From a2ad829d52435478f2fb66168dc4d42742647396 Mon Sep 17 00:00:00 2001
From: Al <albarrentine@gmail.com>
Date: Fri, 16 Oct 2015 16:26:27 -0400
Subject: [PATCH] [math] matrix scalar arithmetic

---
 src/matrix.c | 21 +++++++++++++++++++--
 src/matrix.h |  5 ++++-
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/src/matrix.c b/src/matrix.c
index ee176a56..0c42c340 100644
--- a/src/matrix.c
+++ b/src/matrix.c
@@ -74,10 +74,27 @@ matrix_t *matrix_new_values(size_t m, size_t n, double *values) {
     return matrix;
 }
 
-inline void matrix_scale(matrix_t *self, double value) {
-    double_array_mul(self->values, self->m * self->n, value);
+
+inline void matrix_div(matrix_t *self, double value) {
+    double_array_div(self->values, value, self->m * self->n);
 }
 
+
+inline void matrix_mul(matrix_t *self, double value) {
+    double_array_mul(self->values, value, self->m * self->n);
+}
+
+
+inline void matrix_add(matrix_t *self, double value) {
+    double_array_add(self->values, self->m * self->n, value);
+}
+
+
+inline void matrix_sub(matrix_t *self, double value) {
+    double_array_sub(self->values, value, self->m * self->n);
+}
+
+
 void matrix_dot_vector(matrix_t *self, double *vec, double *result) {
     double *values = self->values;
     size_t n = self->n;
diff --git a/src/matrix.h b/src/matrix.h
index 4ddfdb8a..e5384312 100644
--- a/src/matrix.h
+++ b/src/matrix.h
@@ -27,7 +27,10 @@ void matrix_set_scalar(matrix_t *self, size_t row_index, size_t col_index, doubl
 
 double matrix_get(matrix_t *self, size_t row_index, size_t col_index);
 
-void matrix_scale(matrix_t *self, double value);
+void matrix_add(matrix_t *self, double value);
+void matrix_sub(matrix_t *self, double value);
+void matrix_mul(matrix_t *self, double value);
+void matrix_div(matrix_t *self, double value);
 void matrix_dot_vector(matrix_t *self, double *vec, double *result);
 int matrix_dot_matrix(matrix_t *m1, matrix_t *m2, matrix_t *result);