LGTM.com - false positive (python)

**Description of the false positive**

https://lgtm.com/projects/g/petercorke/spatialmath-python/snapshot/406209fe003b474951a109d907069933f48f82b7/files/spatialmath/base/__init__.py?sort=name&dir=ASC&mode=heatmap#xd0af4bbbf721847c:1

One function, getvector(), is singled out as being undefined. It is imported in line 5, and then in line 18 it is exported again. The function is defined at line 213 of

https://lgtm.com/projects/g/petercorke/spatialmath-python/snapshot/406209fe003b474951a109d907069933f48f82b7/files/spatialmath/base/argcheck.py#L213

and I can vouch that this works in production use.

I have no idea why just this function is flagged. However, it is the only function that has a NumPy constant as a default value for one of its function parameters

```
def getvector(v, dim=None, out='array', dtype=np.float64):
```