#*****************************************************************************80
#
## newton_test tests newton.
#
#  Licensing:
#
#    Copyright 2016 James P. Howard, II
#
#    The computer code and data files on this web page are distributed under
#    https://opensource.org/licenses/BSD-2-Clause, the BSD-2-Clause license.
#
#  Modified:
#
#    13 March 2020
#
#  Author:
#
#    John Burkardt
#
cat ( date ( ), "\n" )
cat ( "\n" )
cat ( "newton_test\n" )
cat ( " ", version$version.string, "\n" )
cat ( "  newton seeks the root of an equation using the newton method.\n" )
cat ( "\n" )

source ( "/home/burkardt/public_html/r_src/newton/newton.R" )  

f <- function ( x ) { x^2 - 1.0 }
fp <- function ( x ) {2*x}
x <- 1.25
value <- newton ( f, fp, x, tol = 1.0e-3 )
cat ( "  newton(x^2-1, 2*x, x, 1.0-3) = ", value, "\n" )
#
#  Terminate.
#
cat ( "\n" )
cat ( "newton_test\n" )
cat ( "  Normal end of execution.\n" )
cat ( date ( ), "\n" )

quit ( )