1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
import numpy as np
import matplotlib.pyplot as plt
@np.vectorize
def fn(x):
return (x ** 2) * 2 / 100 + (1 + x / 4) + np.sin(x)
@np.vectorize
def ddfn(x):
return 2 * 5 / 100 - np.sin(x)
x = np.linspace(0, 10, 500)
y = fn(x)
ddy = ddfn(x)
cmap = ddy - np.min(ddy)
cmap = cmap * 1000 / np.max(cmap)
plt.plot(x, y)
plt.plot(x, ddy)
# plt.plot(x, cmap)
plt.show()
fname = "laplacian-1d.dat"
np.savetxt(fname, np.array([x, y, cmap]).T, delimiter=" ")
# with open(fname, "w") as f:
# # f.write("x y cmap\n")
# for xv, yv, cv in zip(x, y, cmap):
# f.write(f"{xv} {yv} {cv}\n")
|
