diff options
Diffstat (limited to 'lisp/emacs-lisp/float-sup.el')
| -rw-r--r-- | lisp/emacs-lisp/float-sup.el | 38 |
1 files changed, 15 insertions, 23 deletions
diff --git a/lisp/emacs-lisp/float-sup.el b/lisp/emacs-lisp/float-sup.el index 6a05bda82ae..371fe8af3ad 100644 --- a/lisp/emacs-lisp/float-sup.el +++ b/lisp/emacs-lisp/float-sup.el @@ -1,10 +1,11 @@ ;;; float-sup.el --- define some constants useful for floating point numbers. -;; Copyright (C) 1985, 1986, 1987, 2001, 2002, 2003, 2004, -;; 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. +;; Copyright (C) 1985, 1986, 1987, 2001, 2002, 2003, 2004, 2005, 2006, +;; 2007, 2008, 2009, 2010 Free Software Foundation, Inc. ;; Maintainer: FSF ;; Keywords: internal +;; Package: emacs ;; This file is part of GNU Emacs. @@ -25,36 +26,27 @@ ;;; Code: -;; Provide a meaningful error message if we are running on -;; bare (non-float) emacs. +;; Provide an easy hook to tell if we are running with floats or not. +;; Define pi and e via math-lib calls (much less prone to killer typos). +(defconst float-pi (* 4 (atan 1)) "The value of Pi (3.1415926...).") +(defconst pi float-pi "Obsolete since Emacs-23.3. Use `float-pi' instead.") -(if (fboundp 'atan) - nil - (error "Floating point was disabled at compile time")) +(defconst float-e (exp 1) "The value of e (2.7182818...).") -;; provide an easy hook to tell if we are running with floats or not. -;; define pi and e via math-lib calls. (much less prone to killer typos.) -(defconst pi (* 4 (atan 1)) "The value of Pi (3.1415926...).") - -;; It's too inconvenient to make `e' a constant because it's used as -;; a temporary variable all the time. -(defvar e (exp 1) "The value of e (2.7182818...).") - -(defconst degrees-to-radians (/ pi 180.0) +(defconst degrees-to-radians (/ float-pi 180.0) "Degrees to radian conversion constant.") -(defconst radians-to-degrees (/ 180.0 pi) +(defconst radians-to-degrees (/ 180.0 float-pi) "Radian to degree conversion constant.") -;; these expand to a single multiply by a float when byte compiled +;; These expand to a single multiply by a float when byte compiled. (defmacro degrees-to-radians (x) - "Convert ARG from degrees to radians." - (list '* (/ pi 180.0) x)) + "Convert X from degrees to radians." + (list '* degrees-to-radians x)) (defmacro radians-to-degrees (x) - "Convert ARG from radians to degrees." - (list '* (/ 180.0 pi) x)) + "Convert X from radians to degrees." + (list '* radians-to-degrees x)) (provide 'lisp-float-type) -;; arch-tag: e7837072-a4af-4d08-9953-8a3e755abf9d ;;; float-sup.el ends here |