math: fix argument names in Atan2
(error introduced converting from arg1, arg2)
Fixes #220.
R=r
https://golang.org/cl/156041
diff --git a/src/pkg/math/atan2.go b/src/pkg/math/atan2.go
index 7165c53..26d3a1d 100644
--- a/src/pkg/math/atan2.go
+++ b/src/pkg/math/atan2.go
@@ -4,20 +4,19 @@
package math
-
-// Atan returns the arc tangent of y/x, using
+// Atan2 returns the arc tangent of y/x, using
// the signs of the two to determine the quadrant
// of the return value.
-func Atan2(x, y float64) float64 {
+func Atan2(y, x float64) float64 {
// Determine the quadrant and call atan.
- if x+y == x {
- if x >= 0 {
+ if y+x == y {
+ if y >= 0 {
return Pi / 2
}
return -Pi / 2;
}
- q := Atan(x / y);
- if y < 0 {
+ q := Atan(y / x);
+ if x < 0 {
if q <= 0 {
return q + Pi
}
