optimization - MATLAB script gives me NaN even for setting variables to integers -

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After running this script everything is set to NaN and nothing happens. I'm just trying to do a second method on a 2-D function where a variable is set to 0. 

  hi = @ (x, y) exp (-3 * ((x + 0.5). ^ 2 + 2 * y ^ 2)) + exp (-x ^ 2 - 2 * y ^ 2). * Cos (4 * x) - 1e-3; Tol = 1e-10; Yi = 0; X0 = -2; X1 = 2; F0 = hi (x0, yi); F1 = hi (x1, yi); For Jj = 1:24 x2 = x1 - f1 * (x1-x0) / (F1-F0); F2 = hi (x2, yi); If (stomach (x2-x1) & lt; tol) root = x2; Break x0 = x1; X1 = x2; F0 = F1; F1 = F2; End of End    
 
 
 Here are two problems: I have been in the first line:  
  x2 = x1 - f1 * (x1-x0) / (f1-f0);   
 The function decreases when  x2  with  f1-f0  with every code will cause the forum to blow it up Can  abs (f1-f0) & lt; By adding  tol  with   x2 = x1 - f1 * (x1-x0) / (f1-f0 + tol) or  tol ;   
 However, this will not find the route you want. Your function reveals the graphing problem:  
 Enter image details here  
 You start the search on  x0 = -2  and  x1 = + 2 , which are two values ​​that force three roots, but search  x2 = -10.5203 ​​, and will continue to try and search for root located on infinity. If you choose the best values, you can use the original code to find all the three basic values. For example:  
  x0 x1 root ------ ------ ------ -1.0 +1.0 1.9522 -0.5 +0.5 0.4164 +0.6 +1.0 1.178 9   
 When searching (or decreasing / maximizing) roots, the starting point of search often makes a difference. It is best to double check your starting points and learn more about the work you are working with.

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