зеркало из https://github.com/github/ruby.git
Enhanced RDoc for Float#prev_float (#5162)
* Enhanced RDoc for Float#prev_float
This commit is contained in:
Burdette Lamar
GitHub
Родитель
1dcfcb6bc5
Коммит
7c3041047e
73
numeric.c
73
numeric.c
|
|
@ -1987,16 +1987,14 @@ flo_nextafter(VALUE flo, double value)
|
|||
* f.next_float # 0x3f847ae147ae147c
|
||||
*
|
||||
* In the remaining examples here, the output is shown in the usual way
|
||||
* (result +to_s+);
|
||||
*
|
||||
* Float::MAX.next_float # => Infinity
|
||||
* (result +to_s+):
|
||||
*
|
||||
* 0.01.next_float # => 0.010000000000000002
|
||||
* 1.0.next_float # => 1.0000000000000002
|
||||
* 100.0.next_float # => 100.00000000000001
|
||||
*
|
||||
* f = 0.01
|
||||
* (0..19).each_with_index {|i| printf "%2d %-20a %s\n", i, f, f.to_s; f = f.next_float }
|
||||
* (0..3).each_with_index {|i| printf "%2d %-20a %s\n", i, f, f.to_s; f = f.next_float }
|
||||
*
|
||||
* Output:
|
||||
*
|
||||
|
|
@ -2004,22 +2002,6 @@ flo_nextafter(VALUE flo, double value)
|
|||
* 1 0x1.47ae147ae147cp-7 0.010000000000000002
|
||||
* 2 0x1.47ae147ae147dp-7 0.010000000000000004
|
||||
* 3 0x1.47ae147ae147ep-7 0.010000000000000005
|
||||
* 4 0x1.47ae147ae147fp-7 0.010000000000000007
|
||||
* 5 0x1.47ae147ae148p-7 0.010000000000000009
|
||||
* 6 0x1.47ae147ae1481p-7 0.01000000000000001
|
||||
* 7 0x1.47ae147ae1482p-7 0.010000000000000012
|
||||
* 8 0x1.47ae147ae1483p-7 0.010000000000000014
|
||||
* 9 0x1.47ae147ae1484p-7 0.010000000000000016
|
||||
* 10 0x1.47ae147ae1485p-7 0.010000000000000018
|
||||
* 11 0x1.47ae147ae1486p-7 0.01000000000000002
|
||||
* 12 0x1.47ae147ae1487p-7 0.010000000000000021
|
||||
* 13 0x1.47ae147ae1488p-7 0.010000000000000023
|
||||
* 14 0x1.47ae147ae1489p-7 0.010000000000000024
|
||||
* 15 0x1.47ae147ae148ap-7 0.010000000000000026
|
||||
* 16 0x1.47ae147ae148bp-7 0.010000000000000028
|
||||
* 17 0x1.47ae147ae148cp-7 0.01000000000000003
|
||||
* 18 0x1.47ae147ae148dp-7 0.010000000000000031
|
||||
* 19 0x1.47ae147ae148ep-7 0.010000000000000033
|
||||
*
|
||||
* f = 0.0; 100.times { f += 0.1 }
|
||||
* f # => 9.99999999999998 # should be 10.0 in the ideal world.
|
||||
|
|
@ -2030,6 +2012,8 @@ flo_nextafter(VALUE flo, double value)
|
|||
* "%a" % 10 # => "0x1.4p+3"
|
||||
* "%a" % f # => "0x1.3fffffffffff5p+3" # the last hex digit is 5. 16 - 5 = 11 ulp.
|
||||
*
|
||||
* Related: Float#prev_float
|
||||
*
|
||||
*/
|
||||
static VALUE
|
||||
flo_next_float(VALUE vx)
|
||||
|
|
@ -2041,43 +2025,36 @@ flo_next_float(VALUE vx)
|
|||
* call-seq:
|
||||
* float.prev_float -> float
|
||||
*
|
||||
* Returns the previous representable floating point number.
|
||||
* Returns the next-smaller representable \Float.
|
||||
*
|
||||
* (-Float::MAX).prev_float and (-Float::INFINITY).prev_float is -Float::INFINITY.
|
||||
* These examples show the internally stored values (64-bit hexadecimal)
|
||||
* for each \Float +f+ and for the corresponding <tt>f.pev_float</tt>:
|
||||
*
|
||||
* Float::NAN.prev_float is Float::NAN.
|
||||
* f = 5e-324 # 0x0000000000000001
|
||||
* f.prev_float # 0x0000000000000000
|
||||
*
|
||||
* For example:
|
||||
* f = 0.01 # 0x3f847ae147ae147b
|
||||
* f.prev_float # 0x3f847ae147ae147a
|
||||
*
|
||||
* In the remaining examples here, the output is shown in the usual way
|
||||
* (result +to_s+):
|
||||
*
|
||||
* 0.01.prev_float # => 0.009999999999999998
|
||||
* 1.0.prev_float # => 0.9999999999999999
|
||||
* 100.0.prev_float # => 99.99999999999999
|
||||
*
|
||||
* 0.01 - 0.01.prev_float #=> 1.734723475976807e-18
|
||||
* 1.0 - 1.0.prev_float #=> 1.1102230246251565e-16
|
||||
* 100.0 - 100.0.prev_float #=> 1.4210854715202004e-14
|
||||
* f = 0.01
|
||||
* (0..3).each_with_index {|i| printf "%2d %-20a %s\n", i, f, f.to_s; f = f.prev_float }
|
||||
*
|
||||
* Output:
|
||||
*
|
||||
* 0 0x1.47ae147ae147bp-7 0.01
|
||||
* 1 0x1.47ae147ae147ap-7 0.009999999999999998
|
||||
* 2 0x1.47ae147ae1479p-7 0.009999999999999997
|
||||
* 3 0x1.47ae147ae1478p-7 0.009999999999999995
|
||||
*
|
||||
* Related: Float#next_float.
|
||||
*
|
||||
* f = 0.01; 20.times { printf "%-20a %s\n", f, f.to_s; f = f.prev_float }
|
||||
* #=> 0x1.47ae147ae147bp-7 0.01
|
||||
* # 0x1.47ae147ae147ap-7 0.009999999999999998
|
||||
* # 0x1.47ae147ae1479p-7 0.009999999999999997
|
||||
* # 0x1.47ae147ae1478p-7 0.009999999999999995
|
||||
* # 0x1.47ae147ae1477p-7 0.009999999999999993
|
||||
* # 0x1.47ae147ae1476p-7 0.009999999999999992
|
||||
* # 0x1.47ae147ae1475p-7 0.00999999999999999
|
||||
* # 0x1.47ae147ae1474p-7 0.009999999999999988
|
||||
* # 0x1.47ae147ae1473p-7 0.009999999999999986
|
||||
* # 0x1.47ae147ae1472p-7 0.009999999999999985
|
||||
* # 0x1.47ae147ae1471p-7 0.009999999999999983
|
||||
* # 0x1.47ae147ae147p-7 0.009999999999999981
|
||||
* # 0x1.47ae147ae146fp-7 0.00999999999999998
|
||||
* # 0x1.47ae147ae146ep-7 0.009999999999999978
|
||||
* # 0x1.47ae147ae146dp-7 0.009999999999999976
|
||||
* # 0x1.47ae147ae146cp-7 0.009999999999999974
|
||||
* # 0x1.47ae147ae146bp-7 0.009999999999999972
|
||||
* # 0x1.47ae147ae146ap-7 0.00999999999999997
|
||||
* # 0x1.47ae147ae1469p-7 0.009999999999999969
|
||||
* # 0x1.47ae147ae1468p-7 0.009999999999999967
|
||||
*/
|
||||
static VALUE
|
||||
flo_prev_float(VALUE vx)
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче