def assertPathExists(self, path):
        if not os.path.exists(path):
            self.fail('Path: "%s" does not exist' % path)
Matrix and scalar subtraction.
dataset/ETHPy150Open jlisee/xpkg/python/tests/fulltests.py/TestBase.assertPathExists--crossover with--dataset/ETHPy150Open jimmycallin/pydsm/pydsm/indexmatrix.py/IndexMatrix.subtract