NNFS p.135

Started on the iteration, not need to rewrite matadd.h and need to make matrandom.h.

include/numerics/vecmean.h

@@ -22,6 +22,44 @@ namespace numerics{
 	    return mean;
 	}
 
+	template <typename T>
+	T vecmean_isequal(utils::Vector<T>& a, utils::Vector<T>& b, T tol=1e-12) {
+
+		uint64_t count = T{0};
+
+		const uint64_t N = a.size();
+
+		if (a.size() != b.size()){
+			throw std::runtime_error("vecmean_equal: dimension mismatch");
+		}
+
+
+	    for (uint64_t i = 0; i < N; ++i) {
+	    	if ((a[i]-b[i]) < tol){
+	    		count += 1;
+	    	}
+	    }
+	    return static_cast<T>(count)/static_cast<T>(N);
+	}
+	template <typename Td, typename Ti>
+	Td vecmean_equal(utils::Vector<Ti>& a, utils::Vector<Ti>& b) {
+
+		Ti count = Ti{0};
+
+		const uint64_t N = a.size();
+
+		if (a.size() != b.size()){
+			throw std::runtime_error("vecmean_equal: dimension mismatch");
+		}
+
+
+	    for (uint64_t i = 0; i < N; ++i) {
+	    	if (a[i]==b[i]){
+	    		count += Ti{1};
+	    	}
+	    }
+	    return static_cast<Td>(count)/static_cast<Td>(N);
+	}
 
 } // namespace numerics