Commit 129afba460bd654230c8d678a53d7a1b5fec9132 | zig

author	Evin Yulo <yujiri@disroot.org> 2023-05-24 19:10:44-04:00
committer	Andrew Kelley <andrew@ziglang.org> 2023-06-13 11:29:28-07:00
log	129afba460bd654230c8d678a53d7a1b5fec9132
tree	d714ddf3b1b77300080c53fd2b3fe90b5d5f7614
parent	21c258acac500a8fd35591514e4847ec489b8283

publicize std.rand.ziggurat

2 files changed, 12 insertions(+), 12 deletions(-)

lib
- std
  - rand.zig
  - rand
    ziggurat.zig

lib/std/rand.zig+1-1

...	...	@@ -11,7 +11,6 @@ const builtin = @import("builtin");
11	11	const assert = std.debug.assert;
12	12	const mem = std.mem;
13	13	const math = std.math;
14		const ziggurat = @import("rand/ziggurat.zig");
15	14	const maxInt = std.math.maxInt;
16	15
17	16	/// Fast unbiased random numbers.
...	...	@@ -29,6 +28,7 @@ pub const Xoroshiro128 = @import("rand/Xoroshiro128.zig");
29	28	pub const Xoshiro256 = @import("rand/Xoshiro256.zig");
30	29	pub const Sfc64 = @import("rand/Sfc64.zig");
31	30	pub const RomuTrio = @import("rand/RomuTrio.zig");
	31	pub const ziggurat = @import("rand/ziggurat.zig");
32	32
33	33	pub const Random = struct {
34	34	ptr: *anyopaque,

lib/std/rand/ziggurat.zig+11-11

...	...	@@ -65,7 +65,7 @@ pub const ZigTable = struct {
65	65	};
66	66
67	67	// zigNorInit
68		fn ZigTableGen(
	68	pub fn ZigTableGen(
69	69	comptime is_symmetric: bool,
70	70	comptime r: f64,
71	71	comptime v: f64,
...	...	@@ -102,16 +102,16 @@ pub const NormDist = blk: {
102	102	break :blk ZigTableGen(true, norm_r, norm_v, norm_f, norm_f_inv, norm_zero_case);
103	103	};
104	104
105		const norm_r = 3.6541528853610088;
106		const norm_v = 0.00492867323399;
	105	pub const norm_r = 3.6541528853610088;
	106	pub const norm_v = 0.00492867323399;
107	107
108		fn norm_f(x: f64) f64 {
	108	pub fn norm_f(x: f64) f64 {
109	109	return @exp(-x * x / 2.0);
110	110	}
111		fn norm_f_inv(y: f64) f64 {
	111	pub fn norm_f_inv(y: f64) f64 {
112	112	return @sqrt(-2.0 * @log(y));
113	113	}
114		fn norm_zero_case(random: Random, u: f64) f64 {
	114	pub fn norm_zero_case(random: Random, u: f64) f64 {
115	115	var x: f64 = 1;
116	116	var y: f64 = 0;
117	117
...	...	@@ -143,16 +143,16 @@ pub const ExpDist = blk: {
143	143	break :blk ZigTableGen(false, exp_r, exp_v, exp_f, exp_f_inv, exp_zero_case);
144	144	};
145	145
146		const exp_r = 7.69711747013104972;
147		const exp_v = 0.0039496598225815571993;
	146	pub const exp_r = 7.69711747013104972;
	147	pub const exp_v = 0.0039496598225815571993;
148	148
149		fn exp_f(x: f64) f64 {
	149	pub fn exp_f(x: f64) f64 {
150	150	return @exp(-x);
151	151	}
152		fn exp_f_inv(y: f64) f64 {
	152	pub fn exp_f_inv(y: f64) f64 {
153	153	return -@log(y);
154	154	}
155		fn exp_zero_case(random: Random, _: f64) f64 {
	155	pub fn exp_zero_case(random: Random, _: f64) f64 {
156	156	return exp_r - @log(random.float(f64));
157	157	}
158	158