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 <[email protected]> wrote:
>> Sorry, wrong function
>>
>> def MSolveSys(syss):
>> eqns=eval(syss)
>> solns=maxima.solve(eqns)
>> return solns
>>
>> On Sep 1, 10:31 am, Jason Grout <[email protected]> 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 -
> >
>
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