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- Log ----------------------------------------------------------------- commit fe8cffb5ee8e7161addf7586ecaee00682c6bf1b Author: Raymond Toy toy.raymond@gmail.com Date: Thu Mar 22 22:58:43 2012 -0700

Clean up implemenation of s-exp-integral-e a bit.

diff --git a/qd-gamma.lisp b/qd-gamma.lisp index 13f0bd9..e353ff5 100644 --- a/qd-gamma.lisp +++ b/qd-gamma.lisp @@ -497,18 +497,19 @@ (if (and (realp v) (= v (ftruncate v))) ;; v is an integer - (let ((n (truncate v))) - (- (* (/ (expt -z (- v 1)) + (let* ((n (truncate v)) + (n-1 (1- n))) + (- (* (/ (expt -z n-1) (gamma v)) (- (psi v) (log z))) (loop for k from 0 - for term = 1 then (* term (/ -z k)) - for sum = (/ (- 1 v)) then (+ sum (let ((denom (+ k 1 (- n)))) + for term = 1 then (* term (/ -z k)) + for sum = (/ (- 1 v)) then (+ sum (let ((denom (- k n-1))) (if (zerop denom) 0 - (/ term (+ k 1 -v))))) - when (< (abs term) (* (abs sum) eps)) - return sum))) + (/ term denom)))) + when (< (abs term) (* (abs sum) eps)) + return sum))) (loop for k from 0 for term = 1 then (* term (/ -z k)) for sum = (/ (- 1 v)) then (+ sum (/ term (+ k 1 -v)))

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Summary of changes: qd-gamma.lisp | 15 ++++++++------- 1 files changed, 8 insertions(+), 7 deletions(-)

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