Chapter-3,Visualization using Matplotlib,page-170(Legends)

[Sarthak-Sunny]

plt.plot(x,y,'g',label='y=x^2')
plt.plot(x,z,'b:',label='y=x')
plt.legend(loc="best")
plt.title('Legend Sample')
While trying to exceute following code mention in your book, i am getting error as-
ValueError: x and y must have same first dimension, but have shapes (10,) and (50,)