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Diffstat (limited to 'src/pkg/math/hypot.go')
-rw-r--r-- | src/pkg/math/hypot.go | 43 |
1 files changed, 0 insertions, 43 deletions
diff --git a/src/pkg/math/hypot.go b/src/pkg/math/hypot.go deleted file mode 100644 index 2087cb05b..000000000 --- a/src/pkg/math/hypot.go +++ /dev/null @@ -1,43 +0,0 @@ -// Copyright 2010 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package math - -/* - Hypot -- sqrt(p*p + q*q), but overflows only if the result does. -*/ - -// Hypot returns Sqrt(p*p + q*q), taking care to avoid -// unnecessary overflow and underflow. -// -// Special cases are: -// Hypot(±Inf, q) = +Inf -// Hypot(p, ±Inf) = +Inf -// Hypot(NaN, q) = NaN -// Hypot(p, NaN) = NaN -func Hypot(p, q float64) float64 - -func hypot(p, q float64) float64 { - // special cases - switch { - case IsInf(p, 0) || IsInf(q, 0): - return Inf(1) - case IsNaN(p) || IsNaN(q): - return NaN() - } - if p < 0 { - p = -p - } - if q < 0 { - q = -q - } - if p < q { - p, q = q, p - } - if p == 0 { - return 0 - } - q = q / p - return p * Sqrt(1+q*q) -} |