我有一个与轨道力学中的太阳同步共振条件相关的方程。我目前正在学习Python,所以我尝试使用以下代码在SymPy中解决它:
from sympy import symbols,solve
[n_,Re_,p_,i_,J2_,Pe_] = symbols(['n_','Re_','p_','i_','J2_','Pe_'])
del_ss = -((3*n_*(Re_**2)*J2_/(4*(p_**2)))*(4-5*(sin(i_)**2)))-((3*n_*(Re_**2)*J2_/(2*(p_**2)))*cos(i_))-((2*pi)/Pe_)
pprint(solve(del_ss,i_))
表达式可以成功地重新排列五个变量,但是当变量
i_
在solve
命令中使用时(如上所示),会产生错误:Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 479, in runfile
execfile(filename, namespace)
File "C:\Users\Nathan\Python\sympy_test_1.py", line 22, in <module>
pprint(solve(del_ss,i_))
File "C:\Python27\lib\site-packages\sympy\solvers\solvers.py", line 484, in solve
solution = _solve(f, *symbols, **flags)
File "C:\Python27\lib\site-packages\sympy\solvers\solvers.py", line 700, in _solve
soln = tsolve(f_num, symbol)
File "C:\Python27\lib\site-packages\sympy\solvers\solvers.py", line 1143, in tsolve
"(tsolve: at least one Function expected at this point")
NotImplementedError: Unable to solve the equation(tsolve: at least one Function expected at this point
然而,当同样的表达式输入到Matlab中并调用
solve
命令时,它会被正确地重新排列。我意识到错误提到了一个未实现的功能,并且这两个函数无疑会有所不同,但如果有更适合的SymPy函数可用的话,那就太好了。任何帮助都将不胜感激。