我有这个代码：

import matplotlib.pyplot as pl
pl.plot(np.log(alphas_lasso),coefs_lasso.T) #this generate a plot which xlim=[-8,-2]
for alpha in alpha_min:
    pl.axvline(np.log(alpha),0,1) #add vertical line for every value of alpha
pl.xlim([-10,0]) # the xlim value I would like to set
pl.xlabel('Log(alpha)')
pl.ylabel('coefficients')
pl.title('Lasso Path')
pl.axis('tight')
pl.show()
print "log(alpha_min)=",log(alpha_min)

它工作，但x轴从-8到-2，而我想从-10到0，误差在哪里？