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- Log ----------------------------------------------------------------- commit e9cd1a46fcf2a5c0101b3473648cb242b55987e8 Author: Raymond Toy rtoy@google.com Date: Tue Apr 10 09:51:55 2012 -0700

Fix bug in s-bessel-j. Microoptimize integer-bessel-j-exp-arc for the case where v is an integer.

diff --git a/qd-bessel.lisp b/qd-bessel.lisp index 9759044..367b847 100644 --- a/qd-bessel.lisp +++ b/qd-bessel.lisp @@ -171,18 +171,25 @@ (format t " sum - ~S~%" sum)))))

-;; This currently only works for v an integer. ;; (defun integer-bessel-j-exp-arc (v z) (let* ((iz (* #c(0 1) z)) - (i+ (exp-arc-i-2 iz v)) - (i- (exp-arc-i-2 (- iz ) v))) - (/ (+ (* (cis (* v (float-pi i+) -1/2)) - i+) - (* (cis (* v (float-pi i+) 1/2)) - i-)) - (float-pi i+) - 2))) + (i+ (exp-arc-i-2 iz v))) + (cond ((= v (ftruncate v)) + ;; We can simplify the result + (let ((c (cis (* v (float-pi i+) -1/2)))) + (/ (+ (* c i+) + (* (conjugate c) (conjugate i+))) + (float-pi i+) + 2))) + (t + (let ((i- (exp-arc-i-2 (- iz ) v))) + (/ (+ (* (cis (* v (float-pi i+) -1/2)) + i+) + (* (cis (* v (float-pi i+) 1/2)) + i-)) + (float-pi i+) + 2))))))

;; alpha[n](z) = integrate(exp(-z*s)*s^n, s, 0, 1/2) ;; beta[n](z) = integrate(exp(-z*s)*s^n, s, -1/2, 1/2) @@ -349,15 +356,18 @@ (eps (epsilon z))) (do* ((k 0 (+ 1 k)) (f (gamma (+ v 1)) - (* f (* k (+ v k)))) + (* k (+ v k))) (term (/ f) (/ (* (- term) z2/4) f)) (sum term (+ sum term))) ((<= (abs term) (* eps (abs sum))) (* sum (expt (* z 1/2) v))) - (format t "k = ~D~%" k) - (format t " term = ~S~%" term) - (format t " sum = ~S~%" sum))))) + #+nil + (progn + (format t "k = ~D~%" k) + (format t " f = ~S~%" f) + (format t " term = ~S~%" term) + (format t " sum = ~S~%" sum))))))

(defun bessel-j (v z) (let ((vv (ftruncate v)))

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Summary of changes: qd-bessel.lisp | 36 +++++++++++++++++++++++------------- 1 files changed, 23 insertions(+), 13 deletions(-)

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