Is there a way to create a grid of graphs with plots I already made?

Does this work for you?

import numpy as np
from numpy import e, pi, sin, exp, cos
import matplotlib.pyplot as plt


a = [1.02, .95, .87, .77, .67, .46, .74, .60]
b = [0.39, .32, .27, .22, .18, .15, .13, .12]
c = [0.49, .42, .37, .32, .28, .35, .33, .52]
d = [0.29, .52, .47, .52, .58, .35, .43, .32]


python_course_green = "#476042"
fig = plt.figure(figsize=(6, 4))

t = np.arange(-5.0, 1.0, 0.1)

sub1 = fig.add_subplot(221) # instead of plt.subplot(2, 2, 1)
sub1.set_title('Something A') # non OOP: plt.title('The function f')
sub1.plot(a)


sub2 = fig.add_subplot(222, facecolor="lightgrey")
sub2.set_title('Something B')
sub2.plot(b)


t = np.arange(-3.0, 2.0, 0.02)
sub3 = fig.add_subplot(223)
sub3.set_title('Something C')
sub3.plot(c)

t = np.arange(-0.2, 0.2, 0.001)
sub4 = fig.add_subplot(224, facecolor="lightgrey")
sub4.set_title('Something D')
sub4.plot(d)



plt.tight_layout()
plt.show()

Output

I hope I could help you out on this.