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1 | ;;; float-sup.el --- define some constants useful for floating point numbers. |
2 | ||
acaf905b | 3 | ;; Copyright (C) 1985-1987, 2001-2012 Free Software Foundation, Inc. |
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4 | |
5 | ;; Maintainer: FSF | |
6 | ;; Keywords: internal | |
bd78fa1d | 7 | ;; Package: emacs |
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8 | |
9 | ;; This file is part of GNU Emacs. | |
10 | ||
d6cba7ae | 11 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
5e046f6d | 12 | ;; it under the terms of the GNU General Public License as published by |
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13 | ;; the Free Software Foundation, either version 3 of the License, or |
14 | ;; (at your option) any later version. | |
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15 | |
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
d6cba7ae | 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
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23 | |
24 | ;;; Commentary: | |
25 | ||
26 | ;;; Code: | |
27 | ||
9a0dd02d GM |
28 | ;; Provide an easy hook to tell if we are running with floats or not. |
29 | ;; Define pi and e via math-lib calls (much less prone to killer typos). | |
9e0d4f9e | 30 | (defconst float-pi (* 4 (atan 1)) "The value of Pi (3.1415926...).") |
06788a55 SM |
31 | (progn |
32 | ;; Simulate a defconst that doesn't declare the variable dynamically bound. | |
33 | (setq-default pi float-pi) | |
34 | (put 'pi 'variable-documentation | |
35 | "Obsolete since Emacs-23.3. Use `float-pi' instead.") | |
36 | (put 'pi 'risky-local-variable t) | |
37 | (push 'pi current-load-list)) | |
8f92ec4d | 38 | |
9e0d4f9e | 39 | (defconst float-e (exp 1) "The value of e (2.7182818...).") |
5e046f6d | 40 | |
9e0d4f9e | 41 | (defconst degrees-to-radians (/ float-pi 180.0) |
5e046f6d | 42 | "Degrees to radian conversion constant.") |
9e0d4f9e | 43 | (defconst radians-to-degrees (/ 180.0 float-pi) |
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44 | "Radian to degree conversion constant.") |
45 | ||
9a0dd02d | 46 | ;; These expand to a single multiply by a float when byte compiled. |
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47 | |
48 | (defmacro degrees-to-radians (x) | |
99368725 | 49 | "Convert X from degrees to radians." |
9e0d4f9e | 50 | (list '* degrees-to-radians x)) |
5e046f6d | 51 | (defmacro radians-to-degrees (x) |
99368725 | 52 | "Convert X from radians to degrees." |
9e0d4f9e | 53 | (list '* radians-to-degrees x)) |
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54 | |
55 | (provide 'lisp-float-type) | |
56 | ||
57 | ;;; float-sup.el ends here |