Reading individual variables from .mat file

[bhanson]

I have a Matlab .mat file and am attempting to read multiple variables (or
specify individual variables from a file containing multiple variables).
However, using the examples under "Matlab IO" documentation I am only able
to retrieve one variable (always the same one).  Any ideas?

Also, when attempting to use the 'iterator interface' example in the
documentation, I get the following error...

erminate called after throwing an instance of 'std::runtime_error'
  what():  Matlab_view_header(read): Unsupported data_element type: got
miCOMPRESSED (15), can only handl miMATRIX (14)

Thanks
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