From a643248aa5e1ad322776f413b0874fb9b1fe9b14 Mon Sep 17 00:00:00 2001
From: Matthew Ellison <m_ellison@ymail.com>
Date: Mon, 7 Feb 2022 19:27:53 +0000
Subject: [PATCH] Added adjoint and inverse functions

---
 .../com/mattrixwv/matrix/IntegerMatrix.java   | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/main/java/com/mattrixwv/matrix/IntegerMatrix.java b/src/main/java/com/mattrixwv/matrix/IntegerMatrix.java
index 205b695..a77eb76 100644
--- a/src/main/java/com/mattrixwv/matrix/IntegerMatrix.java
+++ b/src/main/java/com/mattrixwv/matrix/IntegerMatrix.java
@@ -680,6 +680,9 @@ public class IntegerMatrix{
 		//Return the determinant
 		return det;
 	}
+	public IntegerMatrix cof(){
+		return cofactor();
+	}
 	public IntegerMatrix cofactor(){
 		//Make sure the matrix is square
 		if(!isSquare()){
@@ -706,6 +709,27 @@ public class IntegerMatrix{
 		//Return the new matrix
 		return new IntegerMatrix(newGrid);
 	}
+	public IntegerMatrix adj(){
+		return adjoint();
+	}
+	public IntegerMatrix adjoint(){
+		return cofactor().transpose();
+	}
+	public IntegerMatrix inverse(){
+		//Make sure the matrix is square
+		if(!isSquare()){
+			throw new InvalidGeometryException("A matrix must be square for it to have an inverse");
+		}
+
+		//Make sure the determinant is not 0
+		int determinant = determinant();
+		if(determinant == 0){
+			throw new InvalidScalarException("The determinant cannot be 0");
+		}
+
+		//Return the new matrix
+		return adjoint().multiply(1 / determinant);
+	}
 
 	//Object funtions
 	@Override