Yes, Robert eval is doing the rounding. How do I fix it?
On Sep 1, 12:31 pm, Mikie <thephantom6...@hotmail.com> wrote:
> I have tried SR. I get a malformed value. Yes, I understand the
> problem with eval. Do you have any suggestions on how to get the
> right value into maxima.solve?
>
> On Sep 1, 11:32 am, Robert Bradshaw <rober...@math.washington.edu>
> wrote:
>
>
>
> > On Tue, 1 Sep 2009, Mikie wrote:
>
> > > When I run the server with the function above and the following string
> > > from a text box I get
> > > [y=-1,x=0]. The string is "[3*x-y-1,x+(1/3)*y]"
>
> > > It is changing the input value to [3*x-y-1,x]
>
> > 1/3 = 0 in Python. Also, I hope you realize how dangerous
>
> > eval("random string someone gave you from the web") is!
>
> > - Robert
>
> > > On Sep 1, 10:38 am, Mikie <thephantom6...@hotmail.com> wrote:
> > >> Sorry, wrong function
>
> > >> def MSolveSys(syss):
> > >> eqns=eval(syss)
> > >> solns=maxima.solve(eqns)
> > >> return solns
>
> > >> On Sep 1, 10:31 am, Jason Grout <jason-s...@creativetrax.com> wrote:
>
> > >>> Robert Bradshaw wrote:
> > >>>> On Sep 1, 2009, at 9:17 AM, Mikie wrote:
>
> > >>>>> Here is function I am using to solve systems of linear equations.
>
> > >>>>> def MSolveSys(syss):
> > >>>>> eqns=eval(syss)
> > >>>>> solns=maxima.solve(syss)
> > >>>>> return solns
>
> > >>>>> Works great in the notebook, but when I put it in a Python script it
> > >>>>> rounds the coeficients of the variables and thus produces bad
> > >>>>> solutions.
>
> > >>>> Perhaps eval here is the culprit. You might have to parse it a bit
> > >>>> yourself. SR("...") will parse expressions.
>
> > >>> Mikie effectively isn't using "eval", right? That line (and the "eqns"
> > >>> variable) is not being used.
>
> > >>> Jason
>
> > >>> --
> > >>> Jason Grout- Hide quoted text -
>
> > >>> - Show quoted text -- Hide quoted text -
>
> > >> - Show quoted text -- Hide quoted text -
>
> > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -
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