Hi Nathan, Thank you very much for your prompt reply. test_coarsen.py works fine for me with latest svn python -i /usr/local/lib64/python2.5/site-packages/scipy/sandbox/multigrid/tests/test_coarsen.py Found 7/7 tests for __main__ ....... ---------------------------------------------------------------------- Ran 7 tests in 8.015s OK

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but python -i /usr/local/lib64/python2.5/site-packages/scipy/sandbox/multigrid/tests/examples.py All Available Examples Are Listed Below torus.mtx.gz Traceback (most recent call last): File "/usr/local/lib64/python2.5/site-packages/scipy/sandbox/multigrid/tests/examples.py", line 25, in <module> print repr(read_matrix(filename)) File "/usr/local/lib64/python2.5/site-packages/scipy/sandbox/multigrid/tests/examples.py", line 8, in read_matrix fid = gzip.open(filename) File "/usr/lib64/python2.5/gzip.py", line 49, in open return GzipFile(filename, mode, compresslevel) File "/usr/lib64/python2.5/gzip.py", line 95, in __init__ fileobj = self.myfileobj = __builtin__.open(filename, mode or 'rb') IOError: [Errno 2] No such file or directory: 'sample_data/torus.mtx.gz' Best wishes Nils