"""
Exercise 7.1 from "A primer on..."
Make a class to represent a parameterized
function. Very similar to the example
from the lecture, just with a different
mathematical expression.
"""


import numpy as np

class F:
    def __init__(self, a, w):
        self.a = a
        self.w = w

    def value(self, x):
        a = self.a
        w = self.w
        return np.exp(-a * x) * np.sin(w * x)
    

#class usage:
f = F(a=1.0, w=0.1)
print(f.value(x = np.pi))
f.a = 2
print(f.value(x = np.pi))

"""
Terminal> python F.py 
0.01335383513703555
0.0005770715401197441
"""