From 6558d0d2f6dc80c1e2b077f0399c727b3475c8da Mon Sep 17 00:00:00 2001
From: Relintai <relintai@protonmail.com>
Date: Sun, 30 Apr 2023 16:28:40 +0200
Subject: [PATCH] Added create_gaussian_noise static helper method to Matrix.

---
 mlpp/lin_alg/mlpp_matrix.cpp | 19 +++++++++++++++++++
 mlpp/lin_alg/mlpp_matrix.h   |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/mlpp/lin_alg/mlpp_matrix.cpp b/mlpp/lin_alg/mlpp_matrix.cpp
index 2aa0d2f..fcc4941 100644
--- a/mlpp/lin_alg/mlpp_matrix.cpp
+++ b/mlpp/lin_alg/mlpp_matrix.cpp
@@ -605,6 +605,25 @@ void MLPPMatrix::gaussian_noise_fill() {
 	}
 }
 
+Ref<MLPPMatrix> MLPPMatrix::create_gaussian_noise(int n, int m) {
+	std::random_device rd;
+	std::default_random_engine generator(rd());
+	std::normal_distribution<real_t> distribution(0, 1); // Standard normal distribution. Mean of 0, std of 1.
+
+	Ref<MLPPMatrix> A;
+	A.instance();
+	A->resize(Size2i(m, n));
+
+	int a_data_size = A->data_size();
+	real_t *a_ptr = A->ptrw();
+
+	for (int i = 0; i < a_data_size; ++i) {
+		a_ptr[i] = distribution(generator);
+	}
+
+	return A;
+}
+
 void MLPPMatrix::add(const Ref<MLPPMatrix> &B) {
 	ERR_FAIL_COND(!B.is_valid());
 	ERR_FAIL_COND(_size != B->size());
diff --git a/mlpp/lin_alg/mlpp_matrix.h b/mlpp/lin_alg/mlpp_matrix.h
index 378cd68..3449f09 100644
--- a/mlpp/lin_alg/mlpp_matrix.h
+++ b/mlpp/lin_alg/mlpp_matrix.h
@@ -128,6 +128,8 @@ public:
 	Ref<MLPPMatrix> gaussian_noise(int n, int m) const;
 	void gaussian_noise_fill();
 
+	static Ref<MLPPMatrix> create_gaussian_noise(int n, int m);
+
 	void add(const Ref<MLPPMatrix> &B);
 	Ref<MLPPMatrix> addn(const Ref<MLPPMatrix> &B) const;
 	void addb(const Ref<MLPPMatrix> &A, const Ref<MLPPMatrix> &B);