python-control-discuss

[python-control-discuss] really weird error for SISO step response

[Ryan K. <kra...@gv...>]

I am trying to do a super basic step response for a first order TF and am
getting an error I have never seen before.  The notebook is attached, but
here is the code and the error message:

%matplotlib inline
import matplotlib.pyplot as plt
import numpy as np
import control
from numpy import sin, cos, tan, pi
from control import TransferFunction as TF

p = 30

G = control.TransferFunction(p,[1,p])
G

control.step_response(G)

---------------------------------------------------------------------------ValueError
                               Traceback (most recent call
last)<ipython-input-7-7235fbf92fdd> in <module>()----> 1
control.step_response(G)
/usr/local/lib/python3.6/site-packages/control/timeresp.py in
step_response(sys, T, X0, input, output, transpose, return_x)    450
  >>> T, yout = step_response(sys, T, X0)    451     """--> 452
sys = _get_ss_simo(sys, input, output)    453     if T is None:    454
        if isctime(sys):
/usr/local/lib/python3.6/site-packages/control/timeresp.py in
_get_ss_simo(sys, input, output)    378     If input is not specified,
select first input and issue warning    379     """--> 380     sys_ss
= _convertToStateSpace(sys)    381     if sys_ss.issiso():    382
   return sys_ss
/usr/local/lib/python3.6/site-packages/control/statesp.py in
_convertToStateSpace(sys, **kw)    895             # transfer function
to state space conversion now should work!    896             ssout =
td04ad('C', sys.inputs, sys.outputs,--> 897
denorder, den, num, tol=0)    898     899             states =
ssout[0]
/usr/local/lib/python3.6/site-packages/slycot/transform.py in
td04ad(rowcol, m, p, index, dcoeff, ucoeff, tol, ldwork)    446
 e = ValueError(error_text)    447         e.info = out[-1]--> 448
    raise e    449     if out[-1] > 0:    450         error_text =
"The leading coefficient of a denominator polynomial is nearly zero;
calculations would overflow; no state-space representation was
calculated. ABS(DCOEFF("+str(out[-1])+",1))="+str(abs(dcoeff(out[-1],1)))+"
is too small."
ValueError: The following argument had an illegal value: dcoeff


--
Dr. Ryan Krauss
Associate Professor
Product Design and Manufacturing Engineering
Grand Valley State University

Re: [python-control-discuss] really weird error for SISO step response

[Murray, R. M. <mu...@cd...>]

Which version of python-control and slycot?  I just ran against the latest master and slycot 0.3.4 and it didn’t generate an error.

-richard

> On 29 Aug 2019, at 11:04 , Ryan Krauss <kra...@gv...> wrote:
> 
> I am trying to do a super basic step response for a first order TF and am getting an error I have never seen before.  The notebook is attached, but here is the code and the error message:
> 
> %matplotlib inline
> import matplotlib.pyplot as plt
> import numpy as np
> import control
> from numpy import sin, cos, tan, pi
> from control import TransferFunction as TF
> 
> p = 30
> 
> G = control.TransferFunction(p,[1,p])
> G
> 
> control.step_response(G)
> 
> ---------------------------------------------------------------------------
> ValueError
>                                 Traceback (most recent call last)
> 
> <ipython-input-7-7235fbf92fdd> in <module>()
> ----> 1 control.step_response(G)
> 
> 
> 
> /usr/local/lib/python3.6/site-packages/control/timeresp.py in step_response(sys, T, X0, input, output, transpose, return_x)
>     450     >>> T, yout = step_response(sys, T, X0)
>     451
>      """
> 
> --> 452     sys = _get_ss_simo(sys, input, output)
>     453     if T is None:
>     454         if isctime(sys):
> 
> 
> 
> /usr/local/lib/python3.6/site-packages/control/timeresp.py in _get_ss_simo(sys, input, output)
>     378     If input is not specified, select first input and
>  issue warning
> 
>     379
>      """
> 
> --> 380     sys_ss = _convertToStateSpace(sys)
>     381     if sys_ss.issiso():
>     382         return
>  sys_ss
> 
> 
> /usr/local/lib/python3.6/site-packages/control/statesp.py in _convertToStateSpace(sys, **kw)
>     895             # transfer function to state space conversion now should work!
>     896
>              ssout = td04ad('C', sys.inputs, sys.outputs,
> 
> --> 897
>                             denorder, den, num, tol=0)
> 
>     898
>  
> 
>     899             states = ssout[0]
> 
> 
> 
> /usr/local/lib/python3.6/site-packages/slycot/transform.py in td04ad(rowcol, m, p, index, dcoeff, ucoeff, tol, ldwork)
>     446         e = ValueError(error_text)
>     447         e.info = out[-1]
> --> 448         raise
>  e
> 
>     449     if out[-1] > 0:
>     450         error_text = "The leading coefficient of a denominator polynomial is nearly zero; calculations would overflow; no state-space representation was calculated. ABS(DCOEFF("+str(out[-1])+",1))="+str(abs(dcoeff(out[-1],1)))+" is too small."
> 
> 
> 
> ValueError: The following argument had an illegal value: dcoeff
> 
> --
> Dr. Ryan Krauss
> Associate Professor
> Product Design and Manufacturing Engineering
> Grand Valley State University
> <illegeal_dcoeff.ipynb>_______________________________________________
> python-control-discuss mailing list
> pyt...@li...
> https://lists.sourceforge.net/lists/listinfo/python-control-discuss

Re: [python-control-discuss] really weird error for SISO step response

[Ryan K. <kra...@gv...>]

I just ran a pip upgrade for the control module.  I am running 0.8.2.

I just tried upgrading slycot via pip.  pip says I am currently running
0.3.0.  I tried to upgrade to 0.3.5 via pip, but I receive error messages
about gfortran and xcode.  I am kind of surprised that I don't have them
both working.  I will work on that.

I am getting False for this variable: slycot.__SLYCOT_SETUP__

--
Dr. Ryan Krauss
Associate Professor
Product Design and Manufacturing Engineering
Grand Valley State University


On Fri, Aug 30, 2019 at 2:16 AM Murray, Richard M. <mu...@cd...>
wrote:

> Which version of python-control and slycot?  I just ran against the latest
> master and slycot 0.3.4 and it didn’t generate an error.
>
> -richard
>
> > On 29 Aug 2019, at 11:04 , Ryan Krauss <kra...@gv...> wrote:
> >
> > I am trying to do a super basic step response for a first order TF and
> am getting an error I have never seen before.  The notebook is attached,
> but here is the code and the error message:
> >
> > %matplotlib inline
> > import matplotlib.pyplot as plt
> > import numpy as np
> > import control
> > from numpy import sin, cos, tan, pi
> > from control import TransferFunction as TF
> >
> > p = 30
> >
> > G = control.TransferFunction(p,[1,p])
> > G
> >
> > control.step_response(G)
> >
> >
> ---------------------------------------------------------------------------
> > ValueError
> >                                 Traceback (most recent call last)
> >
> > <ipython-input-7-7235fbf92fdd> in <module>()
> > ----> 1 control.step_response(G)
> >
> >
> >
> > /usr/local/lib/python3.6/site-packages/control/timeresp.py in
> step_response(sys, T, X0, input, output, transpose, return_x)
> >     450     >>> T, yout = step_response(sys, T, X0)
> >     451
> >      """
> >
> > --> 452     sys = _get_ss_simo(sys, input, output)
> >     453     if T is None:
> >     454         if isctime(sys):
> >
> >
> >
> > /usr/local/lib/python3.6/site-packages/control/timeresp.py in
> _get_ss_simo(sys, input, output)
> >     378     If input is not specified, select first input and
> >  issue warning
> >
> >     379
> >      """
> >
> > --> 380     sys_ss = _convertToStateSpace(sys)
> >     381     if sys_ss.issiso():
> >     382         return
> >  sys_ss
> >
> >
> > /usr/local/lib/python3.6/site-packages/control/statesp.py in
> _convertToStateSpace(sys, **kw)
> >     895             # transfer function to state space conversion now
> should work!
> >     896
> >              ssout = td04ad('C', sys.inputs, sys.outputs,
> >
> > --> 897
> >                             denorder, den, num, tol=0)
> >
> >     898
> >
> >
> >     899             states = ssout[0]
> >
> >
> >
> > /usr/local/lib/python3.6/site-packages/slycot/transform.py in
> td04ad(rowcol, m, p, index, dcoeff, ucoeff, tol, ldwork)
> >     446         e = ValueError(error_text)
> >     447         e.info = out[-1]
> > --> 448         raise
> >  e
> >
> >     449     if out[-1] > 0:
> >     450         error_text = "The leading coefficient of a denominator
> polynomial is nearly zero; calculations would overflow; no state-space
> representation was calculated.
> ABS(DCOEFF("+str(out[-1])+",1))="+str(abs(dcoeff(out[-1],1)))+" is too
> small."
> >
> >
> >
> > ValueError: The following argument had an illegal value: dcoeff
> >
> > --
> > Dr. Ryan Krauss
> > Associate Professor
> > Product Design and Manufacturing Engineering
> > Grand Valley State University
> > <illegeal_dcoeff.ipynb>_______________________________________________
> > python-control-discuss mailing list
> > pyt...@li...
> > https://lists.sourceforge.net/lists/listinfo/python-control-discuss
>
>
> _______________________________________________
> python-control-discuss mailing list
> pyt...@li...
> https://lists.sourceforge.net/lists/listinfo/python-control-discuss
>

Re: [python-control-discuss] really weird error for SISO step response

[Ryan K. <kra...@gv...>]

I guess I have to upgrade to OSX 10.14 to get xcode back......

This could take a minute.....

--
Dr. Ryan Krauss
Associate Professor
Product Design and Manufacturing Engineering
Grand Valley State University


On Fri, Aug 30, 2019 at 11:26 AM Ryan Krauss <kra...@gv...> wrote:

> I just ran a pip upgrade for the control module.  I am running 0.8.2.
>
> I just tried upgrading slycot via pip.  pip says I am currently running
> 0.3.0.  I tried to upgrade to 0.3.5 via pip, but I receive error messages
> about gfortran and xcode.  I am kind of surprised that I don't have them
> both working.  I will work on that.
>
> I am getting False for this variable: slycot.__SLYCOT_SETUP__
>
> --
> Dr. Ryan Krauss
> Associate Professor
> Product Design and Manufacturing Engineering
> Grand Valley State University
>
>
> On Fri, Aug 30, 2019 at 2:16 AM Murray, Richard M. <mu...@cd...>
> wrote:
>
>> Which version of python-control and slycot?  I just ran against the
>> latest master and slycot 0.3.4 and it didn’t generate an error.
>>
>> -richard
>>
>> > On 29 Aug 2019, at 11:04 , Ryan Krauss <kra...@gv...> wrote:
>> >
>> > I am trying to do a super basic step response for a first order TF and
>> am getting an error I have never seen before.  The notebook is attached,
>> but here is the code and the error message:
>> >
>> > %matplotlib inline
>> > import matplotlib.pyplot as plt
>> > import numpy as np
>> > import control
>> > from numpy import sin, cos, tan, pi
>> > from control import TransferFunction as TF
>> >
>> > p = 30
>> >
>> > G = control.TransferFunction(p,[1,p])
>> > G
>> >
>> > control.step_response(G)
>> >
>> >
>> ---------------------------------------------------------------------------
>> > ValueError
>> >                                 Traceback (most recent call last)
>> >
>> > <ipython-input-7-7235fbf92fdd> in <module>()
>> > ----> 1 control.step_response(G)
>> >
>> >
>> >
>> > /usr/local/lib/python3.6/site-packages/control/timeresp.py in
>> step_response(sys, T, X0, input, output, transpose, return_x)
>> >     450     >>> T, yout = step_response(sys, T, X0)
>> >     451
>> >      """
>> >
>> > --> 452     sys = _get_ss_simo(sys, input, output)
>> >     453     if T is None:
>> >     454         if isctime(sys):
>> >
>> >
>> >
>> > /usr/local/lib/python3.6/site-packages/control/timeresp.py in
>> _get_ss_simo(sys, input, output)
>> >     378     If input is not specified, select first input and
>> >  issue warning
>> >
>> >     379
>> >      """
>> >
>> > --> 380     sys_ss = _convertToStateSpace(sys)
>> >     381     if sys_ss.issiso():
>> >     382         return
>> >  sys_ss
>> >
>> >
>> > /usr/local/lib/python3.6/site-packages/control/statesp.py in
>> _convertToStateSpace(sys, **kw)
>> >     895             # transfer function to state space conversion now
>> should work!
>> >     896
>> >              ssout = td04ad('C', sys.inputs, sys.outputs,
>> >
>> > --> 897
>> >                             denorder, den, num, tol=0)
>> >
>> >     898
>> >
>> >
>> >     899             states = ssout[0]
>> >
>> >
>> >
>> > /usr/local/lib/python3.6/site-packages/slycot/transform.py in
>> td04ad(rowcol, m, p, index, dcoeff, ucoeff, tol, ldwork)
>> >     446         e = ValueError(error_text)
>> >     447         e.info = out[-1]
>> > --> 448         raise
>> >  e
>> >
>> >     449     if out[-1] > 0:
>> >     450         error_text = "The leading coefficient of a denominator
>> polynomial is nearly zero; calculations would overflow; no state-space
>> representation was calculated.
>> ABS(DCOEFF("+str(out[-1])+",1))="+str(abs(dcoeff(out[-1],1)))+" is too
>> small."
>> >
>> >
>> >
>> > ValueError: The following argument had an illegal value: dcoeff
>> >
>> > --
>> > Dr. Ryan Krauss
>> > Associate Professor
>> > Product Design and Manufacturing Engineering
>> > Grand Valley State University
>> > <illegeal_dcoeff.ipynb>_______________________________________________
>> > python-control-discuss mailing list
>> > pyt...@li...
>> > https://lists.sourceforge.net/lists/listinfo/python-control-discuss
>>
>>
>> _______________________________________________
>> python-control-discuss mailing list
>> pyt...@li...
>> https://lists.sourceforge.net/lists/listinfo/python-control-discuss
>>
>

Re: [python-control-discuss] really weird error for SISO step response

[Ryan K. <kra...@gv...>]

Good times.  I have updated to 10.14.6.  I have 39GB of free hard drive
space.  But apparently this isn't enough to install xcode..............

--
Dr. Ryan Krauss
Associate Professor
Product Design and Manufacturing Engineering
Grand Valley State University


On Fri, Aug 30, 2019 at 11:27 AM Ryan Krauss <kra...@gv...> wrote:

> I guess I have to upgrade to OSX 10.14 to get xcode back......
>
> This could take a minute.....
>
> --
> Dr. Ryan Krauss
> Associate Professor
> Product Design and Manufacturing Engineering
> Grand Valley State University
>
>
> On Fri, Aug 30, 2019 at 11:26 AM Ryan Krauss <kra...@gv...> wrote:
>
>> I just ran a pip upgrade for the control module.  I am running 0.8.2.
>>
>> I just tried upgrading slycot via pip.  pip says I am currently running
>> 0.3.0.  I tried to upgrade to 0.3.5 via pip, but I receive error messages
>> about gfortran and xcode.  I am kind of surprised that I don't have them
>> both working.  I will work on that.
>>
>> I am getting False for this variable: slycot.__SLYCOT_SETUP__
>>
>> --
>> Dr. Ryan Krauss
>> Associate Professor
>> Product Design and Manufacturing Engineering
>> Grand Valley State University
>>
>>
>> On Fri, Aug 30, 2019 at 2:16 AM Murray, Richard M. <
>> mu...@cd...> wrote:
>>
>>> Which version of python-control and slycot?  I just ran against the
>>> latest master and slycot 0.3.4 and it didn’t generate an error.
>>>
>>> -richard
>>>
>>> > On 29 Aug 2019, at 11:04 , Ryan Krauss <kra...@gv...> wrote:
>>> >
>>> > I am trying to do a super basic step response for a first order TF and
>>> am getting an error I have never seen before.  The notebook is attached,
>>> but here is the code and the error message:
>>> >
>>> > %matplotlib inline
>>> > import matplotlib.pyplot as plt
>>> > import numpy as np
>>> > import control
>>> > from numpy import sin, cos, tan, pi
>>> > from control import TransferFunction as TF
>>> >
>>> > p = 30
>>> >
>>> > G = control.TransferFunction(p,[1,p])
>>> > G
>>> >
>>> > control.step_response(G)
>>> >
>>> >
>>> ---------------------------------------------------------------------------
>>> > ValueError
>>> >                                 Traceback (most recent call last)
>>> >
>>> > <ipython-input-7-7235fbf92fdd> in <module>()
>>> > ----> 1 control.step_response(G)
>>> >
>>> >
>>> >
>>> > /usr/local/lib/python3.6/site-packages/control/timeresp.py in
>>> step_response(sys, T, X0, input, output, transpose, return_x)
>>> >     450     >>> T, yout = step_response(sys, T, X0)
>>> >     451
>>> >      """
>>> >
>>> > --> 452     sys = _get_ss_simo(sys, input, output)
>>> >     453     if T is None:
>>> >     454         if isctime(sys):
>>> >
>>> >
>>> >
>>> > /usr/local/lib/python3.6/site-packages/control/timeresp.py in
>>> _get_ss_simo(sys, input, output)
>>> >     378     If input is not specified, select first input and
>>> >  issue warning
>>> >
>>> >     379
>>> >      """
>>> >
>>> > --> 380     sys_ss = _convertToStateSpace(sys)
>>> >     381     if sys_ss.issiso():
>>> >     382         return
>>> >  sys_ss
>>> >
>>> >
>>> > /usr/local/lib/python3.6/site-packages/control/statesp.py in
>>> _convertToStateSpace(sys, **kw)
>>> >     895             # transfer function to state space conversion now
>>> should work!
>>> >     896
>>> >              ssout = td04ad('C', sys.inputs, sys.outputs,
>>> >
>>> > --> 897
>>> >                             denorder, den, num, tol=0)
>>> >
>>> >     898
>>> >
>>> >
>>> >     899             states = ssout[0]
>>> >
>>> >
>>> >
>>> > /usr/local/lib/python3.6/site-packages/slycot/transform.py in
>>> td04ad(rowcol, m, p, index, dcoeff, ucoeff, tol, ldwork)
>>> >     446         e = ValueError(error_text)
>>> >     447         e.info = out[-1]
>>> > --> 448         raise
>>> >  e
>>> >
>>> >     449     if out[-1] > 0:
>>> >     450         error_text = "The leading coefficient of a denominator
>>> polynomial is nearly zero; calculations would overflow; no state-space
>>> representation was calculated.
>>> ABS(DCOEFF("+str(out[-1])+",1))="+str(abs(dcoeff(out[-1],1)))+" is too
>>> small."
>>> >
>>> >
>>> >
>>> > ValueError: The following argument had an illegal value: dcoeff
>>> >
>>> > --
>>> > Dr. Ryan Krauss
>>> > Associate Professor
>>> > Product Design and Manufacturing Engineering
>>> > Grand Valley State University
>>> > <illegeal_dcoeff.ipynb>_______________________________________________
>>> > python-control-discuss mailing list
>>> > pyt...@li...
>>> > https://lists.sourceforge.net/lists/listinfo/python-control-discuss
>>>
>>>
>>> _______________________________________________
>>> python-control-discuss mailing list
>>> pyt...@li...
>>> https://lists.sourceforge.net/lists/listinfo/python-control-discuss
>>>
>>

Re: [python-control-discuss] really weird error for SISO step response

[Ryan K. <kra...@gv...>]

OK, my problem seems to be fixed.  Documenting my fix here in case this
helps someone in the future:

- upgraded to Mac OSX 10.14, then again to 10.14.6
    - I was doing this to install xcode, which I still have not been able
to do because of disk space
- manually downloaded the commandline tools for xcode and installed it
- updated gcc via homebrew
    - this seems to have fixed an error from pip regarding gfortran
- updated slycot via pip:
Successfully installed slycot-0.3.5

Everything is now happy and I can evaluate the step response of an RC
filter....

--
Dr. Ryan Krauss
Associate Professor
Product Design and Manufacturing Engineering
Grand Valley State University


On Fri, Aug 30, 2019 at 6:21 PM Ryan Krauss <kra...@gv...> wrote:

> Good times.  I have updated to 10.14.6.  I have 39GB of free hard drive
> space.  But apparently this isn't enough to install xcode..............
>
> --
> Dr. Ryan Krauss
> Associate Professor
> Product Design and Manufacturing Engineering
> Grand Valley State University
>
>
> On Fri, Aug 30, 2019 at 11:27 AM Ryan Krauss <kra...@gv...> wrote:
>
>> I guess I have to upgrade to OSX 10.14 to get xcode back......
>>
>> This could take a minute.....
>>
>> --
>> Dr. Ryan Krauss
>> Associate Professor
>> Product Design and Manufacturing Engineering
>> Grand Valley State University
>>
>>
>> On Fri, Aug 30, 2019 at 11:26 AM Ryan Krauss <kra...@gv...> wrote:
>>
>>> I just ran a pip upgrade for the control module.  I am running 0.8.2.
>>>
>>> I just tried upgrading slycot via pip.  pip says I am currently running
>>> 0.3.0.  I tried to upgrade to 0.3.5 via pip, but I receive error messages
>>> about gfortran and xcode.  I am kind of surprised that I don't have them
>>> both working.  I will work on that.
>>>
>>> I am getting False for this variable: slycot.__SLYCOT_SETUP__
>>>
>>> --
>>> Dr. Ryan Krauss
>>> Associate Professor
>>> Product Design and Manufacturing Engineering
>>> Grand Valley State University
>>>
>>>
>>> On Fri, Aug 30, 2019 at 2:16 AM Murray, Richard M. <
>>> mu...@cd...> wrote:
>>>
>>>> Which version of python-control and slycot?  I just ran against the
>>>> latest master and slycot 0.3.4 and it didn’t generate an error.
>>>>
>>>> -richard
>>>>
>>>> > On 29 Aug 2019, at 11:04 , Ryan Krauss <kra...@gv...> wrote:
>>>> >
>>>> > I am trying to do a super basic step response for a first order TF
>>>> and am getting an error I have never seen before.  The notebook is
>>>> attached, but here is the code and the error message:
>>>> >
>>>> > %matplotlib inline
>>>> > import matplotlib.pyplot as plt
>>>> > import numpy as np
>>>> > import control
>>>> > from numpy import sin, cos, tan, pi
>>>> > from control import TransferFunction as TF
>>>> >
>>>> > p = 30
>>>> >
>>>> > G = control.TransferFunction(p,[1,p])
>>>> > G
>>>> >
>>>> > control.step_response(G)
>>>> >
>>>> >
>>>> ---------------------------------------------------------------------------
>>>> > ValueError
>>>> >                                 Traceback (most recent call last)
>>>> >
>>>> > <ipython-input-7-7235fbf92fdd> in <module>()
>>>> > ----> 1 control.step_response(G)
>>>> >
>>>> >
>>>> >
>>>> > /usr/local/lib/python3.6/site-packages/control/timeresp.py in
>>>> step_response(sys, T, X0, input, output, transpose, return_x)
>>>> >     450     >>> T, yout = step_response(sys, T, X0)
>>>> >     451
>>>> >      """
>>>> >
>>>> > --> 452     sys = _get_ss_simo(sys, input, output)
>>>> >     453     if T is None:
>>>> >     454         if isctime(sys):
>>>> >
>>>> >
>>>> >
>>>> > /usr/local/lib/python3.6/site-packages/control/timeresp.py in
>>>> _get_ss_simo(sys, input, output)
>>>> >     378     If input is not specified, select first input and
>>>> >  issue warning
>>>> >
>>>> >     379
>>>> >      """
>>>> >
>>>> > --> 380     sys_ss = _convertToStateSpace(sys)
>>>> >     381     if sys_ss.issiso():
>>>> >     382         return
>>>> >  sys_ss
>>>> >
>>>> >
>>>> > /usr/local/lib/python3.6/site-packages/control/statesp.py in
>>>> _convertToStateSpace(sys, **kw)
>>>> >     895             # transfer function to state space conversion now
>>>> should work!
>>>> >     896
>>>> >              ssout = td04ad('C', sys.inputs, sys.outputs,
>>>> >
>>>> > --> 897
>>>> >                             denorder, den, num, tol=0)
>>>> >
>>>> >     898
>>>> >
>>>> >
>>>> >     899             states = ssout[0]
>>>> >
>>>> >
>>>> >
>>>> > /usr/local/lib/python3.6/site-packages/slycot/transform.py in
>>>> td04ad(rowcol, m, p, index, dcoeff, ucoeff, tol, ldwork)
>>>> >     446         e = ValueError(error_text)
>>>> >     447         e.info = out[-1]
>>>> > --> 448         raise
>>>> >  e
>>>> >
>>>> >     449     if out[-1] > 0:
>>>> >     450         error_text = "The leading coefficient of a
>>>> denominator polynomial is nearly zero; calculations would overflow; no
>>>> state-space representation was calculated.
>>>> ABS(DCOEFF("+str(out[-1])+",1))="+str(abs(dcoeff(out[-1],1)))+" is too
>>>> small."
>>>> >
>>>> >
>>>> >
>>>> > ValueError: The following argument had an illegal value: dcoeff
>>>> >
>>>> > --
>>>> > Dr. Ryan Krauss
>>>> > Associate Professor
>>>> > Product Design and Manufacturing Engineering
>>>> > Grand Valley State University
>>>> > <illegeal_dcoeff.ipynb>_______________________________________________
>>>> > python-control-discuss mailing list
>>>> > pyt...@li...
>>>> > https://lists.sourceforge.net/lists/listinfo/python-control-discuss
>>>>
>>>>
>>>> _______________________________________________
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>>>>
>>>