On Aug 5, 8:41 am, Jose Guzman <[email protected]> wrote:
> In either case, Sage returns the same error:
> TypeError: unable to make sense of Maxima expression
> 'v(t)=-e^-(t*gL/cm)*(at(integrate((EL*gL+signum(t-5)-signum(t-13))*e^(t*gL/cm),t),[t=0,v(t)=-65])-integrate((EL*gL+signum(t-5)-signum(t-13))*e^(t*gL/cm),t)+65*cm)/cm'
> in Sage
That seems a bug to me. It is probably because maxima's "at" function
has not been translated yet. This should not be hard to fix. In Sage,
similar functionality is available in the form of "substitute" and
"call". Here is a more direct way of arriving at a similar error
(requires 4.7.1 for interfacing with the LISP below, but that should
not be essential for exposing the problem):
sage: M=sage.calculus.calculus.maxima
sage: E=sage.libs.ecl.ecl_eval
sage: expr=E("#$at(derivative(f(x),x),[x=0])$")
sage: M(expr)
?%at('diff(f(x),x,1),[x=0])
sage: M(expr).sage()
[...]
TypeError: unable to make sense of Maxima expression 'at(diff(f(x),x,
1),[x=0])' in Sage
You can help sage by filing a bug report.
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