From 985bce8af2c75e02ec28c4a7aa9b092cdd83a094 Mon Sep 17 00:00:00 2001
From: Vladimir Chalupecky <vladimir.chalupecky@gmail.com>
Date: Fri, 16 Jun 2017 22:37:47 +0200
Subject: [PATCH] optimize/functions: use ++ and -- operators

---
 optimize/functions/functions.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/optimize/functions/functions.go b/optimize/functions/functions.go
index 37675592..43a4c948 100644
--- a/optimize/functions/functions.go
+++ b/optimize/functions/functions.go
@@ -1766,11 +1766,11 @@ func (f Plassmann) Grad(grad, x []float64) {
 	grad[0] = (1 - b) * math.Cos(l*math.Pi/2*a)
 	switch {
 	case a <= 1-b:
-		grad[0] -= 1
+		grad[0]--
 	case 1-b < a && a <= 1+b:
 		grad[0] += (a - 1) / b
 	default: // a > 1+b
-		grad[0] += 1
+		grad[0]++
 	}
 }