Enhanced Laplace transforms and desolve for Maxima
Subject: Enhanced Laplace transforms and desolve for Maxima
From: Barton Willis
Date: Mon, 24 Jan 2011 14:49:44 -0600
Mark H Weaver <mhw at netris.org> wrote on 01/24/2011 12:18:36 PM:
> > My preference would be to *delete* the function unit_step_mult_simp
> > from abs_integrate.
>
> Agreed. I will rewrite the new version in lisp, and make it part of the
> new step function code I'm working on.
Super--the next time I do abs_integrate maintenance, I'll delete
unit_step_mult_simp.
> I'm not sure what you mean by "derivative divides integration for
> hstep". Do you mean cases where you can change the variable of
> integration, e.g. u=hstep(x)?
Derivative divides integration is also known as integration by
subsitution:
integrate(2 * x * f(x^2),x) --> subst(z = x^2, integrate(f(z),z)) --> ...
There is a symbol property mechanism (I think) for telling Maxima
the antiderivative of a function.
If I were to declare a do-over for abs_integrate, maybe I'd convert signum
&
friends to conditionals and then integrate the conditionals.
Thanks,
--bw