Commit `be16034275`

Andrew Kelley <superjoe30@gmail.com>

2017-08-20 11:43:17

std.math: remove constants that can be derived

from others at compile time

master

1 parent f248ef5

Changed files (3)

std

math

atan.zig

atan2.zig

index.zig

@@ -239,8 +239,8 @@ test "math.atan32.special" {
 
     assert(atan32(0.0) == 0.0);
     assert(atan32(-0.0) == -0.0);
-    assert(math.approxEq(f32, atan32(math.inf(f32)), math.pi_2, epsilon));
-    assert(math.approxEq(f32, atan32(-math.inf(f32)), -math.pi_2, epsilon));
+    assert(math.approxEq(f32, atan32(math.inf(f32)), math.pi / 2.0, epsilon));
+    assert(math.approxEq(f32, atan32(-math.inf(f32)), -math.pi / 2.0, epsilon));
 }
 
 test "math.atan64.special" {
@@ -248,6 +248,6 @@ test "math.atan64.special" {
 
     assert(atan64(0.0) == 0.0);
     assert(atan64(-0.0) == -0.0);
-    assert(math.approxEq(f64, atan64(math.inf(f64)), math.pi_2, epsilon));
-    assert(math.approxEq(f64, atan64(-math.inf(f64)), -math.pi_2, epsilon));
+    assert(math.approxEq(f64, atan64(math.inf(f64)), math.pi / 2.0, epsilon));
+    assert(math.approxEq(f64, atan64(-math.inf(f64)), -math.pi / 2.0, epsilon));
 }

@@ -245,19 +245,19 @@ test "math.atan2_32.special" {
     assert(atan2_32(-0.0, 5.0) == -0.0);
     assert(math.approxEq(f32, atan2_32(0.0, -5.0), math.pi, epsilon));
     assert(math.approxEq(f32, atan2_32(-0.0, -5.0), -math.pi, epsilon));
-    assert(math.approxEq(f32, atan2_32(1.0, 0.0), math.pi_2, epsilon));
-    assert(math.approxEq(f32, atan2_32(1.0, -0.0), math.pi_2, epsilon));
-    assert(math.approxEq(f32, atan2_32(-1.0, 0.0), -math.pi_2, epsilon));
-    assert(math.approxEq(f32, atan2_32(-1.0, -0.0), -math.pi_2, epsilon));
-    assert(math.approxEq(f32, atan2_32(math.inf(f32), math.inf(f32)), math.pi_4, epsilon));
-    assert(math.approxEq(f32, atan2_32(-math.inf(f32), math.inf(f32)), -math.pi_4, epsilon));
-    assert(math.approxEq(f32, atan2_32(math.inf(f32), -math.inf(f32)), 3.0 * math.pi_4, epsilon));
-    assert(math.approxEq(f32, atan2_32(-math.inf(f32), -math.inf(f32)), -3.0 * math.pi_4, epsilon));
+    assert(math.approxEq(f32, atan2_32(1.0, 0.0), math.pi / 2.0, epsilon));
+    assert(math.approxEq(f32, atan2_32(1.0, -0.0), math.pi / 2.0, epsilon));
+    assert(math.approxEq(f32, atan2_32(-1.0, 0.0), -math.pi / 2.0, epsilon));
+    assert(math.approxEq(f32, atan2_32(-1.0, -0.0), -math.pi / 2.0, epsilon));
+    assert(math.approxEq(f32, atan2_32(math.inf(f32), math.inf(f32)), math.pi / 4.0, epsilon));
+    assert(math.approxEq(f32, atan2_32(-math.inf(f32), math.inf(f32)), -math.pi / 4.0, epsilon));
+    assert(math.approxEq(f32, atan2_32(math.inf(f32), -math.inf(f32)), 3.0 * math.pi / 4.0, epsilon));
+    assert(math.approxEq(f32, atan2_32(-math.inf(f32), -math.inf(f32)), -3.0 * math.pi / 4.0, epsilon));
     assert(atan2_32(1.0, math.inf(f32)) == 0.0);
     assert(math.approxEq(f32, atan2_32(1.0, -math.inf(f32)), math.pi, epsilon));
     assert(math.approxEq(f32, atan2_32(-1.0, -math.inf(f32)), -math.pi, epsilon));
-    assert(math.approxEq(f32, atan2_32(math.inf(f32), 1.0), math.pi_2, epsilon));
-    assert(math.approxEq(f32, atan2_32(-math.inf(f32), 1.0), -math.pi_2, epsilon));
+    assert(math.approxEq(f32, atan2_32(math.inf(f32), 1.0), math.pi / 2.0, epsilon));
+    assert(math.approxEq(f32, atan2_32(-math.inf(f32), 1.0), -math.pi / 2.0, epsilon));
 }
 
 test "math.atan2_64.special" {
@@ -269,17 +269,17 @@ test "math.atan2_64.special" {
     assert(atan2_64(-0.0, 5.0) == -0.0);
     assert(math.approxEq(f64, atan2_64(0.0, -5.0), math.pi, epsilon));
     assert(math.approxEq(f64, atan2_64(-0.0, -5.0), -math.pi, epsilon));
-    assert(math.approxEq(f64, atan2_64(1.0, 0.0), math.pi_2, epsilon));
-    assert(math.approxEq(f64, atan2_64(1.0, -0.0), math.pi_2, epsilon));
-    assert(math.approxEq(f64, atan2_64(-1.0, 0.0), -math.pi_2, epsilon));
-    assert(math.approxEq(f64, atan2_64(-1.0, -0.0), -math.pi_2, epsilon));
-    assert(math.approxEq(f64, atan2_64(math.inf(f64), math.inf(f64)), math.pi_4, epsilon));
-    assert(math.approxEq(f64, atan2_64(-math.inf(f64), math.inf(f64)), -math.pi_4, epsilon));
-    assert(math.approxEq(f64, atan2_64(math.inf(f64), -math.inf(f64)), 3.0 * math.pi_4, epsilon));
-    assert(math.approxEq(f64, atan2_64(-math.inf(f64), -math.inf(f64)), -3.0 * math.pi_4, epsilon));
+    assert(math.approxEq(f64, atan2_64(1.0, 0.0), math.pi / 2.0, epsilon));
+    assert(math.approxEq(f64, atan2_64(1.0, -0.0), math.pi / 2.0, epsilon));
+    assert(math.approxEq(f64, atan2_64(-1.0, 0.0), -math.pi / 2.0, epsilon));
+    assert(math.approxEq(f64, atan2_64(-1.0, -0.0), -math.pi / 2.0, epsilon));
+    assert(math.approxEq(f64, atan2_64(math.inf(f64), math.inf(f64)), math.pi / 4.0, epsilon));
+    assert(math.approxEq(f64, atan2_64(-math.inf(f64), math.inf(f64)), -math.pi / 4.0, epsilon));
+    assert(math.approxEq(f64, atan2_64(math.inf(f64), -math.inf(f64)), 3.0 * math.pi / 4.0, epsilon));
+    assert(math.approxEq(f64, atan2_64(-math.inf(f64), -math.inf(f64)), -3.0 * math.pi / 4.0, epsilon));
     assert(atan2_64(1.0, math.inf(f64)) == 0.0);
     assert(math.approxEq(f64, atan2_64(1.0, -math.inf(f64)), math.pi, epsilon));
     assert(math.approxEq(f64, atan2_64(-1.0, -math.inf(f64)), -math.pi, epsilon));
-    assert(math.approxEq(f64, atan2_64(math.inf(f64), 1.0), math.pi_2, epsilon));
-    assert(math.approxEq(f64, atan2_64(-math.inf(f64), 1.0), -math.pi_2, epsilon));
+    assert(math.approxEq(f64, atan2_64(math.inf(f64), 1.0), math.pi / 2.0, epsilon));
+    assert(math.approxEq(f64, atan2_64(-math.inf(f64), 1.0), -math.pi / 2.0, epsilon));
 }

@@ -2,19 +2,8 @@ const builtin = @import("builtin");
 const TypeId = builtin.TypeId;
 const assert = @import("../debug.zig").assert;
 
-pub const e         = 2.7182818284590452354;  // e
-pub const log2_e    = 1.4426950408889634074;  // log_2(e)
-pub const log10_e   = 0.43429448190325182765; // log_10(e)
-pub const ln_2      = 0.69314718055994530942; // log_e(2)
-pub const ln_10     = 2.30258509299404568402; // log_e(10)
-pub const pi        = 3.14159265358979323846; // pi
-pub const pi_2      = 1.57079632679489661923; // pi/2
-pub const pi_4      = 0.78539816339744830962; // pi/4
-pub const r1_pi     = 0.31830988618379067154; // 1/pi
-pub const r2_pi     = 0.63661977236758134308; // 2/pi
-pub const r2_sqrtpi = 1.12837916709551257390; // 2/sqrt(pi)
-pub const sqrt2     = 1.41421356237309504880; // sqrt(2)
-pub const r1_sqrt2  = 0.70710678118654752440; // 1/sqrt(2)
+pub const e = 2.71828182845904523536028747135266249775724709369995;
+pub const pi = 3.14159265358979323846264338327950288419716939937510;
 
 // float.h details
 pub const f64_true_min = 4.94065645841246544177e-324;

Commit be16034275

Commit `be16034275`