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- Log ----------------------------------------------------------------- commit 20ee8ef20cd01a0be841695d6beaf98968e5be31 Author: Raymond Toy toy.raymond@gmail.com Date: Thu Nov 7 22:33:42 2013 -0800
Add shortcut for (expt -1 power).
diff --git a/src/code/irrat.lisp b/src/code/irrat.lisp index 67ca060..927a5fb 100644 --- a/src/code/irrat.lisp +++ b/src/code/irrat.lisp @@ -318,11 +318,13 @@ ;;; of power are calculated as positive integers, and inverted if negative. ;;; (defun intexp (base power) - ;; Handle the special case of 1^power. Maxima sometimes does this, - ;; and there's no need to cause a continuable error in this case. - ;; Should we also handle (-1)^power? + ;; Handle the special case of 1^power and (-1)^power. Maxima + ;; sometimes does this, and there's no need to cause a continuable + ;; error in this case. (when (eql base 1) (return-from intexp base)) + (when (eql base -1) + (return-from intexp (if (oddp power) -1 1)))
(when (> (abs power) *intexp-maximum-exponent*) ;; Allow user the option to continue with calculation, possibly
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Summary of changes: src/code/irrat.lisp | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
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