def makeTagField(functionspace):
"""
this creates a data object making the tagged regions with the corresponding tag id
:param functionspace: function space to create tags for
:type functionspace: `esys.escript.FunctionSpace`
:return: `esys.escript.Scalar` with tags
"""
out = Scalar(-1, functionspace)
for t in functionspace.getListOfTags():
out.setTaggedValue(t, t)
out.expand()
return out
