我正在学习 Pyomo 并尝试使用 ipopt 来解决示例问题。但最初，我已经安装了软件包，然后它总是显示没有找到 ipopt 。之后我重新安装了很多次，现在显示
'''WARNING: Could not locate the 'ipopt' executable, which is required for solver
ipopt
---------------------------------------------------------------------------
ApplicationError Traceback (most recent call last)
<ipython-input-2-2e55f87657f9> in <module>
1 model.N=50
2 instance = model.create_instance()
----> 3 results = opt.solve(instance) # solves and updates instance
D:\Anacondo\lib\site-packages\pyomo\opt\base\solvers.py in solve(self, *args, **kwds)
514 """ Solve the problem """
515
--> 516 self.available(exception_flag=True)
517 #
518 # If the inputs are models, then validate that they have been
D:\Anacondo\lib\site-packages\pyomo\opt\solver\shellcmd.py in available(self, exception_flag) …