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Pearson 1D and 2D function exercise
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If you don't already have a clone of the  ``classwork`` repository::

  git clone https://github.com/psych-214-fall-2016/classwork.git
  cd classwork/pearson

If you do already have a version of the ``classwork`` repository::

  cd classwork
  git fetch origin
  git merge origin/master
  cd pearson

To start the exercise::

  py.test test_pearson_1d.py

When that is working then::

  py.test test_pearson_2d.py