ReadHDF5Attribute
=================
```{function}  ReadHDF5Attribute(file, groupname, attr_name)
```
Full definition:
```{code-block} matlab
attr = ReadHDF5Attribute(file, groupname, attr_name)
```

internal function for openEMS to read hdf5 attributes

See also: ReadHDF5ComplexData



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author: Thorsten Liebig, 2012