math: doc
R=r
DELTA=173 (74 added, 14 deleted, 85 changed)
OCL=25753
CL=25767
diff --git a/src/lib/math/sinh.go b/src/lib/math/sinh.go
index e79e816..ef70989 100644
--- a/src/lib/math/sinh.go
+++ b/src/lib/math/sinh.go
@@ -7,19 +7,19 @@
import "math"
/*
- * sinh(arg) returns the hyperbolic sine of its floating-
- * point argument.
+ * Sinh(x) returns the hyperbolic sine of x
*
* The exponential func is called for arguments
* greater in magnitude than 0.5.
*
* A series is used for arguments smaller in magnitude than 0.5.
*
- * cosh(arg) is computed from the exponential func for
+ * Cosh(x) is computed from the exponential func for
* all arguments.
*/
-func Sinh(arg float64) float64 {
+// Sinh returns the hyperbolic sine of x.
+func Sinh(x float64) float64 {
// The coefficients are #2029 from Hart & Cheney. (20.36D)
const
(
@@ -32,23 +32,23 @@
Q2 = -0.173678953558233699533450911e+3;
)
- sign := false;
- if arg < 0 {
- arg = -arg;
+ sign := false;
+ if x < 0 {
+ x = -x;
sign = true;
}
var temp float64;
switch true {
- case arg > 21:
- temp = Exp(arg)/2;
+ case x > 21:
+ temp = Exp(x)/2;
- case arg > 0.5:
- temp = (Exp(arg) - Exp(-arg))/2;
+ case x > 0.5:
+ temp = (Exp(x) - Exp(-x))/2;
default:
- sq := arg*arg;
- temp = (((P3*sq+P2)*sq+P1)*sq+P0)*arg;
+ sq := x*x;
+ temp = (((P3*sq+P2)*sq+P1)*sq+P0)*x;
temp = temp/(((sq+Q2)*sq+Q1)*sq+Q0);
}
@@ -58,12 +58,13 @@
return temp;
}
-func Cosh(arg float64) float64 {
- if arg < 0 {
- arg = - arg;
+// Cosh returns the hyperbolic cosine of x.
+func Cosh(x float64) float64 {
+ if x < 0 {
+ x = - x;
}
- if arg > 21 {
- return Exp(arg)/2;
+ if x > 21 {
+ return Exp(x)/2;
}
- return (Exp(arg) + Exp(-arg))/2;
+ return (Exp(x) + Exp(-x))/2;
}
