if abs((Xi-Xb)/Xb)<Err
          Xout=Xi;
          break
      end
      Xa=Xb;
      Xb=Xi;
  end
  if i ==imax
      fprintf('Solution not found.');
      Xout=('No answer');
  end

My Function code:

function y=Fun(x)
y=7*(x.^3) + exp^.2*x -6*x -10;

What I put into command window

>> SecantRoot (@Fun,2.5,.7,.1,7)

What matlab tells me:

>> SecantRoot (@Fun,2.5,.7,.1,7)
Error using exp
Not enough input arguments.

Error in Fun (line 2)
y=7*(x.^3) + exp^.2*x -6*x -10;

Error in SecantRoot (line 4)
    Xi=Xb-((Fun(Xb)*(Xa-Xb))/(Fun(Xa)-Fun(Xb)));

How do I fix these issues?

Answer 1

[Walter Roberson]

Change your

exp^.2*x

to

exp(2*x)

or

exp(2)*x

depending on your intention.