/[emacs]/emacs/lisp/float-sup.el
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revision 1.8 by pj, Sun Jul 15 16:15:34 2001 UTC revision 1.9 by pj, Tue Dec 11 07:32:00 2001 UTC
# Line 27  Line 27 
27    
28  ;; Provide a meaningful error message if we are running on  ;; Provide a meaningful error message if we are running on
29  ;; bare (non-float) emacs.  ;; bare (non-float) emacs.
 ;; Can't test for 'floatp since that may be defined by float-imitation  
 ;; packages like float.el in this very directory.  
30    
31  (if (fboundp 'atan)  (if (fboundp 'atan)
32      nil      nil
# Line 36  Line 34 
34    
35  ;; provide an easy hook to tell if we are running with floats or not.  ;; provide an easy hook to tell if we are running with floats or not.
36  ;; define pi and e via math-lib calls. (much less prone to killer typos.)  ;; define pi and e via math-lib calls. (much less prone to killer typos.)
37  (defconst pi (* 4 (atan 1)) "The value of Pi (3.1415926...)")  (defconst pi (* 4 (atan 1)) "The value of Pi (3.1415926...).")
38  (defconst e (exp 1) "The value of e (2.7182818...)")  (defconst e (exp 1) "The value of e (2.7182818...).")
39    
40  ;; Careful when editing this file ... typos here will be hard to spot.  ;; Careful when editing this file ... typos here will be hard to spot.
41  ;; (defconst pi       3.14159265358979323846264338327  ;; (defconst pi       3.14159265358979323846264338327
42  ;;  "The value of Pi (3.14159265358979323846264338327...)")  ;;  "The value of Pi (3.14159265358979323846264338327...)")
43    
44  (defconst degrees-to-radians (/ pi 180.0)  (defconst degrees-to-radians (/ pi 180.0)
45    "Degrees to radian conversion constant")    "Degrees to radian conversion constant.")
46  (defconst radians-to-degrees (/ 180.0 pi)  (defconst radians-to-degrees (/ 180.0 pi)
47    "Radian to degree conversion constant")    "Radian to degree conversion constant.")
48    
49  ;; these expand to a single multiply by a float when byte compiled  ;; these expand to a single multiply by a float when byte compiled
50    

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