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(/ N) now returns the reciprocal of N
This is more compatible with Common Lisp and XEmacs (Bug#21690). See: http://lists.gnu.org/archive/html/emacs-devel/2015-10/msg01053.html * lisp/color.el (color-hue-to-rgb, color-hsl-to-rgb) (color-xyz-to-srgb, color-xyz-to-lab): * lisp/emacs-lisp/cl-extra.el (cl-float-limits): * lisp/net/shr-color.el (shr-color-hue-to-rgb) (shr-color-hsl-to-rgb-fractions): Exploit the change to simplify the code a bit. * lisp/emacs-lisp/bytecomp.el (byte-compile-quo): Don’t complain about single-argument calls to ‘/’. * src/data.c (arith_driver, float_arith_driver): Implement the change.
This commit is contained in:
Paul Eggert
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513fe25a50
commit
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@ -642,10 +642,11 @@ product. When given no arguments, @code{*} returns 1.
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@end example
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@end defun
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@defun / dividend divisor &rest divisors
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This function divides @var{dividend} by @var{divisor} and returns the
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quotient. If there are additional arguments @var{divisors}, then it
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divides @var{dividend} by each divisor in turn. Each argument may be a
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@defun / number &rest divisors
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With one or more @var{divisors}, this function divides @var{number}
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by each divisor in @var{divisors} in turn, and returns the quotient.
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With no @var{divisors}, this function returns 1/@var{number}, i.e.,
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the multiplicative inverse of @var{number}. Each argument may be a
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number or a marker.
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If all the arguments are integers, the result is an integer, obtained
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@ -673,6 +674,14 @@ by rounding the quotient towards zero after each division.
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@result{} 2.5
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@end group
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@group
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(/ 4.0)
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@result{} 0.25
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@end group
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@group
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(/ 4)
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@result{} 0
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@end group
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@group
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(/ 25 3 2)
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@result{} 4
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@end group
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6
etc/NEWS
6
etc/NEWS
@ -1008,6 +1008,12 @@ dynamically.
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dynamically. Any third-party code that changes these templates should
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be updated accordingly.
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+++
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** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
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The new behavior is compatible with Common Lisp and with XEmacs.
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This change does not affect Lisp code intended to be portable to
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Emacs 24.2 and earlier, which did not support unary ‘/’.
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* Lisp Changes in Emacs 25.1
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@ -93,7 +93,7 @@ resulting list."
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"Compute hue from V1 and V2 H.
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Used internally by `color-hsl-to-rgb'."
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(cond
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((< h (/ 1.0 6)) (+ v1 (* (- v2 v1) h 6.0)))
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((< h (/ 6.0)) (+ v1 (* (- v2 v1) h 6.0)))
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((< h 0.5) v2)
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((< h (/ 2.0 3)) (+ v1 (* (- v2 v1) (- (/ 2.0 3) h) 6.0)))
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(t v1)))
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@ -110,9 +110,9 @@ inclusive."
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(- (+ L S) (* L S))))
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(m1 (- (* 2.0 L) m2)))
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(list
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(color-hue-to-rgb m1 m2 (mod (+ H (/ 1.0 3)) 1))
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(color-hue-to-rgb m1 m2 (mod (+ H (/ 3.0)) 1))
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(color-hue-to-rgb m1 m2 H)
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(color-hue-to-rgb m1 m2 (mod (- H (/ 1.0 3)) 1))))))
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(color-hue-to-rgb m1 m2 (mod (- H (/ 3.0)) 1))))))
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(defun color-complement-hex (color)
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"Return the color that is the complement of COLOR, in hexadecimal format."
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@ -199,13 +199,13 @@ RED, GREEN and BLUE should be between 0.0 and 1.0, inclusive."
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(b (+ (* 0.0556434 X) (* -0.2040259 Y) (* 1.0572252 Z))))
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(list (if (<= r 0.0031308)
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(* 12.92 r)
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(- (* 1.055 (expt r (/ 1 2.4))) 0.055))
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(- (* 1.055 (expt r (/ 2.4))) 0.055))
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(if (<= g 0.0031308)
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(* 12.92 g)
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(- (* 1.055 (expt g (/ 1 2.4))) 0.055))
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(- (* 1.055 (expt g (/ 2.4))) 0.055))
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(if (<= b 0.0031308)
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(* 12.92 b)
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(- (* 1.055 (expt b (/ 1 2.4))) 0.055)))))
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(- (* 1.055 (expt b (/ 2.4))) 0.055)))))
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(defconst color-d65-xyz '(0.950455 1.0 1.088753)
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"D65 white point in CIE XYZ.")
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@ -222,13 +222,13 @@ conversion. If omitted or nil, use `color-d65-xyz'."
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(yr (/ Y Yr))
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(zr (/ Z Zr))
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(fx (if (> xr color-cie-ε)
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(expt xr (/ 1 3.0))
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(expt xr (/ 3.0))
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(/ (+ (* color-cie-κ xr) 16) 116.0)))
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(fy (if (> yr color-cie-ε)
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(expt yr (/ 1 3.0))
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(expt yr (/ 3.0))
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(/ (+ (* color-cie-κ yr) 16) 116.0)))
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(fz (if (> zr color-cie-ε)
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(expt zr (/ 1 3.0))
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(expt zr (/ 3.0))
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(/ (+ (* color-cie-κ zr) 16) 116.0))))
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(list
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(- (* 116 fy) 16) ; L
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@ -3617,8 +3617,8 @@ discarding."
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(defun byte-compile-quo (form)
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(let ((len (length form)))
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(cond ((<= len 2)
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(byte-compile-subr-wrong-args form "2 or more"))
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(cond ((< len 2)
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(byte-compile-subr-wrong-args form "1 or more"))
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((= len 3)
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(byte-compile-two-args form))
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(t
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@ -497,7 +497,7 @@ This sets the values of: `cl-most-positive-float', `cl-most-negative-float',
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(setq cl-least-positive-normalized-float y
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cl-least-negative-normalized-float (- y))
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;; Divide down until value underflows to zero.
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(setq x (/ 1 z) y x)
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(setq x (/ z) y x)
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(while (condition-case _ (> (/ x 2) 0) (arith-error nil))
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(setq x (/ x 2)))
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(setq cl-least-positive-float x
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@ -211,7 +211,7 @@ This will convert \"80 %\" to 204, \"100 %\" to 255 but \"123\" to \"123\"."
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"Convert X Y H to RGB value."
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(when (< h 0) (incf h))
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(when (> h 1) (decf h))
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(cond ((< h (/ 1 6.0)) (+ x (* (- y x) h 6)))
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(cond ((< h (/ 6.0)) (+ x (* (- y x) h 6)))
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((< h 0.5) y)
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((< h (/ 2.0 3.0)) (+ x (* (- y x) (- (/ 2.0 3.0) h) 6)))
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(t x)))
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@ -223,9 +223,9 @@ This will convert \"80 %\" to 204, \"100 %\" to 255 but \"123\" to \"123\"."
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(setq m2 (* l (+ s 1)))
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(setq m2 (- (+ l s) (* l s))))
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(setq m1 (- (* l 2) m2))
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(list (shr-color-hue-to-rgb m1 m2 (+ h (/ 1 3.0)))
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(list (shr-color-hue-to-rgb m1 m2 (+ h (/ 3.0)))
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(shr-color-hue-to-rgb m1 m2 h)
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(shr-color-hue-to-rgb m1 m2 (- h (/ 1 3.0))))))
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(shr-color-hue-to-rgb m1 m2 (- h (/ 3.0))))))
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(defun shr-color->hexadecimal (color)
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"Convert any color format to hexadecimal representation.
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11
src/data.c
11
src/data.c
@ -2603,6 +2603,7 @@ arith_driver (enum arithop code, ptrdiff_t nargs, Lisp_Object *args)
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accum = 0;
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break;
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case Amult:
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case Adiv:
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accum = 1;
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break;
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case Alogand:
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@ -2658,7 +2659,7 @@ arith_driver (enum arithop code, ptrdiff_t nargs, Lisp_Object *args)
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accum *= next;
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break;
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case Adiv:
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if (!argnum)
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if (! (argnum || nargs == 1))
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accum = next;
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else
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{
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@ -2727,7 +2728,7 @@ float_arith_driver (double accum, ptrdiff_t argnum, enum arithop code,
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accum *= next;
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break;
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case Adiv:
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if (!argnum)
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if (! (argnum || nargs == 1))
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accum = next;
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else
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{
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@ -2782,9 +2783,11 @@ usage: (* &rest NUMBERS-OR-MARKERS) */)
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}
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DEFUN ("/", Fquo, Squo, 1, MANY, 0,
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doc: /* Return first argument divided by all the remaining arguments.
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doc: /* Divide number by divisors and return the result.
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With two or more arguments, return first argument divided by the rest.
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With one argument, return 1 divided by the argument.
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The arguments must be numbers or markers.
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usage: (/ DIVIDEND &rest DIVISORS) */)
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usage: (/ NUMBER &rest DIVISORS) */)
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(ptrdiff_t nargs, Lisp_Object *args)
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{
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ptrdiff_t argnum;
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