>>
>> testroot1
*** root1 =     4.41
*** root2 =     1.59

Notice that Matlab automatically documents the purpose of each m-file. You can query the purpose of the m-file by simply typing:

>>
>> help bisection
  BISECTION: root = bisection(func,xl,xu,es,maxit,verbose):
    uses bisection method to find the root of a function
  input:
    func   = name of function 
    xl, xu = lower and upper guesses
    es     = (optional) stopping criterion (%)
    maxit  = (optional) maximum allowable iterations
    verbose = (optional) flag for verbose output
  output:
    root = real root

>>
>> help myfunc3
  MYFUNC3: Compute f(x) = (x - 3)^3 - 2
>>