diff --git a/src/quaternion.h b/src/quaternion.h
index b818083..2dc9006 100644
--- a/src/quaternion.h
+++ b/src/quaternion.h
@@ -204,7 +204,7 @@ static inline void dp_quaternion_subtract(const DPQuaternion * minuend, const DP
     result->x3 = minuend->x3 - subtrahend->x3;
 }
 
-// ================ Combination ================= //
+// =============== Multiplication =============== //
 
 static inline void sp_quaternion_multiply(const SPQuaternion* left, const SPQuaternion* right, SPQuaternion* result)
 {
diff --git a/src/vector2.h b/src/vector2.h
index ee59b9e..ae380e4 100644
--- a/src/vector2.h
+++ b/src/vector2.h
@@ -204,104 +204,18 @@ static inline void dp_vector2_divide(const DPVector2* dividend, const double div
     result->x2 = dividend->x2 / divisor;
 }
 
-// ============= Weighed Sum of two ============= //
+// ================ Append scaled =============== //
 
-static inline void sp_vector2_get_weighted_sum2(
-    const float weight1, const SPVector2* vector1,
-    const float weight2, const SPVector2* vector2,
-    SPVector2* result
-)
+static inline void sp_vector2_append_scaled(SPVector2* basic_vector, const SPVector2* scalable_summand, const float scale)
 {
-    result->x1 = vector1->x1 * weight1 + vector2->x1 * weight2;
-    result->x2 = vector1->x2 * weight1 + vector2->x2 * weight2;
+    basic_vector->x1 += scalable_summand->x1 * scale;
+    basic_vector->x2 += scalable_summand->x2 * scale;
 }
 
-static inline void dp_vector2_get_weighted_sum2(
-    const double weight1, const DPVector2* vector1,
-    const double weight2, const DPVector2* vector2,
-    DPVector2* result
-)
+static inline void dp_vector2_append_scaled(DPVector2* basic_vector, const DPVector2* scalable_summand, const double scale)
 {
-    result->x1 = vector1->x1 * weight1 + vector2->x1 * weight2;
-    result->x2 = vector1->x2 * weight1 + vector2->x2 * weight2;
-}
-
-// ============ Weighed Sum of three ============ //
-
-static inline void sp_vector2_get_weighted_sum3(
-    const float weight1, const SPVector2* vector1,
-    const float weight2, const SPVector2* vector2,
-    const float weight3, const SPVector2* vector3,
-    SPVector2* result
-)
-{
-    result->x1 = vector1->x1 * weight1 + vector2->x1 * weight2 + vector3->x1 * weight3;
-    result->x2 = vector1->x2 * weight1 + vector2->x2 * weight2 + vector3->x2 * weight3;
-}
-
-static inline void dp_vector2_get_weighted_sum3(
-    const double weight1, const DPVector2* vector1,
-    const double weight2, const DPVector2* vector2,
-    const double weight3, const DPVector2* vector3,
-    DPVector2* result
-)
-{
-    result->x1 = vector1->x1 * weight1 + vector2->x1 * weight2 + vector3->x1 * weight3;
-    result->x2 = vector1->x2 * weight1 + vector2->x2 * weight2 + vector3->x2 * weight3;
-}
-
-// ============ Weighed Sum of four ============= //
-
-static inline void sp_vector2_get_weighted_sum4(
-    const float weight1, const SPVector2* vector1,
-    const float weight2, const SPVector2* vector2,
-    const float weight3, const SPVector2* vector3,
-    const float weight4, const SPVector2* vector4,
-    SPVector2* result
-)
-{
-    result->x1 = (vector1->x1 * weight1 + vector2->x1 * weight2) + (vector3->x1 * weight3 + vector4->x1 * weight4);
-    result->x2 = (vector1->x2 * weight1 + vector2->x2 * weight2) + (vector3->x2 * weight3 + vector4->x2 * weight4);
-}
-
-static inline void dp_vector2_get_weighted_sum4(
-    const double weight1, const DPVector2* vector1,
-    const double weight2, const DPVector2* vector2,
-    const double weight3, const DPVector2* vector3,
-    const double weight4, const DPVector2* vector4,
-    DPVector2* result
-)
-{
-    result->x1 = (vector1->x1 * weight1 + vector2->x1 * weight2) + (vector3->x1 * weight3 + vector4->x1 * weight4);
-    result->x2 = (vector1->x2 * weight1 + vector2->x2 * weight2) + (vector3->x2 * weight3 + vector4->x2 * weight4);
-}
-
-// ============ Weighed Sum of five ============= //
-
-static inline void sp_vector2_get_weighted_sum5(
-    const float weight1, const SPVector2* vector1,
-    const float weight2, const SPVector2* vector2,
-    const float weight3, const SPVector2* vector3,
-    const float weight4, const SPVector2* vector4,
-    const float weight5, const SPVector2* vector5,
-    SPVector2* result
-)
-{
-    result->x1 = (vector1->x1 * weight1 + vector2->x1 * weight2) + (vector3->x1 * weight3 + vector4->x1 * weight4) + vector5->x1 * weight5;
-    result->x2 = (vector1->x2 * weight1 + vector2->x2 * weight2) + (vector3->x2 * weight3 + vector4->x2 * weight4) + vector5->x2 * weight5;
-}
-
-static inline void dp_vector2_get_weighted_sum5(
-    const double weight1, const DPVector2* vector1,
-    const double weight2, const DPVector2* vector2,
-    const double weight3, const DPVector2* vector3,
-    const double weight4, const DPVector2* vector4,
-    const double weight5, const DPVector2* vector5,
-    DPVector2* result
-)
-{
-    result->x1 = (vector1->x1 * weight1 + vector2->x1 * weight2) + (vector3->x1 * weight3 + vector4->x1 * weight4) + vector5->x1 * weight5;
-    result->x2 = (vector1->x2 * weight1 + vector2->x2 * weight2) + (vector3->x2 * weight3 + vector4->x2 * weight4) + vector5->x2 * weight5;
+    basic_vector->x1 += scalable_summand->x1 * scale;
+    basic_vector->x2 += scalable_summand->x2 * scale;
 }
 
 // ================== Average2 ================== //
@@ -320,82 +234,18 @@ static inline void dp_vector2_get_mean2(const DPVector2* vector1, const DPVector
 
 // ================== Average3 ================== //
 
-static inline void sp_vector2_get_mean3(
-    const SPVector2* vector1,
-    const SPVector2* vector2,
-    const SPVector2* vector3,
-    SPVector2* result
-)
+static inline void sp_vector2_get_mean3(const SPVector2* vector1, const SPVector2* vector2, const SPVector2* vector3, SPVector2* result)
 {
     result->x1 = (vector1->x1 + vector2->x1 + vector3->x1) * SP_ONE_THIRD;
     result->x2 = (vector1->x2 + vector2->x2 + vector3->x2) * SP_ONE_THIRD;
 }
 
-static inline void dp_vector2_get_mean3(
-    const DPVector2* vector1,
-    const DPVector2* vector2,
-    const DPVector2* vector3,
-    DPVector2* result
-)
+static inline void dp_vector2_get_mean3(const DPVector2* vector1, const DPVector2* vector2, const DPVector2* vector3, DPVector2* result)
 {
     result->x1 = (vector1->x1 + vector2->x1 + vector3->x1) * DP_ONE_THIRD;
     result->x2 = (vector1->x2 + vector2->x2 + vector3->x2) * DP_ONE_THIRD;
 }
 
-// ================== Average4 ================== //
-
-static inline void sp_vector2_get_mean4(
-    const SPVector2* vector1,
-    const SPVector2* vector2,
-    const SPVector2* vector3,
-    const SPVector2* vector4,
-    SPVector2* result
-)
-{
-    result->x1 = ((vector1->x1 + vector2->x1) + (vector3->x1 + vector4->x1)) * 0.25f;
-    result->x2 = ((vector1->x2 + vector2->x2) + (vector3->x2 + vector4->x2)) * 0.25f;
-}
-
-static inline void dp_vector2_get_mean4(
-    const DPVector2* vector1,
-    const DPVector2* vector2,
-    const DPVector2* vector3,
-    const DPVector2* vector4,
-    DPVector2* result
-)
-{
-    result->x1 = ((vector1->x1 + vector2->x1) + (vector3->x1 + vector4->x1)) * 0.25;
-    result->x2 = ((vector1->x2 + vector2->x2) + (vector3->x2 + vector4->x2)) * 0.25;
-}
-
-// ================== Average5 ================== //
-
-static inline void sp_vector2_get_mean5(
-    const SPVector2* vector1,
-    const SPVector2* vector2,
-    const SPVector2* vector3,
-    const SPVector2* vector4,
-    const SPVector2* vector5,
-    SPVector2* result
-)
-{
-    result->x1 = ((vector1->x1 + vector2->x1) + (vector3->x1 + vector4->x1) + vector5->x1) * 0.2f;
-    result->x2 = ((vector1->x2 + vector2->x2) + (vector3->x2 + vector4->x2) + vector5->x2) * 0.2f;
-}
-
-static inline void dp_vector2_get_mean5(
-    const DPVector2* vector1,
-    const DPVector2* vector2,
-    const DPVector2* vector3,
-    const DPVector2* vector4,
-    const DPVector2* vector5,
-    DPVector2* result
-)
-{
-    result->x1 = ((vector1->x1 + vector2->x1) + (vector3->x1 + vector4->x1) + vector5->x1) * 0.2;
-    result->x2 = ((vector1->x2 + vector2->x2) + (vector3->x2 + vector4->x2) + vector5->x2) * 0.2;
-}
-
 // =============== Scalar Product =============== //
 
 static inline float sp_vector2_scalar(const SPVector2* vector1, const SPVector2* vector2)
diff --git a/src/vector3.h b/src/vector3.h
index dff9a4f..49c02e6 100644
--- a/src/vector3.h
+++ b/src/vector3.h
@@ -226,112 +226,20 @@ static inline void dp_vector3_divide(const DPVector3* dividend, const double div
     result->x3 = dividend->x3 / divisor;
 }
 
-// ============= Weighed Sum of two ============= //
+// ================ Append scaled =============== //
 
-static inline void sp_vector3_get_weighted_sum2(
-    const float weight1, const SPVector3* vector1,
-    const float weight2, const SPVector3* vector2,
-    SPVector3* result
-)
+static inline void sp_vector3_append_scaled(SPVector3* basic_vector, const SPVector3* scalable_summand, const float scale)
 {
-    result->x1 = vector1->x1 * weight1 + vector2->x1 * weight2;
-    result->x2 = vector1->x2 * weight1 + vector2->x2 * weight2;
-    result->x3 = vector1->x3 * weight1 + vector2->x3 * weight2;
+    basic_vector->x1 += scalable_summand->x1 * scale;
+    basic_vector->x2 += scalable_summand->x2 * scale;
+    basic_vector->x3 += scalable_summand->x3 * scale;
 }
 
-static inline void dp_vector3_get_weighted_sum2(
-    const double weight1, const DPVector3* vector1,
-    const double weight2, const DPVector3* vector2,
-    DPVector3* result
-)
+static inline void dp_vector3_append_scaled(DPVector3* basic_vector, const DPVector3* scalable_summand, const double scale)
 {
-    result->x1 = vector1->x1 * weight1 + vector2->x1 * weight2;
-    result->x2 = vector1->x2 * weight1 + vector2->x2 * weight2;
-    result->x3 = vector1->x3 * weight1 + vector2->x3 * weight2;
-}
-
-// ============ Weighed Sum of three ============ //
-
-static inline void sp_vector3_get_weighted_sum3(
-    const float weight1, const SPVector3* vector1,
-    const float weight2, const SPVector3* vector2,
-    const float weight3, const SPVector3* vector3,
-    SPVector3* result
-)
-{
-    result->x1 = vector1->x1 * weight1 + vector2->x1 * weight2 + vector3->x1 * weight3;
-    result->x2 = vector1->x2 * weight1 + vector2->x2 * weight2 + vector3->x2 * weight3;
-    result->x3 = vector1->x3 * weight1 + vector2->x3 * weight2 + vector3->x3 * weight3;
-}
-
-static inline void dp_vector3_get_weighted_sum3(
-    const double weight1, const DPVector3* vector1,
-    const double weight2, const DPVector3* vector2,
-    const double weight3, const DPVector3* vector3,
-    DPVector3* result
-)
-{
-    result->x1 = vector1->x1 * weight1 + vector2->x1 * weight2 + vector3->x1 * weight3;
-    result->x2 = vector1->x2 * weight1 + vector2->x2 * weight2 + vector3->x2 * weight3;
-    result->x3 = vector1->x3 * weight1 + vector2->x3 * weight2 + vector3->x3 * weight3;
-}
-
-// ============ Weighed Sum of four ============= //
-
-static inline void sp_vector3_get_weighted_sum4(
-    const float weight1, const SPVector3* vector1,
-    const float weight2, const SPVector3* vector2,
-    const float weight3, const SPVector3* vector3,
-    const float weight4, const SPVector3* vector4,
-    SPVector3* result
-)
-{
-    result->x1 = (vector1->x1 * weight1 + vector2->x1 * weight2) + (vector3->x1 * weight3 + vector4->x1 * weight4);
-    result->x2 = (vector1->x2 * weight1 + vector2->x2 * weight2) + (vector3->x2 * weight3 + vector4->x2 * weight4);
-    result->x3 = (vector1->x3 * weight1 + vector2->x3 * weight2) + (vector3->x3 * weight3 + vector4->x3 * weight4);
-}
-
-static inline void dp_vector3_get_weighted_sum4(
-    const double weight1, const DPVector3* vector1,
-    const double weight2, const DPVector3* vector2,
-    const double weight3, const DPVector3* vector3,
-    const double weight4, const DPVector3* vector4,
-    DPVector3* result
-)
-{
-    result->x1 = (vector1->x1 * weight1 + vector2->x1 * weight2) + (vector3->x1 * weight3 + vector4->x1 * weight4);
-    result->x2 = (vector1->x2 * weight1 + vector2->x2 * weight2) + (vector3->x2 * weight3 + vector4->x2 * weight4);
-    result->x3 = (vector1->x3 * weight1 + vector2->x3 * weight2) + (vector3->x3 * weight3 + vector4->x3 * weight4);
-}
-
-// ============ Weighed Sum of five ============= //
-
-static inline void sp_vector3_get_weighted_sum5(
-    const float weight1, const SPVector3* vector1,
-    const float weight2, const SPVector3* vector2,
-    const float weight3, const SPVector3* vector3,
-    const float weight4, const SPVector3* vector4,
-    const float weight5, const SPVector3* vector5,
-    SPVector3* result
-)
-{
-    result->x1 = (vector1->x1 * weight1 + vector2->x1 * weight2) + (vector3->x1 * weight3 + vector4->x1 * weight4) + vector5->x1 * weight5;
-    result->x2 = (vector1->x2 * weight1 + vector2->x2 * weight2) + (vector3->x2 * weight3 + vector4->x2 * weight4) + vector5->x2 * weight5;
-    result->x3 = (vector1->x3 * weight1 + vector2->x3 * weight2) + (vector3->x3 * weight3 + vector4->x3 * weight4) + vector5->x3 * weight5;
-}
-
-static inline void dp_vector3_get_weighted_sum5(
-    const double weight1, const DPVector3* vector1,
-    const double weight2, const DPVector3* vector2,
-    const double weight3, const DPVector3* vector3,
-    const double weight4, const DPVector3* vector4,
-    const double weight5, const DPVector3* vector5,
-    DPVector3* result
-)
-{
-    result->x1 = (vector1->x1 * weight1 + vector2->x1 * weight2) + (vector3->x1 * weight3 + vector4->x1 * weight4) + vector5->x1 * weight5;
-    result->x2 = (vector1->x2 * weight1 + vector2->x2 * weight2) + (vector3->x2 * weight3 + vector4->x2 * weight4) + vector5->x2 * weight5;
-    result->x3 = (vector1->x3 * weight1 + vector2->x3 * weight2) + (vector3->x3 * weight3 + vector4->x3 * weight4) + vector5->x3 * weight5;
+    basic_vector->x1 += scalable_summand->x1 * scale;
+    basic_vector->x2 += scalable_summand->x2 * scale;
+    basic_vector->x3 += scalable_summand->x3 * scale;
 }
 
 // ================== Average2 ================== //
@@ -352,88 +260,20 @@ static inline void dp_vector3_get_mean2(const DPVector3* vector1, const DPVector
 
 // ================== Average3 ================== //
 
-static inline void sp_vector3_get_mean3(
-    const SPVector3* vector1,
-    const SPVector3* vector2,
-    const SPVector3* vector3,
-    SPVector3* result
-)
+static inline void sp_vector3_get_mean3(const SPVector3* vector1, const SPVector3* vector2, const SPVector3* vector3, SPVector3* result)
 {
     result->x1 = (vector1->x1 + vector2->x1 + vector3->x1) * SP_ONE_THIRD;
     result->x2 = (vector1->x2 + vector2->x2 + vector3->x2) * SP_ONE_THIRD;
     result->x3 = (vector1->x3 + vector2->x3 + vector3->x3) * SP_ONE_THIRD;
 }
 
-static inline void dp_vector3_get_mean3(
-    const DPVector3* vector1,
-    const DPVector3* vector2,
-    const DPVector3* vector3,
-    DPVector3* result
-)
+static inline void dp_vector3_get_mean3(const DPVector3* vector1, const DPVector3* vector2, const DPVector3* vector3, DPVector3* result)
 {
     result->x1 = (vector1->x1 + vector2->x1 + vector3->x1) * DP_ONE_THIRD;
     result->x2 = (vector1->x2 + vector2->x2 + vector3->x2) * DP_ONE_THIRD;
     result->x3 = (vector1->x3 + vector2->x3 + vector3->x3) * DP_ONE_THIRD;
 }
 
-// ================== Average4 ================== //
-
-static inline void sp_vector3_get_mean4(
-    const SPVector3* vector1,
-    const SPVector3* vector2,
-    const SPVector3* vector3,
-    const SPVector3* vector4,
-    SPVector3* result
-)
-{
-    result->x1 = ((vector1->x1 + vector2->x1) + (vector3->x1 + vector4->x1)) * 0.25f;
-    result->x2 = ((vector1->x2 + vector2->x2) + (vector3->x2 + vector4->x2)) * 0.25f;
-    result->x3 = ((vector1->x3 + vector2->x3) + (vector3->x3 + vector4->x3)) * 0.25f;
-}
-
-static inline void dp_vector3_get_mean4(
-    const DPVector3* vector1,
-    const DPVector3* vector2,
-    const DPVector3* vector3,
-    const DPVector3* vector4,
-    DPVector3* result
-)
-{
-    result->x1 = ((vector1->x1 + vector2->x1) + (vector3->x1 + vector4->x1)) * 0.25;
-    result->x2 = ((vector1->x2 + vector2->x2) + (vector3->x2 + vector4->x2)) * 0.25;
-    result->x3 = ((vector1->x3 + vector2->x3) + (vector3->x3 + vector4->x3)) * 0.25;
-}
-
-// ================== Average5 ================== //
-
-static inline void sp_vector3_get_mean5(
-    const SPVector3* vector1,
-    const SPVector3* vector2,
-    const SPVector3* vector3,
-    const SPVector3* vector4,
-    const SPVector3* vector5,
-    SPVector3* result
-)
-{
-    result->x1 = ((vector1->x1 + vector2->x1) + (vector3->x1 + vector4->x1) + vector5->x1) * 0.2f;
-    result->x2 = ((vector1->x2 + vector2->x2) + (vector3->x2 + vector4->x2) + vector5->x2) * 0.2f;
-    result->x3 = ((vector1->x3 + vector2->x3) + (vector3->x3 + vector4->x3) + vector5->x3) * 0.2f;
-}
-
-static inline void dp_vector3_get_mean5(
-    const DPVector3* vector1,
-    const DPVector3* vector2,
-    const DPVector3* vector3,
-    const DPVector3* vector4,
-    const DPVector3* vector5,
-    DPVector3* result
-)
-{
-    result->x1 = ((vector1->x1 + vector2->x1) + (vector3->x1 + vector4->x1) + vector5->x1) * 0.2;
-    result->x2 = ((vector1->x2 + vector2->x2) + (vector3->x2 + vector4->x2) + vector5->x2) * 0.2;
-    result->x3 = ((vector1->x3 + vector2->x3) + (vector3->x3 + vector4->x3) + vector5->x3) * 0.2;
-}
-
 // =============== Scalar Product =============== //
 
 static inline float sp_vector3_scalar(const SPVector3* vector1, const SPVector3* vector2)
diff --git a/src/versor.h b/src/versor.h
index 1130c14..d052f5a 100644
--- a/src/versor.h
+++ b/src/versor.h
@@ -147,7 +147,7 @@ static inline void dp_versor_set(const double s0, const double x1, const double
         return;
     }
 
-    __sp_versor_normalize(square_module, result);
+    __dp_versor_normalize(square_module, result);
 }
 
 // ==================== Copy ==================== //