1 files changed, 2 insertions, 2 deletions
diff --git a/matrix.c b/matrix.c
index a784308..9992bfb 100644
--- a/matrix.c
+++ b/matrix.c
@@ -206,7 +206,7 @@ Matrix *matrix_add(const Matrix *A, const Matrix *B)
     return C;
 }
 
-Matrix *matrix_scale(double x, const Matrix *A)
+Matrix *matrix_scale(const Matrix *A, double x)
 {
     Matrix *tmp = matrix_alloc(A->m, A->n);
 
@@ -221,7 +221,7 @@ Matrix *matrix_scale(double x, const Matrix *A)
 
 Matrix *matrix_sub(const Matrix *A, const Matrix *B)
 {
-    return matrix_add(A, matrix_scale(-1, B));
+    return matrix_add(A, matrix_scale(B, -1));
 }
 
 Matrix *matrix_mult(const Matrix *A, const Matrix *B)