I realise that I have to give that more thought. Thanks for getting me
on track.
On Feb 8, 5:58 pm, Chris Smith <smi...@gmail.com> wrote:
> On Wed, Feb 8, 2012 at 4:43 PM, janwillem <jwevand...@xs4all.nl> wrote:
> > Thanks Chris, I must confess I overlooked sympyfy, however, there is a
> > problem with symbols not being defined as is the case when using multi
> > char names like in the below version. If resp is not defined the diff
> > complains. What I need is that the student just enters a formula and
> > is not bothered with defining the symbols. Any additional
> > possibilities?
> > import sympy
> > s = '(signal - 1.01 * blank) / resp'
> > y = sympy.sympify(s)
> > print y
> > #only works when symbol resp is defined
> > resp = sympy.Symbol('resp')
> > dydresp = y.diff(resp)
> > print dydresp
>
> Does the student need access to the variables or is the program going
> to compute a derivative? And if the latter, how do you decide which
> one it will be?
>
> /c
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