1 files changed, 23 insertions, 0 deletions
diff --git a/nerv/lib/matrix/generic/mmatrix.c b/nerv/lib/matrix/generic/mmatrix.c
index badddbd..e356de7 100644
--- a/nerv/lib/matrix/generic/mmatrix.c
+++ b/nerv/lib/matrix/generic/mmatrix.c
@@ -507,6 +507,29 @@ void nerv_matrix_(scale_rows_by_col)(Matrix *a, const Matrix *b,
     NERV_SET_STATUS(status, NERV_NORMAL, 0);
 }
 
+void nerv_matrix_(set_values_by_mask)(Matrix *a, const Matrix *b, double val, 
+                                    MContext *context, Status *status) {
+    if (a->nrow != b->nrow)
+        NERV_EXIT_STATUS(status, MAT_MISMATCH_DIM, 0);
+    if (b->ncol != 1)
+        NERV_EXIT_STATUS(status, MAT_COL_VECTOR_EXP, 0);
+    int i, j;
+    size_t astride = a->stride, bstride = b->stride;
+    MATRIX_ELEM *arow = MATRIX_ELEM_PTR(a),
+                *brow = MATRIX_ELEM_PTR(b);
+    for (i = 0; i < a->nrow; i++)
+    {
+        if (brow[0] == 0.0)
+        {
+            for (j = 0; j < a->ncol; j++)
+                arow[j] = val;
+        }
+        arow = MATRIX_NEXT_ROW_PTR(arow, astride);
+        brow = MATRIX_NEXT_ROW_PTR(brow, bstride);
+    }
+    NERV_SET_STATUS(status, NERV_NORMAL, 0);
+}
+
 static void host_matrix_(free)(MATRIX_ELEM *ptr, MContext *context, Status *status) {
     free(ptr);
     NERV_SET_STATUS(status, NERV_NORMAL, 0);