src/numerical/slatec/derf.lisp

   1 ;;; Compiled by f2cl version:
   2 ;;; ("f2cl1.l,v 46c1f6a93b0d 2012/05/03 04:40:28 toy $"
   3 ;;;  "f2cl2.l,v 96616d88fb7e 2008/02/22 22:19:34 rtoy $"
   4 ;;;  "f2cl3.l,v 96616d88fb7e 2008/02/22 22:19:34 rtoy $"
   5 ;;;  "f2cl4.l,v 96616d88fb7e 2008/02/22 22:19:34 rtoy $"
   6 ;;;  "f2cl5.l,v 46c1f6a93b0d 2012/05/03 04:40:28 toy $"
   7 ;;;  "f2cl6.l,v 1d5cbacbb977 2008/08/24 00:56:27 rtoy $"
   8 ;;;  "macros.l,v fceac530ef0c 2011/11/26 04:02:26 toy $")
   9
  10 ;;; Using Lisp CMU Common Lisp snapshot-2012-04 (20C Unicode)
  11 ;;;
  12 ;;; Options: ((:prune-labels nil) (:auto-save t) (:relaxed-array-decls t)
  13 ;;;           (:coerce-assigns :as-needed) (:array-type ':simple-array)
  14 ;;;           (:array-slicing nil) (:declare-common nil)
  15 ;;;           (:float-format double-float))
  16
  17 (in-package :slatec)
  18
  19
  20 (let ((nterf 0)
  21       (xbig 0.0)
  22       (sqeps 0.0)
  23       (erfcs
  24        (make-array 21
  25                    :element-type 'double-float
  26                    :initial-contents '(-0.049046121234691806
  27                                        -0.14226120510371365
  28                                        0.010035582187599796
  29                                        -5.768764699767485e-4
  30                                        2.741993125219606e-5
  31                                        -1.1043175507344507e-6
  32                                        3.8488755420345036e-8
  33                                        -1.1808582533875466e-9
  34                                        3.2334215826050907e-11
  35                                        -7.991015947004549e-13
  36                                        1.7990725113961456e-14
  37                                        -3.718635487818693e-16
  38                                        7.103599003714253e-18
  39                                        -1.2612455119155226e-19
  40                                        2.0916406941769294e-21
  41                                        -3.2539731029314073e-23
  42                                        4.766867209797675e-25
  43                                        -6.598012078285134e-27
  44                                        8.655011469963763e-29
  45                                        -1.0788925177498064e-30
  46                                        1.2811883993017003e-32)))
  47       (sqrtpi 1.772453850905516)
  48       (first$ nil))
  49   (declare (type (f2cl-lib:integer4) nterf)
  50            (type (double-float) xbig sqeps sqrtpi)
  51            (type (simple-array double-float (21)) erfcs)
  52            (type f2cl-lib:logical first$))
  53   (setq first$ f2cl-lib:%true%)
  54   (defun derf (x)
  55     (declare (type (double-float) x))
  56     (prog ((y 0.0) (derf 0.0))
  57       (declare (type (double-float) derf y))
  58       (cond
  59         (first$
  60          (setf nterf
  61                  (initds erfcs 21
  62                   (* 0.1f0 (f2cl-lib:freal (f2cl-lib:d1mach 3)))))
  63          (setf xbig
  64                  (f2cl-lib:fsqrt
  65                   (- (f2cl-lib:flog (* sqrtpi (f2cl-lib:d1mach 3))))))
  66          (setf sqeps (f2cl-lib:fsqrt (* 2.0 (f2cl-lib:d1mach 3))))))
  67       (setf first$ f2cl-lib:%false%)
  68       (setf y (abs x))
  69       (if (> y 1.0) (go label20))
  70       (if (<= y sqeps) (setf derf (/ (* 2.0 x) sqrtpi)))
  71       (if (> y sqeps)
  72           (setf derf (* x (+ 1.0 (dcsevl (- (* 2.0 x x) 1.0) erfcs nterf)))))
  73       (go end_label)
  74      label20
  75       (if (<= y xbig) (setf derf (f2cl-lib:sign (- 1.0 (derfc y)) x)))
  76       (if (> y xbig) (setf derf (f2cl-lib:sign 1.0 x)))
  77       (go end_label)
  78      end_label
  79       (return (values derf nil)))))
  80
  81 (in-package #:cl-user)
  82 #+#.(cl:if (cl:find-package '#:f2cl) '(and) '(or))
  83 (eval-when (:load-toplevel :compile-toplevel :execute)
  84   (setf (gethash 'fortran-to-lisp::derf fortran-to-lisp::*f2cl-function-info*)
  85           (fortran-to-lisp::make-f2cl-finfo :arg-types '((double-float))
  86                                             :return-values '(nil)
  87                                             :calls '(fortran-to-lisp::derfc
  88                                                      fortran-to-lisp::dcsevl
  89                                                      fortran-to-lisp::initds
  90                                                      fortran-to-lisp::d1mach))))
  91