Traceback (most recent call last):
  File "c:\orange\Orange/testing/regression\xtest_one.py", line 115, in <module>
    execfile(t__name)
  File "modules_hclust-test1.py", line 5, in <module>
    d = orngClustering.DendrogramPlotPylab(root, data=data, labels=[str(ex.getclass()) for ex in data])
  File "c:\orange\Orange\clustering\hierarchical.py", line 845, in __init__
    raise ImportError("Could not import matplotlib module. Please make sure matplotlib is installed on your system.")
ImportError: Could not import matplotlib module. Please make sure matplotlib is installed on your system.
