Traceback (most recent call last):



 "<ipython-input-18-89b3a88f1417>", line 1, in <module>

Step(s1)



 "C:/Users/ruben/Documents/Python Workspace/test.py", line 47, in Step

yout, T = matlab.step(system)



 "C:\Users\ruben\Anaconda3\lib\site-packages\control\matlab.py", line 1328, in step

transpose = True, **keywords)



 "C:\Users\ruben\Anaconda3\lib\site-packages\control\timeresp.py", line 483, in step_response

sys = _get_ss_simo(sys, input, output)



 "C:\Users\ruben\Anaconda3\lib\site-packages\control\timeresp.py", line 409, in _get_ss_simo

sys_ss = _convertToStateSpace(sys)



 "C:\Users\ruben\Anaconda3\lib\site-packages\control\statesp.py", line 668, in _convertToStateSpace

return StateSpace(lti_sys.A, lti_sys.B, lti_sys.C, lti_sys.D,

AttributeError: 'TransferFunctionContinuous' object has no attribute 'A'

Traceback (most recent call last):


 "infer.py", line 25, in <module>

exe.run(fluid.default_startup_program())


 "C:\Users\Admin\AppData\Local\Programs\Python\Python37\lib\site-packages\paddle\fluid\executor.py", line 1108, in run

six.reraise(*sys.exc_info())


 "C:\Users\Admin\AppData\Local\Programs\Python\Python37\lib\site-packages\six.py", line 703, in reraise

raise value


 "C:\Users\Admin\AppData\Local\Programs\Python\Python37\lib\site-packages\paddle\fluid\executor.py", line 1106, in run

return_merged=return_merged)


 "C:\Users\Admin\AppData\Local\Programs\Python\Python37\lib\site-packages\paddle\fluid\executor.py", line 1236, in _run_impl

use_program_cache=use_program_cache)


 "C:\Users\Admin\AppData\Local\Programs\Python\Python37\lib\site-packages\paddle\fluid\executor.py", line 1330, in _run_program

arr = scope.find_var(fetch_var_name).get_fetch_list()
AttributeError: 'NoneType' object has no attribute 'get_fetch_list'
