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BASIC Source File  |  1993-01-29  |  795b  |  19 lines
  1. '   +----------------------------------------------------------------------+
  2. '   |                                                                      |
  3. '   |        BASWIZ  Copyright (c) 1990-1993  Thomas G. Hanlin III         |
  4. '   |                                                                      |
  5. '   |                      The BASIC Wizard's Library                      |
  6. '   |                                                                      |
  7. '   +----------------------------------------------------------------------+
  8.  
  9.    DEFDBL A-Z
  10.  
  11. FUNCTION ErfD# (Nr AS DOUBLE)
  12.    N = INT(14# * Nr + 3#)
  13.    S = 1# / (2# * N - 1#)
  14.    FOR J = N - 1# TO 1# STEP -1#
  15.       S = 1# / (2# * J - 1#) - Nr * Nr / J * S
  16.    NEXT
  17.    ErfD# = Nr / .8862269254527581# * S
  18. END FUNCTION
  19.