python类poly1d()的实例源码

def _plot_correlation_func(x, y):

    r, p = pearsonr(x, y)
    title = "Cor($X_1$, $X_2$) = %.3f" % r
    pylab.scatter(x, y)
    pylab.title(title)
    pylab.xlabel("$X_1$")
    pylab.ylabel("$X_2$")

    f1 = scipy.poly1d(scipy.polyfit(x, y, 1))
    pylab.plot(x, f1(x), "r--", linewidth=2)
    # pylab.xticks([w*7*24 for w in [0,1,2,3,4]], ['week %i'%(w+1) for w in
    # [0,1,2,3,4]])

def multiplyPoly():  
    #cubic1 has coefficients 3, 4, 5 and 5 
    cubic1 = sp.poly1d([3, 4, 5, 5])  

    #cubic2 has coefficients 4, 1, -3 and 3
    cubic2 = sp.poly1d([4, 1, -3, 3]) 

    print cubic1   
    print cubic2 

    print '-' * 36

    #print results of polynomial multiplication
    print cubic1 * cubic2