1 files changed, 22 insertions, 0 deletions
diff --git a/src/math/log10.go b/src/math/log10.go
new file mode 100644
index 000000000..95cfbf47c
--- /dev/null
+++ b/src/math/log10.go
@@ -0,0 +1,22 @@
+// Copyright 2009 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
+
+// Log10 returns the decimal logarithm of x.
+// The special cases are the same as for Log.
+func Log10(x float64) float64
+
+func log10(x float64) float64 {
+	return Log(x) * (1 / Ln10)
+}
+
+// Log2 returns the binary logarithm of x.
+// The special cases are the same as for Log.
+func Log2(x float64) float64
+
+func log2(x float64) float64 {
+	frac, exp := Frexp(x)
+	return Log(frac)*(1/Ln2) + float64(exp)
+}