def aprint(a,decimals=2):
"""prints array / masked array of floats"""
if isinstance(a, Numeric.ArrayType):
print Numeric.around(a.astype(Numeric.Float0),decimals)
elif type(a) == MA.MaskedArray:
print MA.around(a.astype(Numeric.Float0),decimals)
def function(self,p):
"""
Return a square-wave grating (alternating black and white bars).
"""
return around(0.5 + 0.5*sin(p.frequency*2*pi*self.pattern_y + p.phase))