fix catmatvec hash and output

Author: salma1601

nipype/interfaces/afni/utils.py

@@ -564,8 +564,11 @@ class CatMatvecInputSpec(AFNICommandInputSpec):
         argstr="%s",
         position=-2)
     out_file = File(
-        desc="File to write concattenated matvecs to",
         argstr=" > %s",
+        name_template='%s_cat.aff12.1D',
+        name_source='in_file',
+        keep_extension=False,
+        desc="File to write concattenated matvecs to",
         position=-1,
         mandatory=True)
     matrix = traits.Bool(
@@ -616,6 +619,13 @@ def _format_arg(self, name, spec, value):
                                             for i in value]))
         return super(CatMatvec, self)._format_arg(name, spec, value)
 
+    def _list_outputs(self):
+        outputs = self.output_spec().get()
+
+        if self.inputs.out_file:
+            outputs['out_file'] = op.abspath(self.inputs.out_file)
+        return outputs
+
 
 class CenterMassInputSpec(CommandLineInputSpec):
     in_file = File(