#! /usr/bin/env python
#
def laplace_cdf_values ( n_data ):

#*****************************************************************************80
#
## LAPLACE_CDF_VALUES returns some values of the Laplace CDF.
#
#  Discussion:
#
#    In Mathematica, the function can be evaluated by:
#
#      Needs["Statistics`ContinuousDistributions`"]
#      dist = LaplaceDistribution [ mu, beta ]
#      CDF [ dist, x ]
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    17 February 2015
#
#  Author:
#
#    John Burkardt
#
#  Reference:
#
#    Milton Abramowitz and Irene Stegun,
#    Handbook of Mathematical Functions,
#    US Department of Commerce, 1964.
#
#    Stephen Wolfram,
#    The Mathematica Book,
#    Fourth Edition,
#    Wolfram Media / Cambridge University Press, 1999.
#
#  Parameters:
#
#    Input/output, integer N_DATA.  The user sets N_DATA to 0 before the
#    first call.  On each call, the routine increments N_DATA by 1, and
#    returns the corresponding data; when there is no more data, the
#    output value of N_DATA will be 0 again.
#
#    Output, real MU, the mean of the distribution.
#
#    Output, real BETA, the shape parameter.
#
#    Output, real X, the argument of the function.
#
#    Output, real F, the value of the function.
#
  import numpy as np

  n_max = 12

  beta_vec = np.array ( ( \
     0.1000000000000000E+01, \
     0.1000000000000000E+01, \
     0.1000000000000000E+01, \
     0.1000000000000000E+01, \
     0.2000000000000000E+01, \
     0.3000000000000000E+01, \
     0.4000000000000000E+01, \
     0.5000000000000000E+01, \
     0.2000000000000000E+01, \
     0.2000000000000000E+01, \
     0.2000000000000000E+01, \
     0.2000000000000000E+01 ))

  f_vec = np.array ( ( \
     0.5000000000000000E+00, \
     0.8160602794142788E+00, \
     0.9323323583816937E+00, \
     0.9751064658160680E+00, \
     0.6967346701436833E+00, \
     0.6417343447131054E+00, \
     0.6105996084642976E+00, \
     0.5906346234610091E+00, \
     0.5000000000000000E+00, \
     0.3032653298563167E+00, \
     0.1839397205857212E+00, \
     0.1115650800742149E+00 ))

  mu_vec = np.array ( ( \
     0.0000000000000000E+01, \
     0.0000000000000000E+01, \
     0.0000000000000000E+01, \
     0.0000000000000000E+01, \
     0.0000000000000000E+01, \
     0.0000000000000000E+01, \
     0.0000000000000000E+01, \
     0.0000000000000000E+01, \
     0.1000000000000000E+01, \
     0.2000000000000000E+01, \
     0.3000000000000000E+01, \
     0.4000000000000000E+01 ))

  x_vec = np.array ( ( \
     0.0000000000000000E+01, \
     0.1000000000000000E+01, \
     0.2000000000000000E+01, \
     0.3000000000000000E+01, \
     0.1000000000000000E+01, \
     0.1000000000000000E+01, \
     0.1000000000000000E+01, \
     0.1000000000000000E+01, \
     0.1000000000000000E+01, \
     0.1000000000000000E+01, \
     0.1000000000000000E+01, \
     0.1000000000000000E+01 ))

  if ( n_data < 0 ):
    n_data = 0

  if ( n_max <= n_data ):
    n_data = 0
    mu = 0.0
    beta = 0.0
    x = 0.0
    f = 0.0
  else:
    mu = mu_vec[n_data]
    beta = beta_vec[n_data]
    x = x_vec[n_data]
    f = f_vec[n_data]
    n_data = n_data + 1

  return n_data, mu, beta, x, f

def laplace_cdf_values_test ( ):

#*****************************************************************************80
#
## LAPLACE_CDF_VALUES_TEST demonstrates the use of LAPLACE_CDF_VALUES.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    17 February 2015
#
#  Author:
#
#    John Burkardt
#
  import platform

  print ( '' )
  print ( 'LAPLACE_CDF_VALUES_TEST:' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  LAPLACE_CDF_VALUES stores values of the LAPLACE CDF.' )
  print ( '' )
  print ( '        Mu            Beta         X            F(Mu,Beta,X)' )
  print ( '' )

  n_data = 0

  while ( True ):

    n_data, mu, beta, x, f = laplace_cdf_values ( n_data )

    if ( n_data == 0 ):
      break

    print ( '  %12f  %12f  %12f  %24.16g' % ( mu, beta, x, f ) )
#
#  Terminate.
#
  print ( '' )
  print ( 'LAPLACE_CDF_VALUES_TEST:' )
  print ( '  Normal end of execution.' )
  return

if ( __name__ == '__main__' ):
  from timestamp import timestamp
  timestamp ( )
  laplace_cdf_values_test ( )
  timestamp ( )