1 files changed, 26 insertions, 0 deletions

diff --git a/src/lib/src/matrix.c b/src/lib/src/matrix.c
index d5c3fcc..29511eb 100644
--- a/src/lib/src/matrix.c
+++ b/src/lib/src/matrix.c
@@ -189,6 +189,32 @@ void nnMatrixMulRows(
   }
 }
 
+void nnMatrixMulOuter(
+    const nnMatrix* left, const nnMatrix* right, nnMatrix* out) {
+  assert(left != 0);
+  assert(right != 0);
+  assert(out != 0);
+  assert(out != left);
+  assert(out != right);
+  assert((left->rows == 1) || (left->cols == 1));   // Vector.
+  assert((right->rows == 1) || (right->cols == 1)); // Vector.
+  const int N = left->rows * left->cols;
+  const int M = right->rows * right->cols;
+  assert((out->rows == N) && (out->cols == M));
+
+  const R* left_value = left->values;
+  R*       out_value  = out->values;
+
+  for (int i = 0; i < N; ++i) {
+    const R* right_value = right->values;
+    
+    for (int j = 0; j < M; ++j) {
+      *out_value++ = *left_value * *right_value++;
+    }
+    left_value++;
+  }
+}
+
 void nnMatrixMulAdd(
     const nnMatrix* left, const nnMatrix* right, R scale, nnMatrix* out) {
   assert(left);