On Wed, Feb 4, 2009 at 4:27 PM, Friedrich Hagedorn <friedric...@gmx.de>wrote:
>
> On Wed, Feb 04, 2009 at 07:12:54AM -0800, chu-ching huang wrote:
> >
> > Hi,
> >
> > Maybe this had been discussed:
> >
> > how to define a sequence of variables (by symbols), {x_1,x_2,---,x_n}
> > in case n is also a variable?
>
> Do you want this:
>
> In [1]: var('x_1 x_2 x_n')
> Out[1]: (x_1, x_2, x_n)
>
> In [2]: x_1 + x_2 + x_n
> Out[2]: x_1 + x_2 + x_n
You can also use DeferredVector:
In [1]: a = DeferredVector('a')
In [2]: a[1] + a[2] + a[3] + a[4] + a[54653656]
Out[2]: a[1] + a[2] + a[3] + a[4] + a[54653656]
just that the class lacks documentation, see
http://code.google.com/p/sympy/issues/detail?id=1268
>
>
>
> By,
>
> Friedrich
>
> >
>
--
Fabian, http://fseoane.net/blog/
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