Sat Mar 14 10:13:29 2020 

secant_test
  R version 3.4.4 (2018-03-15) 
  secant seeks the root of an equation using the secant method.

  secant(x^2-1, x, 1.0-3) =  1 

secant_test
  Normal end of execution.
Sat Mar 14 10:13:29 2020