Le lundi 25 novembre 2013 01:02:39 UTC+1, Volker Braun a écrit :
>
>
> Note that there is no need to repeat the 'x, y' labels here if you adjust
> the argspec for U.chart a bit. The point of the R.<x> syntax is that the
> coordinate names are supplied as strings as well as assigned to variables:
>
> sage: preparse("stereoN.<x,y> = U.chart('stereoN')")
> "stereoN = U.chart('stereoN', names=('x', 'y',)); (x, y,) =
> stereoN._first_ngens(2)"
>
>
>
Yes, indeed ! Actually, we maintained the coordinate string in the chart()
arguments because, in more general cases, it was our way to pass also the
coordinate ranges (by default (-oo,+oo)) and the LaTeX symbols of the
coordinates. For instance, we can have:
sage: polar.<th,ph> = U.chart(r'th:(0,pi):\theta ph:(0,2*pi):\phi', 'polar')
Using the full power of <> syntax as you suggest, we could modify this to
sage: polar.<th,ph> = U.chart('polar', ranges=[(0,pi), (0,2*pi)],
latex_symbols=r'\theta \phi')
The question is then: which of the two writings is the more user friendly ?
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