以下可能是您想要的。您可以将中间值存储在列表中，然后再绘制该列表。那也需要存储x值。
import numpy as np
import matplotlib.pyplot as plt
from scipy.integrate import odeint
xs = []
yd = []
def dY(y, x):
a = 0.001
yin = 1
C = 0.01
N = 1
dC = C/N
b1 = 0
y_diff = -np.copy(y)
y_diff[0] += yin
y_diff[1:] += y[:-1]
xs.append(x)
yd.append(y_diff)
return (a/dC)*y_diff+b1*dC
x = np.linspace(0,20,1000)
y0 = np.zeros(4)
res = odeint(dY, y0, x)
plt.plot(x,res, '-')
plt.gca().set_prop_cycle(plt.rcParams['axes.prop_cycle'])
plt.plot(np.array(xs),np.array(yd), '-.')
plt.show()
虚线是相同颜色y_diff的res溶液的相应值。
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