[SymForce-External] Add Matrix.det()

Add `Matrix.det()`

For #306

Topic: sf-matrix-det
Closes #307
GitOrigin-RevId: 5f4745faf9c56e6356ba075ed7866af5d0cfb52d

symforce/geo/matrix.py

@@ -345,6 +345,12 @@ def eye(cls: _T.Type[MatrixT], rows: int = None, cols: int = None) -> MatrixT:
             mat[i, i] = sf.S.One
         return mat
 
+    def det(self) -> _T.Scalar:
+        """
+        Determinant of the matrix.
+        """
+        return self.mat.det()
+
     def inv(self: MatrixT, method: str = "LU") -> MatrixT:
         """
         Inverse of the matrix.

test/geo_matrix_test.py

@@ -124,9 +124,10 @@ def test_matrix_initialization(self) -> None:
     def test_matrix_operations(self) -> None:
         """
         Tests:
-            Matrix.Matrix_inverse
+            Matrix.inv()
             Matrix.__add__ (scalar_like)
             Matrix.__div__ (scalar_like)
+            Matrix.det()
         """
 
         test_matrix = sf.Matrix([[2, 0], [0, 4]])
@@ -139,6 +140,8 @@ def test_matrix_operations(self) -> None:
         self.assertEqual(sf.Matrix.eye(2), diag_matrix / 2)
         self.assertEqual(sf.Matrix.eye(2), sf.Matrix(test_matrix / test_matrix))
 
+        self.assertEqual(diag_matrix.det(), 4)
+
     def test_symbolic_operations(self) -> None:
         """
         Tests: