From 83e86f7edab4d56b8cccf9554449da829427de12 Mon Sep 17 00:00:00 2001
From: sr1g19 <sr1g19@soton.ac.uk>
Date: Tue, 11 May 2021 04:18:54 +0000
Subject: [PATCH] Upload New File
---
src/matrix/2x2matrix.c | 70 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 70 insertions(+)
create mode 100644 src/matrix/2x2matrix.c
diff --git a/src/matrix/2x2matrix.c b/src/matrix/2x2matrix.c
new file mode 100644
index 0000000..084b802
--- /dev/null
+++ b/src/matrix/2x2matrix.c
@@ -0,0 +1,70 @@
+#include "2x2matrix.h"
+
+_2x2Matrix add_2x2(_2x2Matrix m1, _2x2Matrix m2){
+ _2x2Matrix ma = {
+ m1.a11 + m2.a11,m1.a12 + m2.a12,
+ m1.a21 + m2.a21,m1.a22 + m2.a22
+ };
+
+ return ma;
+}
+
+_2x2Matrix minus_2x2(_2x2Matrix m1, _2x2Matrix m2){
+ _2x2Matrix ma = {
+ m1.a11 - m2.a11,m1.a12 - m2.a12,
+ m1.a21 - m2.a21,m1.a22 - m2.a22
+ };
+
+ return ma;
+}
+
+_2x2Matrix multiply_2x2(_2x2Matrix m1, _2x2Matrix m2){
+ _2x2Matrix ma = {
+ (m1.a12 * m2.a21) + (m1.a11 * m2.a11),(m1.a11 * m2.a12) + (m1.a12 * m2.a22),
+ (m1.a22 * m2.a21) + (m1.a21 * m2.a11),(m1.a21 * m2.a12) + (m1.a22 * m2.a22)
+ };
+
+ return ma;
+}
+
+_2x2Matrix scale_2x2(_2x2Matrix m1, float scale) {
+ _2x2Matrix ma = {
+ m1.a11 * scale,m1.a12 * scale,
+ m1.a21 * scale,m1.a22 * scale
+ };
+
+ return ma;
+}
+
+float det_2x2(_2x2Matrix m){
+ return (m.a11 * m.a22) - (m.a12 * m.a21);
+}
+
+_2x2Matrix inverse_2x2(_2x2Matrix m){
+ float detM = det_2x2(m);
+ if(detM != 0){
+ _2x2Matrix specMat = {m.a22, -m.a12,
+ -m.a21, m.a11};
+ return scale_2x2(specMat, 1.0/detM);
+ }
+ _2x2Matrix badM = {1.0f,1.0f,1.0f,1.0f};
+ return badM;
+}
+
+_2x1Matrix transpose_2x2(_2x2Matrix m1, _2x1Matrix m2){
+ _2x1Matrix ma = {
+ (m1.a12*m2.a21) + (m1.a11*m2.a11),
+ (m1.a22*m2.a21) + (m1.a21*m2.a11)
+ };
+
+ return ma;
+}
+
+unsigned char equals_2x2(_2x2Matrix m1, _2x2Matrix m2) {
+ if(m1.a11 == m2.a11
+ && m1.a12 == m2.a12
+ && m1.a21 == m2.a21
+ && m1.a22 == m2.a22)
+ return 42;
+ return 0;
+}
--
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