Sync public subset from Flux (private)

include/numerics/abs.h

@@ -0,0 +1,23 @@
+#pragma once
+
+
+#include "./utils/vector.h"
+#include "./utils/matrix.h"
+
+
+namespace numerics{
+	
+	template <typename T>
+	T abs(const T a){
+
+		if(a < 0){
+			return -a;
+		}else{
+			return a;
+		}
+	}
+
+
+
+} // namespace numerics
+