@@ -1545,7 +1545,11 @@ def update_headers(self):
15451545 >>> img.shape == (2, 3, 4)
15461546 True
15471547 """
1548- self ._nifti_header .set_data_shape ((1 ,1 ,1 ,1 )+ self ._dataobj .shape )
1548+ header = self ._nifti_header
1549+ header .set_data_shape ((1 ,1 ,1 ,1 )+ self ._dataobj .shape )
1550+ # if intent code is not set, default to unknown
1551+ if header .get_intent ()[0 ]== 'none' :
1552+ header .set_intent ('NIFTI_INTENT_CONNECTIVITY_UNKNOWN' )
15491553
15501554def get_data_dtype (self ):
15511555return self ._nifti_header .get_data_dtype ()
@@ -1565,8 +1569,6 @@ def to_filename(self, filename, validate=True):
15651569 for the expected IndicesMaps attributes.
15661570 If validation fails, an error will be raised instead.
15671571 """
1568- nheader = self ._nifti_header
1569- # try to infer intent code based on filename suffix
15701572if validate :
15711573ext = _extract_cifti_extension (filename )
15721574try :
@@ -1576,7 +1578,7 @@ def to_filename(self, filename, validate=True):
15761578f"Validation failed: No information for extension{ ext }
15771579 )from err
15781580intent = CIFTI_CODES .niistring [ext ]
1579- nheader .set_intent (intent )
1581+ self . _nifti_header .set_intent (intent )
15801582# validate matrix indices
15811583for idx ,mtype in enumerate (CIFTI_CODES .map_types [ext ]):
15821584try :
@@ -1586,9 +1588,6 @@ def to_filename(self, filename, validate=True):
15861588f"Validation failed: Cifti2Matrix index map{ idx }
15871589f"not match expected type{ mtype }
15881590 )
1589- # if intent code is not set, default to unknown
1590- if nheader .get_intent ()[0 ]== 'none' :
1591- nheader .set_intent ('NIFTI_INTENT_CONNECTIVITY_UNKNOWN' )
15921591super ().to_filename (filename )
15931592
15941593