So true. I deleted my post soon after I posted it, in case anyone took it
seriously. But it was intended as a cosmetic work-around. I presume a
var('a', commutative=True) immediately after would remedy that.
On Sunday, April 24, 2022 at 5:01:49 AM UTC+1 asme...@gmail.com wrote:
> I would only do that just for the printing. Telling SymPy that two
> symbols don't commute means that it will no longer do any
> simplifications on it that aren't valid without commuting them.
>
> Aaron Meurer
>
> On Sat, Apr 23, 2022 at 3:32 AM Andre Bolle <andre...@gmail.com> wrote:
> >
> > You can always tell Sympy that as far as I am concerned "a" is
> non-commutative. Then tradition is preserved.
> >
> > >>> var('F m')
> > (F, m)
> > >>> var('a')
> > a
> > >>> print(Eq(F,m*a))
> > Eq(F, a*m)
> > >>> var('a', commutative=False)
> > a
> > >>> print(Eq(F,m*a))
> > Eq(F, m*a)
> > On Thursday, April 21, 2022 at 8:23:51 PM UTC+1 Andre Bolle wrote:
> >>
> >> I think mathematicians prefer the order of symbols preserved.
> >>
> >> On Thursday, April 21, 2022 at 7:54:20 PM UTC+1 asme...@gmail.com
> wrote:
> >>>
> >>> On Thu, Apr 21, 2022 at 12:16 PM Oscar Benjamin
> >>> <oscar.j....@gmail.com> wrote:
> >>> >
> >>> > On Thu, 21 Apr 2022 at 18:53, Aaron Meurer <asme...@gmail.com>
> wrote:
> >>> > >
> >>> > > If you want the expression to print in the same way that it was
> >>> > > originally entered, then it needs to keep track of that information
> >>> > > when it is created. That's not something that currently happens.
> >>> > >
> >>> > > If you just want the printers to have more options in how they sort
> >>> > > things, that is technically already possible, although it's not
> >>> > > particularly straightforward and not very well documented.
> >>> >
> >>> > It should be easier to do each of these things. At the moment you can
> >>> > create an Add(y, x, evaluate=False) and the printers do have an
> >>> > "order" setting (for init_printing) but there isn't a value for the
> >>> > order parameter that just prints the terms in the exact order that
> >>> > they appear in the Add.
> >>> >
> >>> > This is a very commonly requested option on StackOverflow etc. It
> >>> > would be good to fix it so that the printers can just print in args
> >>> > order.
> >>>
> >>> The order flag needs to be documented much better. Also I think it
> >>> would be useful if you could just pass a sort key function directly to
> >>> the printer, with some examples of how to do that.
> >>>
> >>> Aaron Meurer
> >>>
> >>> >
> >>> > --
> >>> > Oscar
> >>> >
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