On Monday, May 21, 2012 3:12:13 PM UTC+8, Robert wrote:
>
> On both my own copy of sage (v 4.6) and on
sagenb.org
(v 4.8), executing
>
> R = QQ['a']['x']
> R('a')
>
> returns 'a' as an element of R, but executing
>
> R = QQ['a']['x,y']
> R('a')
>
> throws "TypeError: unable to convert string" (full traceback below). Is
> this how it's supposed to work?
>
> Traceback (most recent call last):
>
> File "<stdin>", line 1, in <module>
> File "_sage_input_3.py", line 10, in <module>
> exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
> -*-\\n" +
> _support_.preparse_worksheet_cell(base64.b64decode("QSA9IFFRWydhJ10KQiA9IEFbJ3gseSddCkIoJ2EnKQ=="),globals())+"\\n");
> execfile(os.path.abspath("___code___.py"))
> File "", line 1, in <module>
>
> File "/tmp/tmpRxt973/___code___.py", line 4, in <module>
> exec compile(u"B('a')" + '\n', '', 'single')
> File "", line 1, in <module>
>
> File
> "/sagenb/sage_install/sage-4.8-sage.math.washington.edu-x86_64-Linux/local/lib/python2.6/site-packages/sage/rings/polynomial/multi_polynomial_ring.py",
> line 459, in __call__
> raise TypeError, "unable to convert string"
> TypeError: unable to convert string
>
>
>
If you want the variables you can do R.gens(). If you want the generators
for the base ring then, R.base_ring().gens() will return you a.
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