I keep getting errors when I try to integrate kinematic and dynamic differential equation

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Sneh 2023-2-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1914405-i-keep-getting-errors-when-i-try-to-integrate-kinematic-and-dynamic-differential-equation

评论： Alan Stevens 2023-2-17

import numpy as np

from scipy.integrate import quad

def kde_integral(x):

return (1/np.sqrt(2*np.pi))*np.exp(-x*2/2)

def dde_integral(x):

return 2*x*(1/np.sqrt(2*np.pi))*np.exp(-x*2/2)

integ_kde = quad(kde_integral, -np.inf, np.inf)[0]

integ_dde = quad(dde_integral, -np.inf, np.inf)[0]

% Plotting the K-Ko graph

def plot_kk_graph():

x = np.linspace(-5, 5, 1000)

kde_y = kde_integral(x)

dde_y = dde_integral(x)

k = np.trapz(kde_y, x=x)

ko = np.trapz(dde_y, x=x)

plt.plot(k, ko, color='b')

plt.title("K-Ko Graph")

plt.xlabel("K")

plt.ylabel("Ko")

plt.show()

plot_kk_graph()

I get the following errors:

Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

How do i fix it?