diff options
Diffstat (limited to 'libgo/go/math/rand/rand.go')
| -rw-r--r-- | libgo/go/math/rand/rand.go | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/libgo/go/math/rand/rand.go b/libgo/go/math/rand/rand.go index 2157cdb4658..d3ea8401781 100644 --- a/libgo/go/math/rand/rand.go +++ b/libgo/go/math/rand/rand.go @@ -95,20 +95,18 @@ func (r *Rand) Intn(n int) int { } // Float64 returns, as a float64, a pseudo-random number in [0.0,1.0). -func (r *Rand) Float64() float64 { return float64(r.Int63()) / (1 << 63) } +func (r *Rand) Float64() float64 { return float64(r.Int63n(1<<53)) / (1 << 53) } // Float32 returns, as a float32, a pseudo-random number in [0.0,1.0). -func (r *Rand) Float32() float32 { return float32(r.Float64()) } +func (r *Rand) Float32() float32 { return float32(r.Int31n(1<<24)) / (1 << 24) } // Perm returns, as a slice of n ints, a pseudo-random permutation of the integers [0,n). func (r *Rand) Perm(n int) []int { m := make([]int, n) for i := 0; i < n; i++ { - m[i] = i - } - for i := 0; i < n; i++ { j := r.Intn(i + 1) - m[i], m[j] = m[j], m[i] + m[i] = m[j] + m[j] = i } return m } |