任意の数を+1する関数 ( https://www.youtube.com/watch?v=J2i24ML5hX0&t=1024s , https://www.youtube.com/watch?v=QW1wHdg3ji0&lc=UgzwbeakCr8M2YMAq4B4AaABAg )

.py

# %%
import matplotlib.pyplot as plt
import numpy as np
import sympy as sym

xs = np.arange(0, 10, 1E-2)
xs[0] = 1E-7
x = sym.Symbol('x')


def minusLn(x):
    return -sym.log(x)


def minusExp(x):
    return -sym.exp(x)


fig, ax = plt.subplots(figsize=(11.69, 8.27), dpi=600)
ys = x
for fn in [sym.sqrt, sym.atan, sym.cos, minusLn, minusLn, minusExp, sym.exp, sym.sqrt, minusLn, minusLn, sym.exp, sym.exp]:
    ys = fn(ys)
    ax.plot(xs, [ys.evalf(subs={x: v}) for v in xs], label=f'${sym.latex(ys)}$')

ax.set_ylim(-4, 8)
ax.set_xticks(range(11))
ax.set_yticks([x-4 for x in range(13)])
ax.grid()
ax.legend(loc='lower right')
ax.set_aspect('equal')