Started Loss, done softmax, up to p.125

I've implemented alot of support functions that needs to be refactored, optimised and tested; mean.h, exponential.h, matdiv.h matsum.h matsubtract.h. Maybe we need to have a look at if matdiv/matmul should be in the same. Same with matadd/matsubtract and if some of it should be in matvec.h.

include/numerics/max.h

@@ -39,13 +39,37 @@ namespace numerics{
 	utils::Matrix<T> max(const utils::Matrix<T>& A, const T b){
 
 		utils::Matrix<T> B = A;
-
 		inplace_max(B, b);
-		
-
 		return B;
 	}
 
+	template <typename T>
+	utils::Vector<T> max(const utils::Matrix<T>& A, std::string method){
+
+		utils::Vector<T> b;
+
+		if (method == "cols"){
+			b.resize(A.cols(), T{0});
+			for (uint64_t i = 0; i < A.cols(); ++i){
+				for (uint64_t j = 0; j < A.rows(); ++j){
+					b[i] = max(A(j, i), b[i]);
+				}
+			}
+		}else if (method == "rows"){
+			b.resize(A.rows(), T{0});
+			for (uint64_t i = 0; i < A.rows(); ++i){
+				for (uint64_t j = 0; j < A.cols(); ++j){
+					//std::cout << i << ":" << j << std::endl;
+					b[i] = max(A(i, j), b[i]);
+				}
+			}
+		}else{
+			throw std::runtime_error("max: choose 'rows or 'cols'");
+		}
+		return b;
+
+	}
+
 
 
 } // namespace numerics