Le dimanche 26 avril 2015 21:03:02 UTC+2, Aaron Meurer a écrit :
>
> On Sun, Apr 26, 2015 at 12:27 AM, Loïc Gouarin <[email protected]
> <javascript:>> wrote:
> > Hi,
> >
> > I would like to parse a string expression like that
> >
> > from sympy.parsing.sympy_parser import parse_expr
> > parse_expr("m[0][0]")
> >
> > But I have an error with 'Symbol' object does not support indexing.
> >
> > If I do
> >
> > sympy.Symbol("m[0][0]")
> >
> > everything is ok.
> >
> > I try to write my own transformation funtion that takes the "m[x][y]"
> and
> > creates a Symbol and add it to the standard_transformations in
> parse_expr
> > but the problem is still the same because the problem is in auto_symbol
> and
> > it parses again my string 'm[x][y]'.
>
> Does it work if you transform it literally to sympy.Symbol("m[0][0]")?
>
> Hi Aaron,
your solution is almost what I want. There is no error in the parse_exp but
I have in the result Symbol("m[x][y]") and not m[x][y]. I know thatit is
the same but I parse again the result and I need m[x][y].
Is there an easy way to have on the ouput m[x][y] and not Symbol("m[x][y]")
?
Thanks,
Loic
Aaron Meurer
>
> >
> > Could you tell me how I can do that ?
> >
> > Thanks,
> > Loic
> >
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