On Mon, Mar 19, 2018 at 08:32:23AM -0700, Nils Bruin wrote:
> On Monday, March 19, 2018 at 8:04:07 AM UTC-7, Emmanuel Charpentier wrote:
> >
> >
> >
> > - Some functions (mostly inherited from Maxima) *do* already create
> > new symbolic variables, but do not inject them in the relevant
> > namespace.
> > In *this* case (and this case only), I'd like to have this injection
> > done
> > by default, but controllable via an option. *Prima facie,* our targets
> > are solve and desolve + their friends. But I forget some other ones
> > almost
> > surely... Hints ?
> >
> > -2. This is only possible with very comprehensive hacks: the "interactive
> name-space" has no special status outside of IPython. The sage library
> wouldn't have an idea where to insert this stuff. We'd basically require a
> "scratchpad" onto which all code can scribble binding suggestions and then,
> once control comes back to IPython, a decision could be made on iwhether to
> nject these bindings.
>
> >
> > - %(%)auto_constants : control whether Maxima-generated constants are
> > injected in the relevant namespace. Default : True.
> >
> > -2 for the default; -1 in general. There's no trigger event in maxima to
> make these bindings. If you take the sage-maxima interface (which would see
> symbols from maxima it hasn't seen before), you could use that as a
> trigger, but then the behaviour of the interface relies on lifetime
> history! (and the fact that the sage-maxima interface is a memory leak for
> its translation dictionary).
>
> These things happen more often:
>
> sage: matrix(2,2,[1,2,3,4]).charpoly()
> x^2 - 5*x - 2
>
> creates a polynomial over ZZ. Should IPython rebind x to ZZ['x'].gen() ?
> Only when x is unbound? More generally:
>
> sage: QQ['y','z']
> Multivariate Polynomial Ring in y, z over Rational Field
>
> should that trigger y and z being bound?
In the same vein, what about:
- d+e ?
- i+j ?
- m+n ?
- r+s ?
Shall the Euler constant, the imaginary number, the numerical
approximation and the R interpreter be locally diabled ? What about
2*i*pi*j ?
What if some user use the automatic name "plop" in her worksheet and in a
later version Sage adds "plop" into the global namspace ?
Such features might look impressive for the 5 first minutes one is using
Sage, but they are adding confusion and do not help understanding nor
teaching in the longer term ("var('y')" is another famous example).
Ciao,
Thierry
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