In [1]: import numpy as np
In [2]: x = np.linspace(0, 4*np.pi, 11)
In [3]: y = exp(-0.1*x)*sin(x)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-3-c1040545fa6c> in <module>()
----> 1 y = exp(-0.1*x)*sin(x)
NameError: name 'exp' is not defined
In [4]: y = np.exp(-0.1*x)*np.sin(x)
In [5]: y
Out[5]:
array([ 0.00000000e+00, 8.38747563e-01, 4.57160372e-01,
-4.03174933e-01, -5.75315545e-01, -1.30666897e-16,
4.47461836e-01, 2.43889614e-01, -2.15089026e-01,
-3.06923992e-01, -1.39418467e-16])
This is the admon for warnings or paying attention.