我想解微分方程。 MATLAB顯示警告: clear all
syms x f(x) theta
eq = (-6*x+(-7+theta)*f*diff(f,x))*(1+diff(f,x)^2)+x*f*(diff(f,x,x))==0
cond = f(0)==1
dsolve(eq,cond)
Warning: Explicit solution could not be fo
我正在學習R解決一個二階微分方程(可能使用deSolve包)。這是我寫這兩個一階微分方程用Python編寫的,並給出以下 import numpy as np
import matplotlib.pyplot as plt
from scipy.integrate import odeint
def fun(X, t):
y , dy , z = X
M = np.sq
我有一個函數來計算1d np.array的有限差分,我想外推到一個n-d數組。 功能是這樣的: def fpp_fourth_order_term(U):
"""Returns the second derivative of fourth order term without the interval multiplier."""
# U-slices
fm2 =
我試圖用DifferentialEquation.jl包來解決ode45差分方程,但我得到一個方法錯誤。 using DifferentialEquations
M = 400; m = 35;
C = 3e3; c = 300;
K = 50e3; k = 200e3;
A = 0.05; L = 0.5; vh = 13.9
MM = [M 0;
0 m] # mas