Re: [python-control-announce] Control/slycot with Python 3.6

[Richard M. <mu...@cd...>]

We haven’t yet tested the python-control package using Python 3.6, so there are no pre-compiled versions of the slycot or controls packages on the conda server, which is what I think is causing the problem.

I did a clean python3.6 installation using conda to see if things work.  It looks like I get numpy 1.12 (instead of 1.9) and so maybe also be part of the problem in the errors below.  However, moving past that problem I get the following error:

> (py36test) bash-3.2$ conda install -c python-control -c cyclus slycot control
> Fetching package metadata ...........
> Solving package specifications: ....
> 
> 
> UnsatisfiableError: The following specifications were found to be in conflict:
>   - python 3.6*
>   - slycot

As mentioned, this is because slycot (and python-control) haven’t yet been compiled for Python 3.6 => they are not on the conda server.

A couple of options:

* Use Python 3.5

* Install slycot and control using pip (I just tried it and that works).  This requires that you have a FORTRAN compiler.

* If you don’t have a FORTRAN compiler, some parts of python-control will work without slycot.  You still need to use pip to install the control package, though.

Hope that helps.

-richard

> On Apr 9, 2017, at 05:17, Vincent R. <vor...@ya...> wrote:
> 
> Hello,
> 
> I'm tying to install the Python Control System Library, to test it as a matlab replacement for my students.
> I use Linux, and the Anaconda distribution : python 3.6 for a 64bit system.
> When i try to install control following instructions on the website, i get this error message :
>  ~/anaconda3/bin $ ./conda install -c python-control -c cyclus slycot control
> Fetching package metadata .............
> Solving package specifications: .
> 
> UnsatisfiableError: The following specifications were found to be in conflict:
>   - control -> numpy 1.9* -> python 2.6* -> openssl 1.0.1*
>   - python 3.6*
> Use "conda info <package>" to see the dependencies for each package.
> 
> Do have i to wait for a new version of the package, or do you know of a workaround ?
> 
> Thanks
> V.R.
> 
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