ready for parralization

include/numerics/matmul.h

@@ -0,0 +1,42 @@
+#ifndef _matmul_n_
+#define _matmul_n_
+
+
+#include "./utils/matrix.h"
+
+
+namespace numerics{
+	
+	template <typename T>
+	utils::Matrix<T> matmul(const utils::Matrix<T>& A, const utils::Matrix<T>& B){
+
+		if(A.cols() != B.rows()){
+			throw std::runtime_error("matmul: dimension mismatch");
+		}
+
+		const uint64_t m = A.rows();
+		const uint64_t n = A.cols(); // also B.rows()
+		const uint64_t p = B.cols();
+		T tmp;
+
+		utils::Matrix<T> C(m, n, T{0});
+
+		//#pragma omp parallel for collapse(2) schedule(static)
+		#pragma omp parallel for
+		for (uint64_t i = 0; i < m; ++i){
+			for (uint64_t j = 0; j < n; ++j){
+				tmp = A(i,j);
+				for (uint64_t k = 0; k < p; ++k){
+					C(i,k) += tmp * B(j,k);
+				}
+			}
+		}
+		return C;
+	}
+
+
+
+
+} // namespace numerics
+
+#endif // _matmul_n_