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- Log ----------------------------------------------------------------- commit 104efdeae6ef52c5d370e0b3a048a5087cdb1ea2 Author: Raymond Toy toy.raymond@gmail.com Date: Tue Apr 10 20:36:11 2012 -0700

VALUE-OR-TINY returned a value that was too tiny.

* qd-gamma.lisp:: * Return sqrt(least-positive-normalized-double) instead of least-positive-normalized-double. * rt-tests.lisp:: * Add test for this case.

diff --git a/qd-gamma.lisp b/qd-gamma.lisp index 25fa38e..40a45eb 100644 --- a/qd-gamma.lisp +++ b/qd-gamma.lisp @@ -216,9 +216,9 @@ (incf tiny-value-count) (etypecase v ((or double-float cl:complex) - least-positive-normalized-double-float) + (sqrt least-positive-normalized-double-float)) ((or qd-real qd-complex) - (make-qd least-positive-normalized-double-float)))) + (make-qd (sqrt least-positive-normalized-double-float))))) v))) (let* ((f (value-or-tiny (funcall bf 0))) (c f) @@ -241,7 +241,7 @@ (setf d (/ d)) (setf f (* f delta)) (when *debug-cf-eval* - (format t " dl= ~S~%" delta) + (format t " dl= ~S (|dl - 1| = ~S)~%" delta (abs (1- delta))) (format t " f = ~S~%" f)) (when (<= (abs (- delta 1)) eps) (return-from lentz (values f j tiny-value-count))))) diff --git a/rt-tests.lisp b/rt-tests.lisp index 0544ea8..192b118 100644 --- a/rt-tests.lisp +++ b/rt-tests.lisp @@ -1234,6 +1234,16 @@ append (list (list (list k m) result))) nil)  +(rt:deftest lentz + ;; This isn't really a test of cf-incomplete-gamma. It's a test + ;; that Lentz's algorithm works in this case. For these args, + ;; cf-incomplete-gamma used to generate an overflow or division by + ;; zero because value-or-tiny was too tiny. + (let ((g (cf-incomplete-gamma 3d0 5d0)) + (true (- 2 (* 37 (exp -5d0))))) + (check-accuracy 53 g true)) + nil) + (rt:deftest gamma.1.d (let ((g (gamma 0.5d0)) (true (sqrt pi)))

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Summary of changes: qd-gamma.lisp | 6 +++--- rt-tests.lisp | 10 ++++++++++ 2 files changed, 13 insertions(+), 3 deletions(-)

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