I did not see that this thread was continued under a different
subject. Yes, unfortunately, there are currently a lot of bugs related
to pickling and unpickling SymPy expressions. We need to make a
concerted effort to iron them all out. I would also suggest using
cloudpickle, as it works better
On Wed, 7 Apr 2021 at 14:55, Oscar Benjamin wrote:
>
> On Wed, 7 Apr 2021 at 14:43, 'Bruce Allen' via sympy
> wrote:
> >
> > David, Oscar,
> >
> > Thank you for your help.
> >
> > Oscar, the list 'u' was created in the course of a calculation, and
> > saved as a .pkl file. I then reloaded it and
On 07/04/2021 15:27, 'Bruce Allen' via sympy wrote:
Dear Oscar,
Thank you.
On the upside, this shows that sympy has a robust user base -- the bug
was picked up just 20 days ago and here I am stumbling on it
independently.
On the downside, this makes it hard to work on a calculation which
Assuming symbols with the same names but different assumptions are not
being used, couldn't one just "refresh" the unpickled expression by pairing
the pickled symbols with current session variables by name? Does this work?
unpickle = a # an expression that was unpickled
reps= {}
for i in
On Wed, 7 Apr 2021 at 15:27, 'Bruce Allen' via sympy
wrote:
>
> On the downside, this makes it hard to work on a calculation which
> requires large numbers of CPU hours and needs to be checkpointed and saved.
>
> Do you know of any workarounds? Or is there an alternative to
> pickle.save() and
Dear Oscar,
Thank you.
On the upside, this shows that sympy has a robust user base -- the bug
was picked up just 20 days ago and here I am stumbling on it independently.
On the downside, this makes it hard to work on a calculation which
requires large numbers of CPU hours and needs to be
On Wed, 7 Apr 2021 at 14:43, 'Bruce Allen' via sympy
wrote:
>
> David, Oscar,
>
> Thank you for your help.
>
> Oscar, the list 'u' was created in the course of a calculation, and
> saved as a .pkl file. I then reloaded it and want to manipulate the
> saved equations, of which u[7] is an example.
David, Oscar,
Thank you for your help.
Oscar, the list 'u' was created in the course of a calculation, and
saved as a .pkl file. I then reloaded it and want to manipulate the
saved equations, of which u[7] is an example. I found an even cleaner
example, see below.
I have the impression
On 07/04/2021 12:28, Oscar Benjamin wrote:
In Bruce's example both symbols seem to have the same assumptions so
this shouldn't be the issue.
Oscar
I just checked and you can make two non-identical symbols that way:
Symbol('a')+Symbol('a',Positive=True)
a + a
I almost wonder if that should
On Wed, 7 Apr 2021 at 12:24, David Bailey wrote:
>
> On 07/04/2021 11:59, Oscar Benjamin wrote:
> > On Wed, 7 Apr 2021 at 10:28, 'Bruce Allen' via sympy
> > wrote:
> >>
> >> Why does subs() work in one case, and not in the other?
> > I'm not sure. I can't reproduce this without u though. I tried
On 07/04/2021 11:59, Oscar Benjamin wrote:
On Wed, 7 Apr 2021 at 10:28, 'Bruce Allen' via sympy
wrote:
I have a very basic sympy question, which has me stumped, and am hoping
that someone here can set me straight. I have an expression for which
subs() seems to have no effect:
>>>
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