On May 9, 2007, at 10:51 AM, Timothy Clemans wrote:
> The calculus package fails on all of the following general forms. I
> used sagenb.com and a clean worksheet.
I'm not sure these are failures, per se. This may be a in issue with
the Principal of Least Surprise :-}
>
> {{{
> diff(c)
> ///
> 1
> }}}
'c' is a symbolic variable (new with 2.5), so differentiating it as
above (implicitly, w.r.to 'c') gives '1'.
> {{{
> diff(c*f(x))
> ///
I think this fails because you have an expression using two variables
(c, x), but don't specify whether to compute "d/dx" or "d/dc". For
example,
{{{
diff(x*y)
}}}
fails, while
{{{
diff(x*y,x)
///
y
}}}
which is stated in the traceback:
> line 1062, in derivative
> "expression containing more than one variable"
> ValueError: must supply an explicit variable for an expression
> containing more than one variable
> }}}
I'm not sure what is going on in the rest of your examples, since f
and g aren't defined (for us). If I do define them, the other
operations in your message do seem to work (as far as I've tried them).
A last example:
{{{
diff (x^n,x)
///
n*x^(n - 1)
}}}
Justin
--
Justin C. Walker, Curmudgeon-At-Large
Director
Institute for the Enhancement of the Director's Income
--------
"Weaseling out of things is what separates us from the animals.
Well, except the weasel."
- Homer J Simpson
--------
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