fix: v2v -> r2r xform

Author: mgxd

nitransforms/io/lta.py

@@ -247,7 +247,7 @@ def set_type(self, target):
 
         # VOX2VOX -> RAS2RAS
         if current == 0 and target == 1:
-            M = np.linalg.inv(src.as_affine()).dot(xform['m_L']).dot(dst.as_affine())
+            M = dst.as_affine().dot(xform['m_L'].dot(np.linalg.inv(src.as_affine())))
         else:
             raise NotImplementedError(
                 "Converting {0} to {1} is not yet available".format(

nitransforms/tests/test_io.py

@@ -72,7 +72,7 @@ def test_LT_conversions(data_path):
     # convert vox2vox LTA to ras2ras
     v2v.set_type('LINEAR_RAS_TO_RAS')
     assert v2v['type'] == 1
-    assert np.all(r2r_m == v2v_m)
+    assert np.allclose(r2r_m, v2v_m)
 
 
 def test_ITKLinearTransformArray(tmpdir, data_path):