Added adjoint and inverse functions

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