filename — File name character vector | string scalar
File name, specified as a character vector or string scalar containing the
name of an existing HDF5 file.
loc — Location in file character vector | string scalar
Location in the file, specified as a character vector or string scalar
containing the full path of an existing group or dataset to which the
attribute belongs. To read an attribute from the root group of the file,
specify '/' as the location.
attr — Attribute name character vector | string scalar
Attribute name, specified as a character vector or string scalar
containing the name of an attribute belonging to a group or dataset.