MATLAB: Error: “Difference order N must be a positive integer scalar” when called symbolic gradient function

gradient

 In my program, I first use command jacobian generate a symbolic gradient of my objective function.Then I call the function(gradient.m) and feed it with numeric value. But Matlab warned me like
Warning: Function "diff" is not verified to be a valid MATLAB
  function. 
  Warning: Function "diff" is not verified to be a valid
  MATLAB function. 
  Warning: Function "diff" is not verified to be a valid
  MATLAB function. 
  Error using diff
  Difference order N must be a positive integer scalar.
    Error in gradient (line 10)
    t4 = diff(t2,B1);
    Error in mini_dist_noheter (line 60)
    dfb = gradient(b(1),b(2),b(3));
The gradient function file, main file and data see the attachment.

Best Answer

You appear to have a problem with your MATLAB path. I suggest using
resetdefaultpath
and seeing if that helps.
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