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# $Id: __init__.py,v 1.2 2010-05-28 18:43:59 wirawan Exp $
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#
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# wpylib.math main module
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# Created: 20091204
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# Wirawan Purwanto
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#
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pass
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import numpy
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ZERO_TOL = 5.0e-16
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def ztol(val, tol=None, copy=True):
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"""Rounds down values to zero if they are below tolerance."""
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if tol == None: tol = ZERO_TOL
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if "__iter__" not in dir(val):
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if numpy.abs(val) < tol:
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return 0
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else:
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return val
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elif isinstance(val, numpy.ndarray):
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if copy:
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rslt = val.copy()
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else:
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rslt = val
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numpy.putmask(rslt, numpy.abs(rslt) < tol, [0])
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return rslt
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else:
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raise ValueError, "Unsupported datatype: %s" % str(type(val))
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