diff --git a/examples/src/main/kotlin/scientifik/kmath/structures/VictorTest.kt b/examples/src/main/kotlin/scientifik/kmath/structures/VictorTest.kt
index da0c193ad..8d710c584 100644
--- a/examples/src/main/kotlin/scientifik/kmath/structures/VictorTest.kt
+++ b/examples/src/main/kotlin/scientifik/kmath/structures/VictorTest.kt
@@ -13,6 +13,12 @@ fun main() {
 
     val viktorField = ViktorNDField(intArrayOf(dim, dim))
 
+    autoField.run {
+        var res = one
+        repeat(n/2) {
+            res += 1.0
+        }
+    }
 
     measureAndPrint("Automatic field addition") {
         autoField.run {
@@ -23,6 +29,22 @@ fun main() {
         }
     }
 
+    viktorField.run {
+        var res = one
+        repeat(n/2) {
+            res += one
+        }
+    }
+
+    measureAndPrint("Viktor field addition") {
+        viktorField.run {
+            var res = one
+            repeat(n) {
+                res += one
+            }
+        }
+    }
+
     measureAndPrint("Raw Viktor") {
         val one = F64Array.full(init = 1.0, shape = *intArrayOf(dim, dim))
         var res = one
@@ -30,13 +52,4 @@ fun main() {
             res = res + one
         }
     }
-
-    measureAndPrint("Viktor field addition") {
-        viktorField.run {
-            var res = one
-            repeat(n) {
-                res += 1.0
-            }
-        }
-    }
 }
\ No newline at end of file
diff --git a/kmath-viktor/src/main/kotlin/scientifik/kmath/viktor/ViktorNDStructure.kt b/kmath-viktor/src/main/kotlin/scientifik/kmath/viktor/ViktorNDStructure.kt
index b572485ff..b8cf688f4 100644
--- a/kmath-viktor/src/main/kotlin/scientifik/kmath/viktor/ViktorNDStructure.kt
+++ b/kmath-viktor/src/main/kotlin/scientifik/kmath/viktor/ViktorNDStructure.kt
@@ -65,9 +65,15 @@ class ViktorNDField(override val shape: IntArray) : NDField<Double, RealField, V
         }
     }.asStructure()
 
-    override fun ViktorNDStructure.plus(b: ViktorNDStructure): ViktorNDStructure =
-        (f64Buffer + b.f64Buffer).asStructure()
+    override fun add(a: ViktorNDStructure, b: ViktorNDStructure): ViktorNDStructure {
+        return (a.f64Buffer + b.f64Buffer).asStructure()
+    }
 
-    override fun ViktorNDStructure.minus(b: ViktorNDStructure): ViktorNDStructure =
-        (f64Buffer - b.f64Buffer).asStructure()
+//    override inline fun ViktorNDStructure.plus(b: ViktorNDStructure): ViktorNDStructure {
+//        return (f64Buffer + b.f64Buffer).asStructure()
+//    }
+
+    override fun multiply(a: ViktorNDStructure, k: Number): ViktorNDStructure {
+        return (a.f64Buffer * k.toDouble()).asStructure()
+    }
 }
\ No newline at end of file