from matplotlib.numerix import which

if which[0] == "numarray":
    from numarray.fft import *
elif which[0] == "numeric":
    from FFT import *
elif which[0] == "numpy":
    try:
        from numpy.oldnumeric.fft import *
    except ImportError:
        from numpy.dft.old import * 
else:
    raise RuntimeError("invalid numerix selector")