def round_sigfigs(x, n=2):
    """
    Rounds the number to the specified significant figures. x can also be 
    a list or array of numbers (in these cases, a numpy array is returned).
    """
    iterable = is_iterable(x)
    if not iterable: x = [x]

    # make a copy to be safe
    x = _n.array(x)
    
    # loop over the elements
    for i in range(len(x)):
        
        # Handle the weird cases
        if not x[i] in [None, _n.inf, _n.nan]:
            sig_figs = -int(_n.floor(_n.log10(abs(x[i]))))+n-1
            x[i] = _n.round(x[i], sig_figs)
        
    if iterable: return x
    else:        return x[0]
Rounds the number to the specified significant figures. x can also be 
    a list or array of numbers (in these cases, a numpy array is returned).