Update maths.py

Author: Leoniela

nipype/interfaces/fsl/maths.py

@@ -103,6 +103,17 @@ def _format_arg(self, name, spec, value):
             return arg
         return super(Threshold, self)._format_arg(name, spec, value)
 
+class StdImageInput(MathsInput):
+
+    dimension = traits.Enum("T", "X", "Y", "Z", usedefault=True, argstr="-%sTstd", position=4,
+                            desc="dimension to standard deviate across")
+
+
+class StdImage(MathsCommand):
+    """Use fslmaths to generate a standard deviation in an image across a given dimension.
+    """
+    input_spec = StdImageInput
+_suffix = "_std"
 
 class MeanImageInput(MathsInput):