# include <math.h>
# include <stdio.h>
# include <stdlib.h>

# include "asa066.h"

/******************************************************************************/

void normal_01_cdf_values ( int *n_data, double *x, double *fx )

/******************************************************************************/
/*
  Purpose:

    normal_01_cdf_values() returns some values of the Normal 01 CDF.

  Discussion:

    In Mathematica, the function can be evaluated by:

      Needs["Statistics`ContinuousDistributions`"]
      dist = NormalDistribution [ 0, 1 ]
      CDF [ dist, x ]

  Licensing:

    This code is distributed under the MIT license. 

  Modified:

    28 August 2004

  Author:

    John Burkardt

  Reference:

    Milton Abramowitz, Irene Stegun,
    Handbook of Mathematical Functions,
    National Bureau of Standards, 1964,
    ISBN: 0-486-61272-4,
    LC: QA47.A34.

    Stephen Wolfram,
    The Mathematica Book,
    Fourth Edition,
    Cambridge University Press, 1999,
    ISBN: 0-521-64314-7,
    LC: QA76.95.W65.

  Parameters:

    Input/output, int *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, double *X, the argument of the function.

    Output, double *FX, the value of the function.
*/
{
# define N_MAX 17

  static double fx_vec[N_MAX] = { 
     0.5000000000000000E+00,  
     0.5398278372770290E+00,  
     0.5792597094391030E+00,  
     0.6179114221889526E+00,  
     0.6554217416103242E+00,  
     0.6914624612740131E+00,  
     0.7257468822499270E+00,  
     0.7580363477769270E+00,  
     0.7881446014166033E+00,  
     0.8159398746532405E+00,  
     0.8413447460685429E+00,  
     0.9331927987311419E+00,  
     0.9772498680518208E+00,  
     0.9937903346742239E+00,  
     0.9986501019683699E+00,  
     0.9997673709209645E+00,  
     0.9999683287581669E+00 };

  static double x_vec[N_MAX] = { 
     0.0000000000000000E+00,    
     0.1000000000000000E+00,  
     0.2000000000000000E+00,  
     0.3000000000000000E+00,  
     0.4000000000000000E+00,  
     0.5000000000000000E+00,  
     0.6000000000000000E+00,  
     0.7000000000000000E+00,  
     0.8000000000000000E+00,  
     0.9000000000000000E+00,  
     0.1000000000000000E+01,  
     0.1500000000000000E+01,  
     0.2000000000000000E+01,  
     0.2500000000000000E+01,  
     0.3000000000000000E+01,  
     0.3500000000000000E+01,  
     0.4000000000000000E+01 };

  if ( *n_data < 0 )
  {
    *n_data = 0;
  }

  *n_data = *n_data + 1;

  if ( N_MAX < *n_data )
  {
    *n_data = 0;
    *x = 0.0;
    *fx = 0.0;
  }
  else
  {
    *x = x_vec[*n_data-1];
    *fx = fx_vec[*n_data-1];
  }

  return;
# undef N_MAX
}